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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 |
1Information Engineer School, Huanghe Science and Technology College, Zhengzhou 450006
2Department of Physics, Jinggangshan University, Ji'an 343009
3Department of Physics, Tsinghua University, Beijing 100084
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| Cite this article: |
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LI Li-Ping, LUO Xiao-Bing, HU Qiang-Lin et al 2013 Chin. Phys. Lett. 30 110501 |
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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.
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Received: 12 August 2013
Published: 30 November 2013
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| PACS: |
05.60.Gg
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(Quantum transport)
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42.82.Et
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(Waveguides, couplers, and arrays)
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03.75.Lm
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(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
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32.80.Qk
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(Coherent control of atomic interactions with photons)
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