Charge metastability and hysteresis in the quantum Hall regime
Abstract
We report simultaneous quasi-dc magnetotransport and high-frequency surface acoustic wave measurements on bilayer two-dimensional electron systems in GaAs. Near strong integer quantized Hall states, a strong magnetic-field-sweep hysteresis in the velocity of the acoustic waves is observed at low temperatures. This hysteresis indicates the presence of a metastable state with anomalously high conductivity in the interior of the sample. This nonequilibrium state is not revealed by conventional low-frequency transport measurements which are dominated by dissipationless transport at the edge of the two-dimensional system. We find that a field-cooling technique allows the equilibrium charge configuration within the interior of the sample to be established. A simple model for this behavior is discussed.
Additional Information
© 2016 American Physical Society. (Received 7 October 2016; published 29 December 2016) We thank E. H. Fradkin, B. I. Halperin, H. R. Krishnamurthy, M. Shayegan, S. H. Simon, J. C. W. Song, and A. Stern for discussions. The Caltech portion of this work was supported by NSF Grant No. DMR-0070890, DOE Grant No. FG02-99ER45766, and the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation through Grant No. GBMF1250. The work at Princeton University was funded by the Gordon and Betty Moore Foundation through the EPiQS initiative Grant No. GBMF4420, and by the National Science Foundation MRSEC Grant No. DMR-1420541.Attached Files
Published - PhysRevB.94.245440.pdf
Submitted - 1610.02386v1.pdf
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Additional details
- Eprint ID
- 72582
- Resolver ID
- CaltechAUTHORS:20161206-075018469
- DMR-0070890
- NSF
- FG02-99ER45766
- Department of Energy (DOE)
- Institute for Quantum Information and Matter (IQIM)
- GBMF1250
- Gordon and Betty Moore Foundation
- GBMF2719
- Gordon and Betty Moore Foundation
- DMR-1420541
- NSF
- Created
-
2016-12-06Created from EPrint's datestamp field
- Updated
-
2021-11-11Created from EPrint's last_modified field
- Caltech groups
- Institute for Quantum Information and Matter