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Journal Cover Modern Physics Letters B
  [SJR: 0.222]   [H-I: 33]   [9 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]
  • A pressure-deformation analytical model for rectangular diaphragm of MEMS
           pressure sensors
    • Abstract: Modern Physics Letters B, Volume 31, Issue 05, 20 February 2017.
      Rectangular diaphragm is commonly used as a pressure sensitive component in MEMS pressure sensors. Its deformation under applied pressure directly determines the performance of micro-devices, accurately acquiring the pressure–deflection relationship, therefore, plays a significant role in pressure sensor design. This paper analyzes the deflection of an isotropic rectangular diaphragm under combined effects of loads. The model is regarded as a clamped plate with full surface uniform load and partially uniform load applied on its opposite sides. The full surface uniform load stands for the external measured pressure. The partial load is used to approximate the opposite reaction of the silicon island which is planted on the diaphragm to amplify the deformation displacement, thus to improve the sensitivity of the pressure sensor. Superposition method is proposed to calculate the diaphragm deflections. This method considers separately the actions of loads applied on the simple supported plate and moments distributed on edges. Considering the boundary condition of all edges clamped, the moments are constructed to eliminate the boundary rotations caused by lateral load. The diaphragm’s deflection is computed by superposing deflections which produced by loads applied on the simple supported plate and moments distributed on edges. This method provides higher calculation accuracy than Galerkin variational method, and it is used to analyze the influence factors of the diaphragm’s deflection, includes aspect ratio, thickness and the applied force area of the diaphragm.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-21T02:49:36Z
      DOI: 10.1142/S0217984917500464
       
  • Terahertz planar waveguide devices based on graphene
    • Abstract: Modern Physics Letters B, Volume 31, Issue 05, 20 February 2017.
      We present a theoretical study on graphene-semiconductor planar structures. The frequency of the photonic modes in the structure, which can be efficiently tuned via varying the sample parameters, is within the terahertz (THz) bandwidth. Furthermore, it is found that a roughly linear dispersion relation can be obtained for photonic modes in the THz region. Hence, the proposed graphene-semiconductor planar structures can be served as THz waveguide with desirable transmission characteristics.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-21T02:49:29Z
      DOI: 10.1142/S0217984917500452
       
  • Global stabilization of memristor-based fractional-order neural networks
           with delay via output-feedback control
    • Abstract: Modern Physics Letters B, Volume 31, Issue 05, 20 February 2017.
      In this paper, the memristor-based fractional-order neural networks (MFNN) with delay and with two types of stabilizing control are described in detail. Based on the Lyapunov direct method, the theories of set-value maps, differential inclusions and comparison principle, some sufficient conditions and assumptions for global stabilization of this neural network model are established. Finally, two numerical examples are presented to demonstrate the effectiveness and practicability of the obtained results.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-21T02:49:25Z
      DOI: 10.1142/S0217984917500312
       
  • Modulation of electromagnetic local density of states by coupling of
           surface phonon-polariton
    • Abstract: Modern Physics Letters B, Ahead of Print.
      We studied the electromagnetic local density of state (EM-LDOS) near the surface of a one-dimensional multilayer structure (1DMS) alternately stacked by SiC and Si. EM-LDOS of a semi-infinite bulk appears two intrinsic peaks due to the resonance of surface phonon-polariton (SPhP) in SiC. In contrast with that of SiC bulk, SPhP can exist at the interface of SiC and Si for the 1DMS. The SPhPs from different interfaces can couple together, which can lead to a significant modulation of EM-LDOS. When the component widths of 1DMS are large, the spectrum of EM-LDOS exhibits oscillation behavior in the frequency regime larger than the resonance frequency of SPhP. While the component widths are small, due to the strong coupling of SPhPs, another peak appears in the EM-LDOS spectrum besides the two intrinsic ones. And the position of the new peak move toward high frequency when the width ratio of SiC and Si increases. The influences of distance from the surfaces and period of 1DMS on EM-LDOS have also been studied in detail. The results are helpful in studying the near-field radiative heat transfer and spontaneous emission.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-23T03:31:54Z
      DOI: 10.1142/S0217984917500506
       
  • The a-cycle problem in XY model with ring frustration
    • Abstract: Modern Physics Letters B, Ahead of Print.
      Traditionally, the transverse spin-[math] XY model is mapped to a fermionic “c-cycle” problem, where the prior periodic boundary condition is applied to the fermionic chain and the additional boundary term has been neglected. However, the “a-cycle” problem (the original problem without any approximation) has not been treated seriously up to now. In this paper, we consider the XY model with ring frustration and diagonalize it without any approximation with the help of parity constraint. Then two peculiar gapless phases have been found.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-23T03:31:54Z
      DOI: 10.1142/S0217984917500610
       
  • Finite element investigation into the thermal conductivity
           of carbon nanotube/aluminum nanocomposites
    • Abstract: Modern Physics Letters B, Ahead of Print.
      This paper aims to study the thermal conductivity coefficient of aluminum matrices reinforced by single-walled carbon nanotubes. To obtain the thermal conductivity coefficient of the nanocomposites, a small temperature difference is applied on two opposite edges of a representative volume element. The nanotubes are distributed in Al matrix by using three different patterns, including random pattern, regular pattern with nanotube direction along the temperature difference and regular pattern with nanotube direction perpendicular to the temperature change. It is shown that the best enhancement in the thermal conductivity of aluminum matrix occurs by the regular distribution of the nanotubes along the temperature change. Also, increasing the volume fraction of nanotubes in aluminum matrix leads to increasing the thermal conductivity coefficient of the nanocomposite.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-22T09:49:58Z
      DOI: 10.1142/S0217984917500531
       
  • The mechanical, optical and thermoelectric properties of MCoF3 (M = K and
           Rb) compounds
    • Abstract: Modern Physics Letters B, Ahead of Print.
      This is an ab initio study instituted on the density functional theory (DFT) and the full-potential linearized augmented plane wave (FP-LAPW) calculations that are performed to analyze the mechanical, electronic, optical and thermoelectric properties of the cubic MCoF3 compound (M = K and Rb). The studied compounds are found thermodynamically and mechanically stable. Moreover, these compounds are found to be elastically anisotropic and ductile. KCoF3 and RbCoF3 are classified as half-metallic and anti-ferromagnetic compounds. The optical properties are investigated from the dielectric function for the different energy ranges. The thermoelectric properties such as transport properties are determined as a function of temperature using BoltzTrape code in the range of 20–800 K. The present compounds are found to have p-type character. Also, the majority charge carriers are found to be electrons rather than hole. Useful mechanical, spintronic, optical and thermoelectric applications are predicted based upon the calculations.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-22T09:49:57Z
      DOI: 10.1142/S0217984917500336
       
  • A temperature characteristic research and compensation design for
           micro-machined gyroscope
    • Abstract: Modern Physics Letters B, Ahead of Print.
      The all temperature range stability is the most important technology of MEMS angular velocity sensor according to the principle of capacity detecting. The correlation between driven force and zero-point of sensor is summarized according to the temperature characteristic of the air-damping and resonant frequency of sensor header. A constant trans-conductance high-linearity amplifier is designed to realize the low phase-drift and low amplitude-drift interface circuit at all-temperature range. The chip is fabricated in a standard 0.5 [math]m CMOS process. Compensation achieved by driven force to zero-point drift caused by the stiffness of physical construction and air-damping is adopted. Moreover, the driven force can be obtained from the drive-circuit to avoid the complex sampling. The test result shows that the zero-point drift is lower than 30[math]/h (1-sigma) at the temperature range from [math]C to 60[math]C after three-order compensation made by driven force.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-21T10:24:04Z
      DOI: 10.1142/S0217984917500646
       
  • Bilinear form and soliton solutions for the fifth-order
           Kaup–Kupershmidt equation
    • Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, multi-soliton solutions of the fifth-order Kaup–Kupershmidt (KK) equation have been derived via the auxiliary function in conjunction with the bilinear method. These solutions have not been previously obtained. Propagation and interactions of three solitons have been presented analytically. The direction of the soliton is related to the signs of the parameters [math]. The distances of the solitons are related to the values of the parameters [math].
      Citation: Modern Physics Letters B
      PubDate: 2017-02-21T10:24:03Z
      DOI: 10.1142/S0217984917500579
       
  • Effects of sintering atmospheres on phase transformation, oxygen vacancy
           and photoabsorption behaviors of highly Fe-doped titania crystals
    • Abstract: Modern Physics Letters B, Ahead of Print.
      Fe-doped TiO2 crystals were successfully prepared using a sol–gel technique in reducing and oxidizing atmospheres. The effects of sintering atmosphere on phase transformation, oxygen vacancy concentration and photoabsorption behaviors were investigated. The results indicate that upon sintering in reducing atmosphere, Ti and Fe ion valences were decreased and highly Fe ions (12 mol%) were entirely dissolved into titania crystals, increasing oxygen vacancy concentration and leading to increased photoabsorption capability. In contrast, sintering in oxidizing atmosphere causes precipitation of the Fe2O3 phase, which is detrimental to the photoabsorption capability. The best photoabsorption performance is obtained by sintering 12 mol% Fe-doped TiO2 in reducing atmosphere, resulting in an absorption edge of approximately 435 nm, which is much higher than that of undoped TiO2 in the oxidizing atmospheres with the absorption edge 352 nm.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-21T10:24:03Z
      DOI: 10.1142/S0217984917500622
       
  • Generalized Maxwell equations and charge conservation censorship
    • Abstract: Modern Physics Letters B, Ahead of Print.
      The Aharonov–Bohm electrodynamics is a generalization of Maxwell theory with reduced gauge invariance. It allows to couple the electromagnetic field to a charge which is not locally conserved, and has an additional degree of freedom, the scalar field [math], usually interpreted as a longitudinal wave component. By reformulating the theory in a compact Lagrangian formalism, we are able to eliminate S explicitly from the dynamics and we obtain generalized Maxwell equation with interesting properties: they give [math] as the (conserved) sum of the (possibly non-conserved) physical current density [math], and a “secondary” current density [math] which is a nonlocal function of [math]. This implies that any non-conservation of [math] is effectively “censored” by the observable field [math], and yet it may have real physical consequences. We give examples of stationary solutions which display these properties. Possible applications are to systems where local charge conservation is violated due to anomalies of the Adler–Bell–Jackiw (ABJ) kind or to macroscopic quantum tunnelling with currents which do not satisfy a local continuity equation.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-21T10:24:00Z
      DOI: 10.1142/S021798491750052X
       
  • Analytical investigation on the minimum traffic delay at a three-phase
           signalized T-type intersection
    • Abstract: Modern Physics Letters B, Ahead of Print.
      The traffic delay at intersections is crucial for the performance of urban traffic system. This paper analytically investigated the minimum traffic delay at a three-phase T-type intersection. We firstly demonstrate that the minimum traffic delay must be achieved on the surface of the 3D space constituted by the three constraints. Next, we prove that the minimum traffic delay must be achieved on the three borderlines of the surface. Finally, we show that the minimum delay is achieved either on one specific borderline or at the vertex of the surface. In the former case, extra green time is needed for the stream with largest demand, while no extra green time should be assigned to any stream in the latter case.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-21T10:24:00Z
      DOI: 10.1142/S0217984917500634
       
  • Collective behavior states in animal groups
    • Authors: Dorílson S. Cambui
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this work, we study some states of collective behavior observed in groups of animals. For this end we consider an agent-based model with biologically motivated behavioral rules where the speed is treated as an independent stochastic variable, and the motion direction is adjusted in accord with alignment and attractive interactions. Four types of collective behavior have been observed: disordered motion, collective rotation, coherent collective motion, and formation flight. We investigate the case when transitions between collective states depend on both the speed and the attraction between individuals. Our results show that, to any size of the attraction, small speeds are associated to the coherent collective motion, while collective rotation is more and more pronounced for high speed since the attraction radius is large enough.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-17T08:44:51Z
      DOI: 10.1142/S0217984917500543
       
  • Performance analysis on cascaded asymmetric photonic crystal
           Mach–Zehnder tunable filter
    • Authors: Ying Chen, Zhiyong Zhao, Teng Liu, Lei He, Yuanjian Di, Xingning Cui
      Abstract: Modern Physics Letters B, Ahead of Print.
      A cascaded asymmetric photonic crystal Mach–Zehnder filter structure is proposed to improve the quality factor (Q value) and the sensitivity of the tunable optical filter. The mathematical relationship between the output wavelength of M–Z filter and the voltage applied on the multilayer PZT is established. The simulation results show that the full width at half maximum can be decreased from 17 nm to 9 nm, in addition, the transmission peak wavelength varies by adjusting the applied voltage and the sensitivity can attain to 0.7 nm/V by using the multilayer PZT, which can achieve tunable filtering effectively.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-16T09:24:14Z
      DOI: 10.1142/S0217984917500348
       
  • Breathers and rogue waves for an eighth-order nonlinear
           Schrödinger equation in an optical fiber
    • Authors: Wen-Qiang Hu, Yi-Tian Gao, Chen Zhao, Zhong-Zhou Lan
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, an eighth-order nonlinear Schrödinger equation is investigated in an optical fiber, which can be used to describe the propagation of ultrashort nonlinear pulses. Lax pair and infinitely-many conservation laws are derived to verify the integrability of this equation. Via the Darboux transformation and generalized Darboux transformation, the analytic breather and rogue wave solutions are obtained. Influence of the coefficients of operators in this equation, which represent different order nonlinearity, and the spectral parameter on the propagation and interaction of the breathers and rogue waves is also discussed. We find that (i) the periodic of the breathers decreases as the augment of the spectral parameter; (ii) the coefficients of operators change the compressibility and periodic of the breathers, and can affect the interaction range and temporal–spatial distribution of the rogue waves.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-16T09:24:13Z
      DOI: 10.1142/S021798491750035X
       
  • Structural properties of liquid aluminosilicate with varying Al2O3/SiO2
           ratios: Insight from analysis and visualization of molecular dynamics data
           
    • Authors: N. V. Yen, M. T. Lan, L. T. Vinh, N. V. Hong
      Abstract: Modern Physics Letters B, Ahead of Print.
      Molecular dynamics (MD) simulations and visualizations were explored to investigate the changes in structure of liquid aluminosilicates. The models were constructed for four compositions with varying Al2O3/SiO2 ratio. The local structure and network topology was analyzed through the pair of radial distribution functions, bond angle, bond length and coordination number distributions. The results showed that the structure of aluminosilicates mainly consists of the basic structural units TO[math] (T is Al or Si; y = 3, 4, 5). Two adjacent units TO[math] are linked to each other through common oxygen atoms and form continuous random network of basic structural units TO[math]. The bond statistics (corner-, edge- and face- sharing) between two adjacent TO[math] units are investigated in detail. The self-diffusion coefficients for three atomic types are affected by the degree of polymerization (DOP) of network characterized by the proportions of nonbridging oxygen (NBO) and Q[math] species in the system. It was found that Q4 and Q3 tetrahedral species (tetrahedron with four and three bridging oxygens, respectively) decreases, while Q0 (with four nonbridging oxygen) increase with increasing Al2O3/SiO2 molar ratio, suggesting that a less polymerized network was formed. The structural and dynamical heterogeneities, micro-phase separation and liquid–liquid phase transition are also discussed in this work.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-16T09:24:12Z
      DOI: 10.1142/S0217984917500361
       
  • Dielectric properties of [math]–[math] composite ceramics
    • Authors: Jing Wang, Haiyan Cheng, Lan Gao, Xianling wang, Ruijie Duan, Jiali Li
      Abstract: Modern Physics Letters B, Ahead of Print.
      The ceramics with the composition of [math]–[math] (NBT–BMST) in which [math] = 0.2, 0.3, 0.4 and 0.5 were prepared successfully by the solid-state reaction method. The effects of NBT-doping on phase structure, morphology, temperature stability and dielectric properties had been investigated in detail. The XRD results show that the composites are composed of tetragonal perovskite. The phase structure of NBT–BMST is observed by scanning electron microscopy. The dielectric constant of [math]–[math] ceramic is [math][math]4100, the temperature coefficients of capacitance are −15%, 15% and 22% at −55[math]C, 60[math]C and 200[math]C, respectively. And the dielectric loss is less than 0.13, which is obviously superior to other compositions. The results of this work showed that the component of [math]–[math] is a promising candidate to high-temperature stable materials.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-16T09:24:12Z
      DOI: 10.1142/S0217984917500440
       
  • A hybrid queuing strategy for network traffic on scale-free networks
    • Authors: Kai-Quan Cai, Lu Yu, Yan-Bo Zhu
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, a hybrid queuing strategy (HQS) is proposed in traffic dynamics model on scale-free networks, where the delivery priority of packets in the queue is related to their distance to destination and the queue length of next jump. We compare the performance of the proposed HQS with that of the traditional first-in-first-out (FIFO) queuing strategy and the shortest-remaining-path-first (SRPF) queuing strategy proposed by Du et al. It is observed that the network traffic efficiency utilizing HQS with suitable value of parameter h can be further improved in the congestion state. Our work provides new insights for the understanding of the networked-traffic systems.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-15T09:37:42Z
      DOI: 10.1142/S021798491750083X
       
  • A note on the electromagnetic irradiation in a holed
           spatial region: A space-time approach
    • Authors: Luiz C. L. Botelho
      Abstract: Modern Physics Letters B, Ahead of Print.
      We study the role of the homological topological property of a space-time with holes (a multiple connected manifold) on the formal solution of the electromagnetic irradiation problem taking place on these “holed” space-times. In this paper, in addition to the main focus of study, we present as well important studies on this irradiation problem on other mathematical frameworks.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-15T08:03:09Z
      DOI: 10.1142/S0217984917500397
       
  • The influence of atomic dipole–dipole interaction on the dynamics
           of the population inversion and entanglement of two atoms interacting
           non-resonantly with two coupled modes field
    • Authors: Elham Faraji, Hamid Reza Baghshahi, Mohammad Kazem Tavassoly
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this paper, the non-resonant interaction of two two-level atoms with two quantized cavity fields is studied by considering the dipole–dipole interaction between the two atoms. The correlation between the fields has been taken into account and the parametric down conversion is considered. Under certain initial conditions which is determined for the atoms and the fields, the analytical solution for the time-dependent Shrödinger equation is obtained. Employing this solution, we are able to discuss about some physical properties such as atomic population inversion and entanglement between various subsystems, i.e. “atoms–fields” and “atom–atom” by using respectively von Neumann entropy and negativity. It is deduced from the numerical results that, the mentioned quantities can be controlled by the atomic dipole–dipole interaction and detuning parameter, appropriately. The results show that the degree of entanglement between the two atoms is increased due to the presence of dipole–dipole coupling of the atoms at the beginning of atom–field interaction. Furthermore, it is found that, in the non-resonance condition, the so-called entanglement sudden death occurs in the presence of dipole–dipole interaction.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-15T08:03:06Z
      DOI: 10.1142/S0217984917500385
       
  • An assembly method for micro parts jointing with given space angle based
           on projection matching
    • Authors: Lie Bi, Wenrong Wu, Juan Zhang, Honggang Yang
      Abstract: Modern Physics Letters B, Ahead of Print.
      It is difficult to assemble micro parts jointing with given space angle as the parts assembled are not on the same flat and the visual depth of microscopic vision is small, which can cause the images gathered by the microscopic vision unintelligible and feature extraction difficult. For the problem, this paper presents an assembly method of micro parts based on projection matching. It can assemble micro parts jointing with given space angle accurately. Firstly, an ideal assembly model is established as the size of the micro parts through the drawing software. Secondly, a graphics algorithm based on the primitive information from CAD is designed. Thirdly, according to the pixel value calibration and the graphics algorithm, the projection pictures are shown on the control interface. Lastly, the control method of micro parts is proposed to assemble them with given space angle. And we accomplished an assembly experiment of micro-tube and micro-column in this way, whose assembly deviation is 0.12[math]. Experiment results indicate that the angle between two micro parts assembled can be controlled within the given deviation.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-13T09:46:25Z
      DOI: 10.1142/S0217984917500415
       
  • Structural characterization of Zn–In–Se thin films
    • Authors: H. H. Güllü, M. Parlak
      Abstract: Modern Physics Letters B, Ahead of Print.
      In this study, structural properties of the Zn–In–Se (ZIS) thin films deposited by thermal evaporation method were investigated. The as-grown and annealed ZIS films were found in polycrystalline structure with the main orientation in (112) direction. The compositional analysis of the films showed that they were in Zn-rich behavior and there was a slight change in the elemental contribution to the structure with annealing process. Raman analysis was carried out to determine the crystalline structure and the different vibration modes of ZIS thin films. According to these measurements, the highest Raman intensity was in the LO mode which was directly proportional to the crystallinity of the samples. The atomic force microscopy (AFM) analyses were done in order to obtain detailed information about the morphology of the thin film surface. The surface of the films was observed as nearly-smooth and uniform in as-grown and annealed forms. X-ray photoelectron spectroscopy (XPS) measurements were analyzed to get detailed information about surface and near-surface characteristics of the films. The results from the surface and depth compositional analyses of the films showed quite good agreement with the energy dispersive X-ray spectroscopy (EDS) analysis.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-13T09:46:24Z
      DOI: 10.1142/S0217984917500439
       
  • Design and analysis of miniature tri-axial fluxgate magnetometer
    • Authors: Menghui Zhi, Liang Tang, Donghai Qiao
      Abstract: Modern Physics Letters B, Ahead of Print.
      The detection technology of weak magnetic field is widely used in Earth resource survey and geomagnetic navigation. Useful magnetic field information can be obtained by processing and analyzing the measurement data from magnetic sensors. A miniature tri-axial fluxgate magnetometer is proposed in this paper. This miniature tri-axial fluxgate magnetometer with ring-core structure has a dynamic range of the Earth’s field ±[math]65,000 nT, resolution of several nT. It has three independent parts placed in three perpendicular planes for measuring three orthogonal magnetic field components, respectively. A field-programmable gate array (FPGA) is used to generate stimulation signal, analog-to-digital (A/D) convertor control signal, and feedback digital-to-analog (D/A) control signal. Design and analysis details are given to improve the dynamic range, sensitivity, resolution, and linearity. Our prototype was measured and compared with a commercial standard Magson fluxgate magnetometer as a reference. The results show that our miniature fluxgate magnetometer can follow the Magson’s change trend well. When used as a magnetic compass, our prototype only has [math] deviation compared with standard magnetic compass.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-13T07:38:08Z
      DOI: 10.1142/S0217984917500403
       
  • Ehrlich–Schwöbel barriers and adsorption of Au, Cu and Ag
           stepped (100) surfaces
    • Authors: M. Benlattar, E. Elkoraychy, K. Sbiaai, M. Mazroui, Y. Boughaleb
      Abstract: Modern Physics Letters B, Ahead of Print.
      We use a combination of quenched molecular dynamics and embedded atom method to calculate the activation energy barriers for the hopping and exchange mechanisms of Au, Ag or Cu on Au(100), Ag(100) or Cu(100) stepped surfaces. Our findings show that the Ehrlich–Schwöbel (ES) barriers for an adatom to undergo jump or exchange at a step edge are found to be dependent of the nature of substrate stepped surfaces. We also find that the ES barriers for the hopping processes are too high, except for Cu/Au(100). While for exchange process the Ehrlich–Schwöbel barriers are found to be very low and even negative. These ES barriers can explain the difference in the growth modes for the different systems. On the other hand, we calculated the adsorption energies at the most stable adsorption sites near step edges. In particular, we wish to clarify the relation between the adatom diffusion energy barriers and the adatom adsorption energies. These results may serve as some guiding rules for studying stepped surface morphologies, which are of importance to surface nanoengineering.
      Citation: Modern Physics Letters B
      PubDate: 2017-02-13T07:38:05Z
      DOI: 10.1142/S0217984917500373
       
 
 
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