中国物理B ›› 2011, Vol. 20 ›› Issue (1): 17104-017104.doi: 10.1088/1674-1056/20/1/017104

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Transport properties of a ladder with two random dimer chains

胡冬生, 朱陈平, 张永梅   

  1. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
  • 收稿日期:2010-05-05 修回日期:2010-07-25 出版日期:2011-01-15 发布日期:2011-01-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 70471084 and 10775071).

Transport properties of a ladder with two random dimer chains

Hu Dong-Sheng(胡冬生),Zhu Chen-Ping(朱陈平),and Zhang Yong-Mei(张永梅)   

  1. College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
  • Received:2010-05-05 Revised:2010-07-25 Online:2011-01-15 Published:2011-01-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 70471084 and 10775071).

摘要: 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.

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.

Key words: localization in disordered structures, extended states, chiral symmetry

中图分类号:  (Theories and models; localized states)

  • 71.23.An
73.20.Jc (Delocalization processes) 73.20.Fz (Weak or Anderson localization)