Transport properties of a ladder with two random dimer chains

doi:10.1088/1674-1056/20/1/017104

Abstract We investigate the transport properties of a ladder with two random dimer (RD) chains. It is found that there are two extended states in the ladder with identical RD chains and a critical state regarded as an extended state in the ladder with pairing RD chains. Such a critical state is caused by the chiral symmetry. The ladder with identical RD chains can be decoupled into two isolated RD chains and the ladder with pairing RD chains can not. The analytic expressions of the extended states are presented for the ladder with identical RD chains.

Keywords: localization in disordered structures extended states chiral symmetry

Received: 05 May 2010
Revised: 25 July 2010
Accepted manuscript online:

PACS:	71.23.An	(Theories and models; localized states)
	73.20.Jc	(Delocalization processes)
	73.20.Fz	(Weak or Anderson localization)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 70471084 and 10775071).

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Hu Dong-Sheng(胡冬生),Zhu Chen-Ping(朱陈平),and Zhang Yong-Mei(张永梅) Transport properties of a ladder with two random dimer chains 2011 Chin. Phys. B 20 017104

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Transport properties of a ladder with two random dimer chains

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