Authors:Kuldeep Kholiya, Jeewan Chandra Abstract: Modern Physics Letters B, Volume 29, Issue 27, 10 October 2015. On the basis of the thermal equation-of-state a simple theoretical model is developed to study the pressure dependence of melting temperature. The model is then applied to compute the high pressure melting curve of 10 metals (Cu, Mg, Pb, Al, In, Cd, Zn, Au, Ag and Mn). It is found that the melting temperature is not linear with pressure and the slope [math] of the melting curve decreases continuously with the increase in pressure. The results obtained with the present model are also compared with the previous theoretical and experimental data. A good agreement between theoretical and experimental result supports the validity of the present model. Citation: Modern Physics Letters B PubDate: 2015-10-07T09:47:16Z DOI: 10.1142/S0217984915501614

Abstract: Modern Physics Letters B, Ahead of Print. A long-standing unsolved problem is how a microscopic theory of superconductivity in cuprate superconductors based on the charge-spin separation can produce a large electron Fermi surface (EFS). Within the framework of the kinetic-energy driven superconducting mechanism, a full charge-spin recombination scheme is developed to fully recombine a charge carrier and a localized spin into an electron, and then is employed to study the electron-momentum distribution in cuprate superconductors. In particular, the theory shows that the underlying EFS fulfills Luttinger’s theorem, and the sum rule for the constrained electron is obeyed. Citation: Modern Physics Letters B PubDate: 2015-10-02T11:54:59Z DOI: 10.1142/S021798491550178X

Authors:Vinod Ashokan, B. D. Indu Abstract: Modern Physics Letters B, Ahead of Print. In the present work, the phonon density of states (PDOS) for [math] crystal is investigated by using the double time thermodynamic Green’s function method via a non-perturbative approach. A newly formulated Hamiltonian is considered for the lattice dynamics of phonon, which includes the effects of electron–phonon interactions, lattice anharmonicities and the interacting isotopic impurities. The automated emergence of pairons and [math] wave pairing mechanism appears as a salient features of the theory. The PDOS is found to be dependent on temperature, impurity concentration, electron–phonon coupling coefficient and renormalized frequencies, and the numerical investigations on PDOS exhibits fairly good agreements with the inelastic neutron scattering experimental observations. Citation: Modern Physics Letters B PubDate: 2015-10-02T11:54:58Z DOI: 10.1142/S0217984915501778

Authors:Michele Bellingeri, Elena Agliari, Davide Cassi Abstract: Modern Physics Letters B, Ahead of Print. The best strategy to immunize a complex network is usually evaluated in terms of the percolation threshold, i.e. the number of vaccine doses which make the largest connected cluster (LCC) vanish. The strategy inducing the minimum percolation threshold represents the optimal way to immunize the network. Here we show that the efficacy of the immunization strategies can change during the immunization process. This means that, if the number of doses is limited, the best strategy is not necessarily the one leading to the smallest percolation threshold. This outcome should warn about the adoption of global measures in order to evaluate the best immunization strategy. Citation: Modern Physics Letters B PubDate: 2015-10-02T11:54:58Z DOI: 10.1142/S0217984915501808

Authors:Oleg Rybin, Sergey Shulga Abstract: Modern Physics Letters B, Ahead of Print. Ultra-low refractive index irradiative structure is considered. The structure consists of a patch antenna with the metamaterial slab located on top of the antenna, as superstrate. In this study, ultra-low index phenomenon of the irradiative system is associated with improving the directivity of the patch antenna by putting the metamaterial slab on top of the antenna. The last phenomenon, in turn, is associated with the feedback partial magnetization of Iron inclusions of the slab caused by the radiation from the antenna. Mathematical model for evaluating the complex effective relative permittivity of the irradiative structure is developed. Numerical calculations for complex effective relative permittivity of the irradiative structure and real part of the complex effective relative permeability of the metamaterial slab are done in the study. Citation: Modern Physics Letters B PubDate: 2015-10-02T11:54:55Z DOI: 10.1142/S0217984915501791

Authors:C. Yuce Abstract: Modern Physics Letters B, Ahead of Print. The free particle Schrödinger equation admits a nontrivial self-accelerating Airy wave packet solution. Recently, the Airy beams that freely accelerate in space was experimentally realized in photonics community. Here, we present self-accelerating waves for the Bose–Einstein condensate in a time-dependent harmonic oscillator potential. We show that parity and time reversal symmetries for self-accelerating waves are spontaneously broken. Citation: Modern Physics Letters B PubDate: 2015-10-01T03:48:30Z DOI: 10.1142/S0217984915501717

Authors:Naveed Afzal, Mutharasu Devarajan, Kamarulazizi Ibrahim Abstract: Modern Physics Letters B, Ahead of Print. This work investigates the growth of AlInN films on Si (100) substrates through the annealing of Al and InN stacking layers in the temperature range 200[math]C to 800[math]C. The Al/InN layers were prepared on Si (100) substrates using RF magnetron sputtering technique at 100[math]C. The layers were annealed in a quartz tube furnace at 200[math]C, 400[math]C, 600[math]C and 800[math]C for six hours. Structural features of the films were examined through XRD whereas the surface morphology and composition of the films were studied through FESEM and EDS, respectively. The FESEM and EDS cross-sectional analyses of the films were also conducted to observe the mixing of Al/InN stacking layers. XRD patterns revealed the formation of polycrystalline AlInN films whereas the FESEM and EDS cross-sectional results indicated that the mixing of Al/InN stacked layers became more prominent with increase of the annealing temperature. Surface roughness of the films studied through AFM also exhibited an increasing trend with increase of the annealing temperature. Citation: Modern Physics Letters B PubDate: 2015-10-01T03:48:30Z DOI: 10.1142/S0217984915501699

Authors:Sylvain D. Brechet, Jean-Philippe Ansermet Abstract: Modern Physics Letters B, Ahead of Print. The thermodynamics of irreversible processes in continuous media predicts the existence of a magnetic Nernst effect that results from a magnetic analog to the Seebeck effect in a ferromagnet and magnetophoresis occurring in a paramagnetic electrode in contact with the ferromagnet. Thus, a voltage that has DC and AC components is expected across a Pt electrode as a response to the inhomogeneous magnetic induction field generated by magnetostatic waves of an adjacent YIG slab subject to a temperature gradient. The voltage frequency and dependence on the orientation of the applied magnetic induction field are quite distinct from that of spin pumping. Citation: Modern Physics Letters B PubDate: 2015-10-01T03:48:29Z DOI: 10.1142/S0217984915502462

Authors:Meiling Wang, Wenping Ma, Lili Wang, Xunru Yin Abstract: Modern Physics Letters B, Ahead of Print. A quantum proxy group signature (QPGS) scheme based on controlled teleportation is presented, by using the entangled five-qubit quantum state functions as quantum channel. The scheme uses the physical characteristics of quantum mechanics to implement delegation, signature and verification. The security of the scheme is guaranteed by the entanglement correlations of the entangled five-qubit state, the secret keys based on the quantum key distribution (QKD) and the one-time pad algorithm, all of which have been proven to be unconditionally secure and the signature anonymity. Citation: Modern Physics Letters B PubDate: 2015-10-01T03:48:28Z DOI: 10.1142/S0217984915501730

Authors:Sontosh Kumar, W. Madhuri, S. Kalainathan Abstract: Modern Physics Letters B, Ahead of Print. The objective of mechanical stress sensor is to measure the applied pressure or provide control standard to the process. In order to accomplish this, most of the stress sensors convert mechanical stress into electronic signal. Ferrites are the best known magnetic semiconductors. This paper brings out the variation in inductance of the micro-inductor made from [math] on application of mechanical stress. [math] ferrite nanoparticles are synthesized by sol–gel autocombustion technique. The ferrite powder thus obtained is double sintered at 450[math]C and 870[math]C in a microwave furnace. The X-ray diffraction pattern of the ferrite confirms spinal structure. The frequency spectrum of dielectric constant is done in the range of 100 to 5 MHz frequency. The variation of inductance [math]% with applied compressive stress on the micro-inductor made from the ferrite is measured in the range of 0–8 MPa. Citation: Modern Physics Letters B PubDate: 2015-10-01T03:48:23Z DOI: 10.1142/S0217984915501766

Authors:Tingping Zhang, Bin Fang, Xinyu Liang Abstract: Modern Physics Letters B, Ahead of Print. Identifying influential nodes is a basic measure of characterizing the structure and dynamics in complex networks. In this paper, we use network global efficiency by removing edges to propose a new centrality measure for identifying influential nodes in complex networks. Differing from the traditional network global efficiency, the proposed measure is determined by removing edges from networks, not removing nodes. Instead of static structure properties which are exhibited by other traditional centrality measures, such as degree centrality (DC), betweenness centrality (BC) and closeness centrality (CC), we focus on the perspective of dynamical process and global structure in complex networks. Susceptible-infected (SI) model is utilized to evaluate the performance of the proposed method. Experimental results show that the proposed measure is more effective than the other three centrality measures. Citation: Modern Physics Letters B PubDate: 2015-10-01T03:48:23Z DOI: 10.1142/S0217984915501687

Authors:Guanghan Peng Abstract: Modern Physics Letters B, Ahead of Print. In this paper, a new lattice model is proposed with the consideration of the driver’s anticipation effect with passing for two-lane traffic system. The linear stability condition and the mKdV equation which are correlative to the driver’s anticipation effect with passing are derived from linear stability analysis and nonlinear analysis, respectively. Numerical simulation shows that the driver’s anticipation effects with passing can efficiently enhance the stability of traffic flow under lane changing on two-lane highway. Citation: Modern Physics Letters B PubDate: 2015-10-01T03:48:18Z DOI: 10.1142/S0217984915501742

Authors:Fabio Cardone, Roberto Mignani, Andrea Petrucci Abstract: Modern Physics Letters B, Ahead of Print. We discuss the possible violation of local Lorentz invariance (LLI) arising from a faster-than-light neutrino speed. A toy calculation of the LLI violation parameter [math], based on the (disclaimed) OPERA data, suggests that the values of [math] are determined by the interaction involved, and not by the energy range. This hypothesis is further corroborated by the analysis of the more recent results of the BOREXINO, LVD and ICARUS experiments. Citation: Modern Physics Letters B PubDate: 2015-10-01T03:48:18Z DOI: 10.1142/S0217984915501705

Authors:A. K. Kavala, A. K. Mukherjee Abstract: Modern Physics Letters B, Ahead of Print. A short channel organic field effect transistors (OFET) based on Pentacene, having channel length in the range of sub-micrometer, has been numerically modelled for low values of drain voltage. The output characteristics show a nonlinear concave increase of drain current for all values of gate voltages. This anomalous current-voltage behavior, which resembles sub-threshold characteristics of silicon FETs, shows a good match with earlier experimental reports on OFET at low drain voltages. The sub-threshold-like characteristics has been interpreted in light of thermionic-emission model because of the presence of hole injection barrier at drain (gold)/Pentacene interface. The associated analysis has facilitated to obtain a significant parameter, effective channel thickness [math], for the first time in case of OFETs. It came out to be roughly 4 nm and 8 nm for experimental devices of poly(3-hexylthiophene-2,5-diyl) and Pentacene, respectively, while the numerically modelled device yielded a value of about 60 nm. Increase of [math] with transverse gate electric field is also observed. Physical explanation of the observations is also presented. Citation: Modern Physics Letters B PubDate: 2015-10-01T03:48:17Z DOI: 10.1142/S0217984915501729

Authors:Jun Wang, Xinxin Ye, Xinba Yaer, Yin Wu, Boyu Zhang, Lei Miao Abstract: Modern Physics Letters B, Ahead of Print. One-step molten salt synthesis process was introduced to fabricate nano to micrometer sized [math] powders in which effects of synthesis temperature, oxide-to-flux ratios and raw materials on the generation of [math] powders were examined. 100 nm or above sized pure [math] particles were obtained at relatively lower temperature of 900[math]C. Micro-sized rhombohedral crystals with a maximum size of approximately 12 [math]m were obtained from [math] or [math] strontium source with 1:1 O/S ratio. Controlled crystal size and morphology of Nb-doped [math] particles are prepared by using this method to confirm the performance of thermoelectric properties. The Seebeck coefficient obtained is significantly high when compared with the reported data, and the high ratio of nano particles in the sample has a positive effect on the increase of Seebeck coefficient too, which is likely due to the energy filtering effect at large numbers of grain boundaries resulting from largely distributed structure. Citation: Modern Physics Letters B PubDate: 2015-10-01T03:48:17Z DOI: 10.1142/S0217984915501675

Authors:Lin Du, Ying Zhang, Zhongkui Sun, Xiaole Yue Abstract: Modern Physics Letters B, Ahead of Print. The suppression of the pattern complexity of spatiotemporal chaos in Coupled Acousto-optic Bistable Map Lattice system (CABMLs) is investigated. The pattern complexity of spatiotemporal dynamics is exhibited quantitatively by employing the average Kolmogorov–Sinai (KS) entropy density according to the Lyapunov exponents of lattices. By designing a global control method with periodic state feedback, we provide the stability analysis for suppressing spatiotemporal chaos to a stable state. Then, a pattern control strategy using discrete-space state feedback with equal intervals is proposed. Numerical simulations demonstrate that the pattern complexity of spatiotemporal chaos is decreased to a low level by the proposed method. Finally, the dependence of the control effect on the control interval is discussed in detail by considering the control efficiency and control cost and the optimal control interval is obtained. Citation: Modern Physics Letters B PubDate: 2015-09-21T07:22:32Z DOI: 10.1142/S021798491550164X

Authors:Wei Zhang, Qing Yun Chen, Bin Li, Zhao Yi Zeng, Ling Cang Cai Abstract: Modern Physics Letters B, Ahead of Print. The ground state properties of the silicon clathrate [math] intercalated by alkali metal sodium atoms [math] are investigated by first-principle methods. Birch–Murnaghan equation of state is fitted to two sets of the [math]–[math] data calculated by density functional theory based on the plane-wave basis set within both the local density approximation (LDA) and the generalized gradient approximation (GGA). Through quasi-harmonic Debye model, some thermodynamic properties comprise the heat capacity, the thermal expansion coefficient, Debye temperature and the Grüneisen parameter for this clathrate compounds [math] are obtained, which agree well with experimental results. Comparing the calculated heat specific in two ways with experimental results, we find that it is more accurate to describe the “rattle” modes of gust Na atoms in the cages as Einstein oscillators. Moreover, the effects of high pressure on these thermodynamic properties are also investigated which will be very helpful for a synthesis of these clathrate compounds in experiments under high pressure and high temperature condition. Citation: Modern Physics Letters B PubDate: 2015-09-21T07:22:30Z DOI: 10.1142/S0217984915501663

Authors:H. Chung, N. Kim, H. Kim Abstract: Modern Physics Letters B, Ahead of Print. We investigate evolution of properties of an extended [math]-wave superconductor, when the order parameter varies from an [math]-wave to a [math]-wave continuously, by using a model order parameter [math]. The evolution of the gap amplitude, the density of states and the specific heat are mainly focused on. For [math], due to the existence of a finite sized gap, the characteristic behaviors more or less follow those of the [math]-wave. Sudden changes in the characteristic behaviors come out for [math], due to appearances of nodes. For [math], point nodes in the order parameter on the Fermi surface appear, while for [math], line nodes appear. Although they are different kinds of nodes which would usually induce different power-law dependencies in superconducting properties, interestingly enough, they give rise to the same characteristic behavior. The detailed structure of the point nodes for [math] is investigated, and it is explained why they lead to the same dependence as the line nodes. Citation: Modern Physics Letters B PubDate: 2015-09-21T07:22:28Z DOI: 10.1142/S0217984915501638

Authors:Huawang Qin, Xiaohua Zhu, Yuewei Dai Abstract: Modern Physics Letters B, Ahead of Print. A proactive quantum secret sharing scheme is proposed, in which the participants can update their shadows periodically. In an updating period, one participant randomly generates the GHZ states and sends the particles to the other participants, and the participants update their shadows according to the measurement performed on the particles. After an updating period, each participant can change his shadow but the secret is changeless. The old shadows will be useless even if they have been stolen by the attacker. The proactive property is very useful to resist the mobile attacker. Citation: Modern Physics Letters B PubDate: 2015-09-21T07:22:28Z DOI: 10.1142/S0217984915501651

Authors:Yong Li, Xiaopeng Jia, Mousheng Song, Hong-An Ma, Zhenxiang Zhou, Chao Fang, Fangbiao Wang, Ning Chen, Ying Wang Abstract: Modern Physics Letters B, Ahead of Print. In this paper, diamond single crystals doped with LiH and boron additives were synthesized in [math]–[math] system under high pressure and high temperature. Under the fixed pressure condition, we found that the synthesis temperature increased slightly after the addition of LiH in the synthesis system. The {100}-orientated surface morphology was investigated by scanning electron microscopy (SEM). The nitrogen concentration in the obtained diamond was analyzed and evaluated using Fourier transmission infrared spectroscopy (FTIR). Furthermore, the electrical properties of Ib-type and boron-doped diamond before and after hydrogenation using Hall effect measurement, which suggested that the conductivity of diamond co-doped with hydrogen and boron was obviously enhanced than that of boron-doped diamond. Citation: Modern Physics Letters B PubDate: 2015-09-21T07:22:27Z DOI: 10.1142/S0217984915501626

Authors:Q. L. He, S. Y. Li, F. Gao, Z. Zhu, X. Hu, H. Z. Song Abstract: Modern Physics Letters B, Ahead of Print. The Na doping effects on the high temperature thermoelectric properties of [math] ([math] = 0, 0.05, 0.10, 0.15, 0.20 and 0.30) ceramics were investigated from 343 K to 973 K. When [math], the electrical resistivity of [math] decreases with increasing Na doping amount due to the hole-doping effect, which exhibits metallic electrical conductivity behavior. While, at the temperature range of 480–830 K, the samples with [math] exhibit semiconductor electrical conductivity behavior instead. The Seebeck coefficients are improved by Na doping at lower temperature, but they decrease slightly at higher temperature except for [math]. Roughly, the thermal conductivity is depressed by the doping defects. As an overall result, the dimensionless figure of merit [math] of [math] reaches the maximum value of 0.3 K at 973 K, which is nearly twice the value of the undoped sample [math]. Citation: Modern Physics Letters B PubDate: 2015-09-14T05:55:18Z DOI: 10.1142/S0217984915501596

Authors:Yanhua Wang, Xiaoyu Shang, Xiaowei Wang, Jianying Tong, Jingcheng Xu Abstract: Modern Physics Letters B, Ahead of Print. Functionalization of [math] monolayer doped by the transition-metal Fe adatom [math]–[math] and NO absorption on [math]–[math] has been investigated computationally using first-principles calculations based on the density functional theory. We found that the system of [math]–[math] remains a semiconductor, with spin polarization at the Fermi level. However, for the system with absorption of NO molecule on the surface of [math]–[math] monolayer, its spin polarization is turned over at the Femi level, which provides a promising material for spintronic sensors. Citation: Modern Physics Letters B PubDate: 2015-09-14T05:55:15Z DOI: 10.1142/S0217984915501602

Authors:N. H. Abd El-Wahab, Ahmed Salah Abstract: Modern Physics Letters B, Ahead of Print. We study the interaction between a single mode electromagnetic field and a three-level [math]-type atom in the presence of a classical homogenous gravitational field when the atom is prepared initially in the momentum eigenstate. The model includes the detuning parameters and the classical homogenous gravitational field. The wave function is calculated by using the Schrödinger equation for a coherent electromagnetic field and an atom is in its excited state. The influence of the detuning parameter and the classical homogenous gravitational field on the temporal behavior of the mean photon number, the normalized second-order correlation function and the normal squeezing is analyzed. The results show that the presence of these parameters has an important effect on these phenomena. The conclusion is reached and some features are given. Citation: Modern Physics Letters B PubDate: 2015-09-02T06:56:56Z DOI: 10.1142/S0217984915501754