Enhancement of Localization in a Driven Four-Well System with Second-Order Coupling  

作　　者：LI Li-Ping LUO Xiao-Bing HU Qiang-Lin YU Xiao-Guang 李利平;罗小兵;胡强林;余晓光(Information Engineer School,Huanghe Science and Technology College,Zhengzhou 450006;Department of Physics,Jinggangshan University,Ji'an 343009;Department of Physics,Tsinghua University,Beijing 100084)

机构地区：[1]Information Engineer School,Huanghe Science and Technology College,Zhengzhou 450006 [2]Department of Physics,Jinggangshan University,Ji'an 343009 [3]Department of Physics,Tsinghua University,Beijing 100084

出　　处：《Chinese Physics Letters》2013年第11期29-32,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10965001 and 11165009;the Natural Science Foundation of Jiangxi Province under Grant 2010GQW0033;the Program for New Century Excellent Talents in University of Ministry of Education of China(NCET-13-0836);the Jiangxi Young Scientists Training Plan under Grant No 20112BCB23024;the Key Subject of Atomic and Molecular Physics in Jiangxi Province,Zhengzhou Municipal Science and Technology Development Plan Project(20120409);Huanghe Science and Technology College Natural Science Research Project(KYZR201208).

摘　　要：We study theoretically the effect of second-order coupling(SOC)on the tunneling dynamics in a planar four-well system with only one well periodically modulated.We find that SOC between next-nearest neighboring wells facilitates localization.Due to SOC,the suppression of tunneling occurs over a finite range of parameters,in stark contrast to the normal coherent destruction of tunneling in the nearest-neighbor tight-binding approximation.This counter-intuitive phenomenon of SOC-enhanced localization can be attributed to the existence of a localized Floquet state rather than the degeneracy of quasi-energy levels in such a system.

关 键 词：TUNNELING nearest attributed 

分 类 号：O17[理学—数学]