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27 April 2024 |
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Possible existence of a band of extended states induced by inter-Landau-band mixing in quantum Hall system | | Gang Xiong
; Shi-Dong Wang
; Qian Niu
; Yupeng Wang
; X. C. Xie
; De-Cheng Tian
; X. R. Wang
; | | Date: |
16 Dec 2005 | | Journal: | J. Phys.: Condens. Matter 18(2006)2029 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | | Abstract: | The mixing of states with {it opposite chirality} in quantum Hall system is shown to have delocalization effect. It is possible that extended states may form bands because of this mixing, as is shown through a numerical calculation on a two-channel network model. Based on this result, a new phase diagram with a narrow {it metallic} phase separating two adjacent QH phases and/or separating a QH phase from the insulating phase is proposed. The data from recent non-scaling experiments is reanalyzed and shown that they seem to be {it consistent} with the new phase diagram. However, due to finite-size effects, further study on large system size is still needed to conclude whether there are extended state bands in thermodynamic limit. | | Source: | arXiv, cond-mat/0512374 | | Services: | Forum | Review | PDF | Favorites | |
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