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26 April 2024 |
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Universal behaviour in the floating up of quantum Hall extended states as B -> 0 | | C. E. Yasin
; M. Y. Simmons
; A. R. Hamilton
; N. E. Lumpkin
; R. G. Clark
; L. N. Pfeiffer
; K. W. West
; | | Date: |
24 Apr 2002 | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Strongly Correlated Electrons | cond-mat.mes-hall cond-mat.str-el | | Abstract: | We investigate the relationship between the quantum Hall extended states and the apparent B=0 `metal’-insulator transition in extremely low density, high quality two-dimensional n-GaAs systems (mu_{peak} ~ 2 x 10^7 cm^2/Vs). The combination of small effective mass and high quality allow us to resolve the continued floating up in energy of the extended states down to very low magnetic fields, B=0.015T, despite an apparent `metal’-insulator transition at B = 0. We present a modified global phase diagram which brings together conflicting data in the literature from different material systems, and reconciles the differences as to the fate of the extended states as B -> 0. | | Source: | arXiv, cond-mat/0204519 | | Services: | Forum | Review | PDF | Favorites | |
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