Steinke, L. and Schuh, D. and Bichler, M. and Abstreiter, G. and Grayson, M. (2008) Hopping conduction in strongly insulating states of a diffusive bent quantum Hall junction. PHYSICAL REVIEW B, 77 (23): 235319. ISSN 1098-0121,
Full text not available from this repository.Abstract
Transport studies of a bent quantum Hall junction at integer filling factor nu show strongly insulating states (nu=1,2) at higher fields. In this paper we analyze the strongly insulating behavior as a function of temperature T and dc bias V(dc) in order to classify the localization mechanisms responsible for the insulating state. The temperature dependence suggests a crossover from activated nearest-neighbor hopping at higher T to variable-range hopping conduction G similar to exp[-(T(0)/T)(1/2)] at lower T. The base temperature electric-field dependence shows I(epsilon)similar to exp[-(epsilon(0)/epsilon)(1/2)], consistent with one-dimensional (1D) variable-range hopping conduction. We observe almost identical behavior at nu=1 and nu=2, and discuss how the bent quantum Hall junction conductance appears to be independent of the bulk spin state. Various models of 1D variable-range hopping, which either include or ignore interactions are compared all of which are consistent with the basic model of disorder coupled counterpropagating quantum Hall edges.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRON-SYSTEM; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Nov 2020 08:07 |
| Last Modified: | 02 Nov 2020 08:07 |
| URI: | https://pred.uni-regensburg.de/id/eprint/30856 |
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