摘要：
We theoretically study the electron transport properties for two coupled single-walled carbon nanotube quantum dots connected to metallic electrodes under the irradiation of an external electromagnetic field at low temperatures. Using the standard nonequilibrium Green's function techniques, we examine the time-averaged transmission coefficient and linear conductance. It is shown that by some numerical examples, the photon-assisted inter-dot coupling causes Fano resonance and the conductance of the system is sensitive to the external field parameters. The transport dependence on the external field parameters may be used to detect the high-frequency microwave irradiation.
作者机构：
[徐志峰] Physics and Information Sciences College, Hunan Normal University, Changsha 410081, China;[徐志峰; 周光辉] Department of Physics, Hunan City College, Yiyang 413000, China
作者机构：
[李天然] Department of Mathematics, Hunan City College, Yiyang, 413000, China;[陈传淼] Institute of Computation, Hunan Normal University, Changsha, 410081, China
摘要：
We introduce a purely anharmonic lattice model with specific double-well on-site potential, which admits traveling compacton-like solitary wave solutions by the inverse method with the help of Mathematica. By properly choosing the shape of the solitary wave solution of the system, we can calculate the parameters of the specific on-site potential. We also found that the localization of the compacton is related to the nonlinear coupling parameter Cnl and the potential parameter V0 of the on-site potential, and the velocity of the propagation of the compacton is determined by the localization parameter q and the potential parameter V0. Numerical calculation results demonstrate that the narrow compacton is unstable while the wide compacton is stable when they move along the lattice chain.
作者机构：
[Xia, QL] Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.;Hunan City Univ, Dept Phys & Elect Sci, Yiyang 413049, Peoples R China.
通讯机构：
[Xia, QL] C;Cent S Univ, Sch Phys Sci & Technol, Changsha 410083, Peoples R China.
关键词：
非线性克莱茵-高登方程;类结致密子;非简谐格子;对称势
摘要：
We study the moving compacton-like kink in the system of a purely anharmonic lattice with symmetric onsite potential by a direct algebraic method. It is found that the localization of the compactons is related to the nonlinear coupling parameter Cnl and the potential barrier height V0 of the double well potential, and the velocity of the propagation of the compacton is determined by the localization parameter q and the potential barrier height V0. Numerical calculation results demonstrate that the compacton is stable when it moves along the lattice chain.
作者机构：
Hunan City Univ, Dept Phys, Yiyang 413049, Peoples R China.;Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.;Hunan Normal Univ, Inst Nonlinear Phys, Changsha 410081, Peoples R China.;[Jiaren Y.; Guanghui Z.] Physics Department, Institute of Nonlinear Physics, Hunan Normal University, Changsha 410081, China;[Liuxian P.] Department of Physics, Hunan City University, Yiyang 413049, China
通讯机构：
[Liuxian, P.] D;Department of Physics, Hunan City University, China
关键词：
KdV-MKdV equation;soliton;perturbation
摘要：
The authors develop a direct approach to the soliton perturbation based on the separation of variables. With the aid of approach, the first-order effects of perturbation on a KdV-MKdV soliton are derived, both the slow time-dependence of the soliton parameters and the first-order correction are obtained.
作者：
PAN Liu-xian 1, ZHOU Guang-hui 2, LI Shu-shen 3(1.Department of Physics, Yiyang Teacher’s College, Yiyang 413049;2. Department of Physics, Hunan Normal University, Changsha 410081;3. National Laboratory for Supperlattice and Microstructure, Chinese
期刊：
原子与分子物理学报,2002年19(1):79-82 ISSN：1000-0364
作者机构：
[PAN Liu-xian 1, ZHOU Guang-hui 2, LI Shu-shen 3(1.Department of Physics, Yiyang Teacher’s College, Yiyang 413049] Department of Physics, Yiyang Teacher's College;[Zhou Guanghui] Department of Physics, Hunan Normal University;[Li Shushen] 中科院半导体所
摘要：
Nonlinear wave equation for a one-dimensional anharmonic crystal lattice in terms of its microscopic parameters is obtained by means of a continuum approximation. Using a small time scale transformation, the nonlinear wave equation is reduced to a combined KdV equation and its single soliton solution yields the supersonic kink form of nonlinear elastic waves for the system.
作者机构：
[潘留仙] Department of Physics, Hunan City College, Yiyang 413049, China;[周光辉] Department of Physics, Physics/Information Science College, Hunan Normal University, Changsha 410081, China;[李乐群] Hunan Propagating Medium Prof. Coll., Changsha 410000, China
作者机构：
[Pan, LX] Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.;Hunan Normal Univ, Inst Nonlinear Phys, Changsha 410081, Peoples R China.;Yiyang Teachers Coll, Dept Phys, Yiyang 413049, Hunan Province, Peoples R China.;China Ctr S Univ, Dept Appl Phys, Changsha 410083, Peoples R China.
通讯机构：
[Pan, LX] H;Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.
关键词：
diamond-structure lattice;nonlinear gap modes;quasi-contimuum approximation
摘要：
We analytically study the nonlinear localized gap modes in a one-dimensional atomic chain with uniform atomic mass but two periodically alternating force constants between the nearest neighbors by means of a quasi-continuum approximation. This model simulates a row of atoms in the (111) direction of a diamond-structure type of crystals or molecular crystals with alternating double and single bonds. For this lattice system, rye find that the harmonic plus quartic anharmonic terms of inter-site potential produce a new type of nonlinear localized gap modes with a slightly asymmetry distribution of atomic displacements. These localized gap modes are somewhat different from widely studied localized gap modes with a symmetry atomic displacement distribution in diatomic ion lattices.
