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Journal Cover Modern Physics Letters B
  [SJR: 0.32]   [H-I: 29]   [1 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0217-9849 - ISSN (Online) 1793-6640
   Published by World Scientific Homepage  [118 journals]
  • Some possible [math]-exponential type probability distribution in the
           non-extensive statistical physics
    • Authors: Won Sang Chung
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, we present two exponential type probability distributions which are different from Tsallis’s case which we call Type I: one given by [math] (Type IIA) and another given by [math] (Type IIIA). Starting with the Boltzman–Gibbs entropy, we obtain the different probability distribution by using the Kolmogorov–Nagumo average for the microstate energies. We present the first-order differential equations related to Types I, II and III. For three types of probability distributions, we discuss the quantum harmonic oscillator, two-level problem and the spin-[math] paramagnet.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-18T04:09:56Z
      DOI: 10.1142/S0217984916502523
       
  • Single-mode cylindrical graphene plasmon waveguide
    • Authors: Jianfeng Yang, Jingjing Yang, Ming Huang
      Abstract: Modern Physics Letters B, Ahead of Print.
      A cylindrical graphene plasmon waveguide (CGPW) which consists of two rolled graphene ribbons, a dielectric core and a dielectric interlayer is proposed. An analytical model for the single-mode condition and cutoff frequency of high-order graphene surface plasmon (GSP) modes is presented and verified by finite element method (FEM) simulations. Single-mode operation region of CGPW is identified in the frequency–radius space. By varying the separation between two graphene sheets and the Fermi level of graphene, a large tunability of the mode behavior is also demonstrated. The proposed structure may provide a new freedom to manipulate GSPs, and would lead to novel applications in optics.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-18T04:09:55Z
      DOI: 10.1142/S0217984916502687
       
  • The stability of portfolio investment in stock crashes
    • Authors: Yun-Xian Li, Zhen-Wei Qian, Jiang-Cheng Li, Nian-Sheng Tang, Dong-Cheng Mei
      Abstract: Modern Physics Letters B, Ahead of Print.
      The stability of portfolio investment in stock market crashes with Markowitz portfolio is investigated by the method of theoretical and empirical simulation. From numerical simulation of the mean escape time (MET), we conclude that: (i) The increasing number [math] of stocks in Markowitz portfolio induces a maximum in the curve of MET versus the initial position; (ii) A critical value of [math] in the behavior of MET versus the long-run variance or amplitude of volatility fluctuations maximumlly enhances the stability of portfolio investment. When [math] takes value below the critical value, the increasing [math] enhances the stability of portfolio investment, but restrains it when [math] takes value above the critical value. In addition, a good agreement of both the MET and probability density functions of returns is found between real data and theoretical results.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-16T08:25:38Z
      DOI: 10.1142/S0217984916502882
       
  • Homogeneous one-dimensional Bose–Einstein condensate
           in the Bogoliubov’s regime
    • Abstract: Modern Physics Letters B, Ahead of Print.
      We analyze the corrections caused by finite size effects upon the ground state properties of a homogeneous one-dimensional (1D) Bose–Einstein condensate. We assume from the very beginning that the Bogoliubov’s formalism is valid and consequently, we show that in order to obtain a well-defined ground state properties, finite size effects of the system must be taken into account. Indeed, the formalism described in the present paper allows to recover the usual properties related to the ground state of a homogeneous 1D Bose–Einstein condensate but corrected by finite size effects of the system. Finally, this scenario allows us to analyze the sensitivity of the system when the Bogoliubov’s regime is valid and when finite size effects are present. These facts open the possibility to apply these ideas to more realistic scenarios, e.g. low-dimensional trapped Bose–Einstein condensates.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-16T08:25:37Z
      DOI: 10.1142/S0217984916503073
       
  • The Nernst effect in layered superconductors under a magnetic field
    • Authors: Bui Duc Tinh, Le Minh Thu, Nguyen Quang Hoc
      Abstract: Modern Physics Letters B, Ahead of Print.
      We calculated the Nernst signal [math], describing the Nernst effect in type-II superconductor in the vortex–liquid regime, by using the time-dependent Ginzburg–Landau (TDGL) equation with thermal noise. The nonlinear interaction term in the TDGL equation is treated within self-consistent Gaussian approximation. The expression of the Nernst signal [math] including all the Landau levels is presented in explicit form which is applicable essentially to the whole phase. Our results are compared with the recent experimental data on high-[math] superconductor.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-16T08:25:33Z
      DOI: 10.1142/S021798491650281X
       
  • Localized surface plasmon resonance modes on an asymmetric cylindrical
           nanorod dimer
    • Authors: Rui-Bing Wang, Zhi-Dong Zhang, Guo-Tai Jiao, Chen-Yang Xue, Shu-Bin Yan, Hongyang Wang
      Abstract: Modern Physics Letters B, Ahead of Print.
      The extinction spectra and electric field distribution of an asymmetric cylindrical nanorod dimer (ACND) are calculated by discrete dipole approximation. The ACND is composed of two linear orders of cylindrical silver nanorods with different radii and lengths. The effects of the structural parameters of ACND on the localized surface plasmon resonance (LSPR) mode are also studied. Results show two resonance peaks in the extinction spectra of ACND: the higher-energy anti-bonding mode and the lower-energy bonding mode. The interaction of two hybridization plasmonic resonance modes produces an asymmetric line shape in the extinction spectra, which is considered to be a Fano resonance profile.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-16T08:25:33Z
      DOI: 10.1142/S0217984916502808
       
  • Simulation on a novel micron-array inertial impactor for submicron and
           ultrafine particle separation
    • Authors: Rui-Tao Liu, Lu-Qi Tao, Yi Yang, Tian-Ling Ren
      Abstract: Modern Physics Letters B, Ahead of Print.
      The particulate matter (PM), which was put forward in 1997 by US, had taken more and more attention due to the influence on human health. Although the mass concentration, number concentration and chemical composition of PM were still major research directions, how to collect these PMs more efficiently becomes critical. Inertial impactor is an effective separation device, however, due to different motion states of PM[math] and PM[math] in the flow field, the inertial impactor which can separate PM[math] from other PMs has not been fabricated. In this work, the motion states for both submicron and ultrafine particles were studied by using classical theory of channel aerodynamic, and a novel micron-array inertial impactor was designed and simulated for the first time. Besides, the influence of some characteristic parameters (W, T, S, Dc, etc.) on particle collection efficiency were researched and discussed through simulation results. This novel structure can be easily fabricated by MEMS technology or laser direct writing and also can be widely used in particle separation or flexible sensor fields.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-16T08:25:32Z
      DOI: 10.1142/S0217984916502730
       
  • All-optical spin switching: A new frontier in femtomagnetism — A
           short review and a simple theory
    • Authors: G. P. Zhang, T. Latta, Z. Babyak, Y. H. Bai, Thomas F. George
      Abstract: Modern Physics Letters B, Ahead of Print.
      Using an ultrafast laser pulse to manipulate the spin degree of freedom has broad technological appeal. It allows one to control the spin dynamics on a femtosecond time scale. The discipline, commonly called femtomagnetism, started with the pioneering experiment by Beaurepaire and coworkers in 1996, who showed subpicosecond demagnetization occurs in magnetic Ni thin films. This finding has motivated extensive research worldwide. All-optical helicity-dependent spin switching (AO-HDS) represents a new frontier in femtomagnetism, where a single ultrafast laser pulse can permanently switch spin without any assistance from a magnetic field. This review summarizes some of the crucial aspects of this new discipline: key experimental findings, leading mechanisms, controversial issues, and possible future directions. The emphasis is on our latest investigation. We first develop the all-optical spin switching (AOS) rule that determines how the switchability depends on the light helicity. This rule allows one to understand microscopically how the spin is reversed and why the circularly polarized light appears more powerful than the linearly polarized light. Then we invoke our latest spin-orbit coupled harmonic oscillator model to simulate single spin reversal. We consider both continuous wave (cw) excitation and pulsed laser excitation. The results are in a good agreement with the experimental result (a MatLab code is available upon request from the author). We then extend the code to include the exchange interaction among different spin sites. We show where the “inverse-Faraday field” comes from and how the laser affects the spin reversal nonlinearly. Our hope is that this review will motivate new experimental and theoretical investigations and discussions.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-04T07:15:34Z
      DOI: 10.1142/S0217984916300052
       
  • Heterogeneous edge weights promote epidemic diffusion
           in weighted evolving networks
    • Authors: Wei Duan, Zhichao Song, Xiaogang Qiu
      Abstract: Modern Physics Letters B, Ahead of Print.
      The impact that the heterogeneities of links’ weights have on epidemic diffusion in weighted networks has received much attention. Investigating how heterogeneous edge weights affect epidemic spread is helpful for disease control. In this paper, we study a Reed–Frost epidemic model in weighted evolving networks. Our results indicate that a higher heterogeneity of edge weights leads to higher epidemic prevalence and epidemic incidence at earlier stage of epidemic diffusion in weighted evolving networks. In addition, weighted evolving scale-free networks come with a higher epidemic prevalence and epidemic incidence than unweighted scale-free networks.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-04T07:15:19Z
      DOI: 10.1142/S0217984916503000
       
  • Temperature dependence of DNA condensation at high
           ionic concentration
    • Authors: Wei Mao, Qingqing Gao, Yanhui Liu, Yangtao Fan, Lin Hu, Houqiang Xu
      Abstract: Modern Physics Letters B, Ahead of Print.
      A series of experiments pointed out that compact states of DNA condensed by multivalent cation prefer higher temperature. The condensed DNA takes elongated coil or compact globule states and the population of the compact globule states increases with an increase in temperature. At the same time, a recent experimental work carried out in buffer solution without multivalent cation points out that DNA persistence length strongly depends on the temperature. DNA persistence length is a key parameter for quantitative interpretation of the conformational properties of DNA and related to the bending rigidity of DNA. It is necessary to revolve the effects of temperature dependence of persistence length on DNA condensation, and a model including the temperature dependence of persistence length and strong correlation of multivalent cation on DNA is provided. The autocorrelation function of the tangent vectors is found as an effective way to detect the temperature dependence of toroid conformations. With an increase in temperature, the first periodic oscillation in the autocorrelation function shifts left and the number of segments containing the first periodic oscillation decreases gradually. According to the experiments mentioned above, the long-axis length is defined to estimate the temperature dependence of condensation process further. At the temperatures defined in experiments mentioned above, the relation between long-axis length and temperature matches the experimental results.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-03T03:52:05Z
      DOI: 10.1142/S0217984916502985
       
  • A simulation study on the hydrogen storage properties of fullerene family
           molecules C[math] ([math], 60, 70) and their hydrides
    • Authors: Wei Dai, Ming Xiao, Mu-Qing Chen, Jia-Jing Xu, Yong-Jian Tang
      Abstract: Modern Physics Letters B, Ahead of Print.
      Hydrogen storage is a key factor for the application of hydrogen energy. From first principle calculation, we have acquired the energy barrier for hydrogen molecules to pass through the hexagonal rings and pentagonal rings of the fullerene. Then the absorption energy and energy barrier are used to analyze the hydrogen adsorption capacity of the fullerene family and their hydrides. We have also studied the hydrogen storage properties of the fullerene family and their hydrides by grand canonical Monte Carlo method. It is found that the weight density of hydrogen storage at ambient temperature and pressure can reach 7.71 wt.%. The results show that it is difficult for hydrogen to get into the carbon cage of the fullerene because of the high energy barrier, while it is beneficial to destroy the fullerene structure for the processes of absorption and desorption. Meanwhile, fullerene hydrogenation is an effective method to improve the hydrogen storage properties. Our study facilitates the design and synthesis of hydrogen storage materials, and provides theoretical support to improve the hydrogen storage capability for materials.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-02T07:43:32Z
      DOI: 10.1142/S0217984916503036
       
  • Investigations on growth and property of mid-infrared lithium selenoindate
           single crystals
    • Authors: Li Dai, Chao Tan, Zhehua Yan, Yuheng Xu
      Abstract: Modern Physics Letters B, Ahead of Print.
      Lithium selenoindate (LiInSe2) crystals with high optical quality are successfully grown by small-angle inclined horizontal temperature gradient condensation. In order to evaluate the various characteristics, the powder X-ray diffraction (XRD) spectrum, optical damage resistance ability and Vickers hardness in lithium selenoindate crystals were studied. The growth crystals have orthorhombic nature, a = 6.184 Å, b = 7.092 Å and c = 8.207 Å. The damage thresholds of LiInSe2 crystal with the front face and back face were 224 mW/cm2 and 165 mW/cm2. Also the Vickers hardness number of LiInSe2 crystal was found to be 342.4 kg/mm2.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-02T07:43:31Z
      DOI: 10.1142/S0217984916502900
       
  • Tunable multi-wavelength thulium-doped fiber laser incorporating two-stage
           cascaded Sagnac loop comb filter
    • Authors: Lianqing Zhu, Wei He, Mingli Dong, Xiaoping Lou, Fei Luo
      Abstract: Modern Physics Letters B, Ahead of Print.
      A tunable multi-wavelength narrow-linewidth thulium-doped fiber laser employing two-stage cascaded Sagnac loop mirrors is proposed and experimentally demonstrated. The designed fiber laser is composed of a pump source, wavelength division multiplex, circulator, thulium-doped fiber, polarization controllers (PCs), couplers and polarization-maintaining fibers (PMFs). Two cascaded Sagnac loops are used as the cavity reflector and filter, and the proposed filter is fabricated using two sections of PMFs with 2-m and 1-m lengths, respectively. In the experiment, the laser threshold is 110 mW, and laser can emit single, double, triple, quadruple and quintuple wavelengths in the spectral range of 1873–1901 nm through the simultaneous adjustment of the two PCs. The power fluctuations and 3-dB linewidth are less than 2.1 dB and 0.2 nm, respectively, over 10 min at room temperature, and the side-mode suppression ratio is greater than 20 dB. The proposed laser will be useful in various fields, such as spectral analysis, fiber sensing and optical communication.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-02T07:43:29Z
      DOI: 10.1142/S0217984916502924
       
  • An improved global dynamic routing strategy for scale-free
           network with tunable clustering
    • Authors: Lina Sun, Ning Huang, Yue Zhang, Yannan Bai
      Abstract: Modern Physics Letters B, Ahead of Print.
      An efficient routing strategy can deliver packets quickly to improve the network capacity. Node congestion and transmission path length are inevitable real-time factors for a good routing strategy. Existing dynamic global routing strategies only consider the congestion of neighbor nodes and the shortest path, which ignores other key nodes’ congestion on the path. With the development of detection methods and techniques, global traffic information is readily available and important for the routing choice. Reasonable use of this information can effectively improve the network routing. So, an improved global dynamic routing strategy is proposed, which considers the congestion of all nodes on the shortest path and incorporates the waiting time of the most congested node into the path. We investigate the effectiveness of the proposed routing for scale-free network with different clustering coefficients. The shortest path routing strategy and the traffic awareness routing strategy only considering the waiting time of neighbor node are analyzed comparatively. Simulation results show that network capacity is greatly enhanced compared with the shortest path; congestion state increase is relatively slow compared with the traffic awareness routing strategy. Clustering coefficient increase will not only reduce the network throughput, but also result in transmission average path length increase for scale-free network with tunable clustering. The proposed routing is favorable to ease network congestion and network routing strategy design.
      Citation: Modern Physics Letters B
      PubDate: 2016-08-02T07:43:20Z
      DOI: 10.1142/S0217984916503024
       
  • Finite-size scaling law in single-crystalline Fe3O4 hollow nanostructures
    • Authors: Xiaoping Zhang, Jun Wang, Miao Gao
      Abstract: Modern Physics Letters B, Ahead of Print.
      Single-crystalline Fe3O4 hollow nanostructures (nanoring and nanotube) have been successfully synthesized by a hydrothermal method along with a heat treatment process. The temperature dependences of the magnetization of the hollow nanostructures were measured under a high vacuum ([math] Torr) from 300[math]K to 900[math]K. The Curie temperatures of the nanoring and nanotube samples were found to decrease with decreasing the mean wall thickness. The Curie temperatures of the hollow magnetite nanostructures follow a finite-size scaling relation with the scaling exponent [math]. By comparison with those of the zero-dimensional Fe3O4 particles and two-dimensional Fe3O4 films, we show that the scaling relation for our hollow nanostructures is in better agreement with the quasi-two-dimensional finite-size scaling law.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-28T08:28:31Z
      DOI: 10.1142/S0217984916502419
       
  • External electric field promotes proton transfer in the radical cation of
           adenine–thymine
    • Authors: Guiqing Zhang, Shijie Xie
      Abstract: Modern Physics Letters B, Ahead of Print.
      According to [math] measurements, it has been predicted that proton transfer would not occur in the radical cation of adenine–thymine (A:T). However, recent theoretical calculations indicate that proton transfer takes place in the base pair in water below the room temperature. We have performed simulations of proton transfer in the cation of B-DNA stack composed of 10 A:T base pairs in water from 20 K to 300 K. Proton transfer occurs below the room temperature, meanwhile it could also be observed at the room temperature under the external electric field. Another case that interests us is that proton transfer bounces back after [math][math]300 fs from the appearance of proton transfer at low temperatures.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-28T08:28:30Z
      DOI: 10.1142/S0217984916502766
       
  • An optical pressure sensor based on [math]-shaped surface
           plasmon polariton resonator
    • Authors: Gaoyan Duan, Peilin Lang, Lulu Wang, Li Yu, Jinghua Xiao
      Abstract: Modern Physics Letters B, Ahead of Print.
      We propose a metal–insulator–metal (MIM) structure which consists of a [math]-shaped resonator and a surface plasmon polariton (SPP) waveguide. The finite element method (FEM) is employed in the simulation. The results show that this structure forms an optical pressure sensor. The transmission spectra have a redshift with increasing pressure, and the relation between the wavelength shift and the pressure is linear. The nanoscale pressure sensor shows a high sensitivity and may have potential applications in biological and biomedical engineering.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-28T08:28:27Z
      DOI: 10.1142/S0217984916502845
       
  • Numerical investigation on the femtosecond pulse propagation
           and free carriers’ evolution in silicon-on-insulator
           waveguides
    • Authors: Jin Wen, Chengju Ma, Wei Fan, Haiwei Fu, Zhenan Jia
      Abstract: Modern Physics Letters B, Ahead of Print.
      The femtosecond pulse propagation and free carriers’ evolution in the silicon-on-insulator (SOI) waveguides have been numerically investigated considering the carrier’s lifetime and the pulse width of the input pulse at 1.5 [math]m regime. Numerical results show that the free carriers’ density profile becomes gentle between the leading edge and trailing edge of the pulse in time domain due to the decreasing of the pulse intensity caused by the nonlinear absorption, which becomes more remarkable when the pulse width expands. It can be found that lifetime ranging from 5 ns to 100 ns does not affect the free carriers’ evolution clearly in femtosecond regime. In addition, the refractive index modulation can be appeared in the process of pulse propagation and free carriers evolution with lower peak power of 200 W. This research can supply some contribution to the insight of free carriers evolution in SOI waveguides.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-26T04:06:39Z
      DOI: 10.1142/S0217984916502997
       
  • Tri-integrable coupling of the Kaup-Newell soliton hierarchy and Liouville
           integrability
    • Authors: Shuimeng Yu, Yujian Ye, Jun Zhang, Junquan Song
      Abstract: Modern Physics Letters B, Ahead of Print.
      Based on a matrix Lie algebra consisting of [math] block matrices, new tri-integrable coupling of the Kaup–Newell soliton hierarchy is constructed. Then, the bi-Hamiltonian structure which leads to Liouville integrability of this coupling is furnished by the variational identity.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-25T03:17:20Z
      DOI: 10.1142/S0217984916502778
       
  • Dynamics of water trimer in femtosecond laser pulses
    • Authors: Zhiping Wang, Fengshou Zhang, Xuefeng Xu, Yanbiao Wang, Chaoyi Qian
      Abstract: Modern Physics Letters B, Ahead of Print.
      With the help of the time-dependent local-density approximation (TDLDA) coupled non-adiabatically to molecular dynamics (MD), we studied both the static properties and irradiation dynamics of water trimer subject to the short and intense femtosecond laser field. It is shown that the optimized geometry and the optical absorption strength of the water trimer accord well with results in literature. Three typical possible irradiated scenarios of water trimer which are “normal oscillation”, “dissociation and formation” and “pure OH dissociation” are exhibited by investigating the ionization and the level depletion related to electrons as well as the OH bonds, proton-transfer, the intermolecular distance and the kinetic energy connected with ions. In three scenarios, the behaviors of water trimer can be attributed to the sequential combination of responses of the electrons emission, the proton-transfer, OH vibration and rotation, OH dissociation and hydroxyl formation, respectively. The relevant time scales of the first proton-transfer and OH dissociation are identified as 13 fs and 10–20 fs, respectively. The study of kinetic energies of ions show that the kinetic energies of the remaining ions are all below 4.5 eV and outgoing hydrogen ions carry a kinetic energy about 5–12 eV. Furthermore, it is found that in the tunneling ionization situations the depletion is fairly shared between the various levels except the most deep occupied electronic level while in the multiphotonic ionization case the electron loss comes from all single-electron levels and the HOMO level contributes the most.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-25T03:17:19Z
      DOI: 10.1142/S0217984916502729
       
  • The Born–Mayer–Huggins potential in high temperature
           superconductors
    • Authors: Hempal Singh, Anu Singh, B. D. Indu
      Abstract: Modern Physics Letters B, Ahead of Print.
      The Born–Mayer–Huggins potential which has been found the best suitable potential to study the YBa2Cu3O[math] type high temperature superconductors is revisited in a new framework. A deeper insight in it reveals that the Born–Mayer parameters for different interactions in high temperature superconductor are not simple quantities but several thermodynamic and spatial functions enter the problem. Based on the new theory, the expressions for pressure, bulk modulus and Born–Mayer parameters have been derived and it is established that these quantities depend upon Gruneisen parameter which is the measure of the strength of anharmonic effects in high temperature superconductors. This theory has been applied to a specific model YBa2Cu3O[math] crystal for the purpose of numerical estimates to justify the new results.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:59:37Z
      DOI: 10.1142/S0217984916502833
       
  • A novel application classification and its impact on network performance
    • Authors: Shuo Zhang, Ning Huang, Xiaolei Sun, Yue Zhang
      Abstract: Modern Physics Letters B, Ahead of Print.
      Network traffic is believed to have a significant impact on network performance and is the result of the application operation on networks. Majority of current network performance analysis are based on the premise that the traffic transmission is through the shortest path, which is too simple to reflect a real traffic process. The real traffic process is related to the network application process characteristics, involving the realistic user behavior. In this paper, first, an application can be divided into the following three categories according to realistic application process characteristics: random application, customized application and routine application. Then, numerical simulations are carried out to analyze the effect of different applications on the network performance. The main results show that (i) network efficiency for the BA scale-free network is less than the ER random network when similar single application is loaded on the network; (ii) customized application has the greatest effect on the network efficiency when mixed multiple applications are loaded on BA network.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:59:23Z
      DOI: 10.1142/S021798491650278X
       
  • Effects of scale-free avalanche walks on anomalous diffusions
    • Authors: Hyun-Joo Kim
      Abstract: Modern Physics Letters B, Ahead of Print.
      Effects of scale-free avalanche walks on anomalous diffusions have been studied by introducing simple non-Markovian walk models. The scale-free avalanche walk is realized as a walker goes to one direction consistently in a time interval, the distribution of which follows a power-law. And it is applied to the memory models, in which the entire history of a walk process is memorized or the memory for the latest step is enhanced with time. The power-law avalanche walk with memory effects strengthens the persistence between steps and thus makes the Hurst exponent be larger than the cases without avalanche walks, while does not affect the anti-persistent nature.
      Citation: Modern Physics Letters B
      PubDate: 2016-07-20T08:58:23Z
      DOI: 10.1142/S0217984916502742
       
  • Alteration in non-classicality of light on passing through
           a linear polarization beam splitter
    • Authors: Namrata Shukla, Ranjana Prakash
      Abstract: Modern Physics Letters B, Ahead of Print.
      We observe the polarization squeezing in the mixture of a two mode squeezed vacuum and a simple coherent light through a linear polarization beam splitter. Squeezed vacuum not being squeezed in polarization, generates polarization squeezed light when superposed with coherent light. All the three Stokes parameters of the light produced on the output port of polarization beam splitter are found to be squeezed and squeezing factor also depends upon the parameters of coherent light.
      Citation: Modern Physics Letters B
      PubDate: 2016-06-21T08:27:53Z
      DOI: 10.1142/S0217984916502894
       
 
 
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