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

doi:10.1088/1674-1056/19/3/037107

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.

Keywords: delocalization localization one-dimensional chain surrounding atoms

Received: 13 July 2009
Revised: 26 August 2009
Accepted manuscript online:

PACS:	71.55.Jv	(Disordered structures; amorphous and glassy solids)
	71.15.Ap	(Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.))
	73.21.Hb	(Quantum wires)

Fund: 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).

Cite this article:

Zhu Hong-Jun(祝红军) and Xiong Shi-Jie(熊诗杰) Localization and delocalization of a one-dimensional system coupled with the environment 2010 Chin. Phys. B 19 037107

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

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