Enhancement of Localization in a Driven Four-Well System with Second-Order Coupling
LI Li-Ping1,3 , LUO Xiao-Bing2,3** , HU Qiang-Lin2 , YU Xiao-Guang2
1 Information Engineer School, Huanghe Science and Technology College, Zhengzhou 4500062 Department of Physics, Jinggangshan University, Ji'an 3430093 Department of Physics, Tsinghua University, Beijing 100084
Abstract ：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.
收稿日期: 2013-08-12
出版日期: 2013-11-30
:
05.60.Gg
(Quantum transport)
42.82.Et
(Waveguides, couplers, and arrays)
03.75.Lm
(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
32.80.Qk
(Coherent control of atomic interactions with photons)
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2013, Vol. 30 
