中国物理B ›› 2010, Vol. 19 ›› Issue (3): 37107-037107.doi: 10.1088/1674-1056/19/3/037107

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Localization and delocalization of a one-dimensional system coupled with the environment

祝红军, 熊诗杰   

  1. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
  • 收稿日期:2009-07-13 修回日期:2009-08-26 出版日期:2010-03-15 发布日期:2010-03-15
  • 基金资助:
    Project supported by the State Key Programs for Basic Research of China (Grant Nos.~2005CB623605 and 2006CB921803), and by the National Natural Science Foundation of China (Grant Nos.~60676056 and 10874071).

Localization and delocalization of a one-dimensional system coupled with the environment

Zhu Hong-Jun(祝红军)† and Xiong Shi-Jie(熊诗杰)   

  1. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
  • Received:2009-07-13 Revised:2009-08-26 Online:2010-03-15 Published:2010-03-15
  • Supported by:
    Project supported by the State Key Programs for Basic Research of China (Grant Nos.~2005CB623605 and 2006CB921803), and by the National Natural Science Foundation of China (Grant Nos.~60676056 and 10874071).

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摘要： We investigate several models of a one-dimensional chain coupling with surrounding atoms to elucidate disorder-induced delocalization in quantum wires, a peculiar behaviour against common wisdom. We show that the localization length is enhanced by disorder of side sites in the case of strong disorder, but in the case of weak disorder there is a plateau in this dependence. The above behaviour is the conjunct influence of the coupling to the surrounding atoms and the antiresonant effect. We also discuss different effects and their physical origin of different types of disorder in such systems. The numerical results show that coupling with the surrounding atoms can induce either the localization or delocalization effect depending on the values of parameters.

Abstract: We investigate several models of a one-dimensional chain coupling with surrounding atoms to elucidate disorder-induced delocalization in quantum wires, a peculiar behaviour against common wisdom. We show that the localization length is enhanced by disorder of side sites in the case of strong disorder, but in the case of weak disorder there is a plateau in this dependence. The above behaviour is the conjunct influence of the coupling to the surrounding atoms and the antiresonant effect. We also discuss different effects and their physical origin of different types of disorder in such systems. The numerical results show that coupling with the surrounding atoms can induce either the localization or delocalization effect depending on the values of parameters.

Key words: delocalization, localization, one-dimensional chain, surrounding atoms

中图分类号:  (Disordered structures; amorphous and glassy solids)

  • 71.55.Jv
71.15.Ap (Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.)) 73.21.Hb (Quantum wires)