Observation of finite excess noise in the voltage-biased quantum Hall regime as a precursor for breakdown
arXiv:1211.6228 · doi:10.1103/PhysRevB.87.155313
Abstract
We performed noise measurements in a two-dimensional electron gas to investigate the nonequilibrium quantum Hall effect (QHE) state. While excess noise is perfectly suppressed around the zero-biased QHE state reflecting the dissipationless electron transport of the QHE state, considerable finite excess noise is observed in the breakdown regime of the QHE. The noise temperature deduced from the excess noise is found to be of the same order as the energy gap between the highest occupied Landau level and the lowest empty one. Moreover, unexpected finite excess noise is observed at a finite source-drain bias voltagesmaller than the onset voltage of the QHE breakdown, which indicates finite dissipation in the QHE state and may be related to the prebreakdown of the QHE.
8 pages, 8 figures
References in corpus (9)
- Direct measurement of the coherence length of edge states in the Integer Quantum Hall Regime
- Dephasing in the electronic Mach-Zehnder interferometer at filling factor 2
- Decoherence and single electron charging in an electronic Mach-Zehnder interferometer
- Tuning Energy Relaxation along Quantum Hall Channels
- Edge-State Velocity and Coherence in a Quantum Hall Fabry-Perot Interferometer
- Edge Channel Interference Controlled by Landau Level Filling
- A system for measuring auto- and cross-correlation of current noise at low temperatures
- Nonequilibrium Dephasing in an Electronic Mach-Zehnder Interferometer
- Universality of Bias- and Temperature-induced Dephasing in Ballistic Electronic Interferometers