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24 April 2024 |
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Observation of finite excess noise in the voltage-biased quantum Hall regime as a precursor for breakdown | | Kensaku Chida
; Tomonori Arakawa
; Sadashige Matsuo
; Yoshitaka Nishihara
; Takahiro Tanaka
; Daichi Chiba
; Teruo Ono
; Tokuro Hata
; Kensuke Kobayashi
; Tomoki Machida
; | | Date: |
27 Nov 2012 | | 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,
supporting the idea that avalanche-type electron heating occurs. Moreover,
unexpected finite excess noise is observed at a finite source-drain bias
voltage smaller than the onset voltage of the QHE breakdown, which may be
called the "precursor regime." The excess noise in this precursor regime is
reproducibly observed at different filling factors and cooling downs. In
addition, it shows unique temporal variation on a time scale of ten minutes.
Such a slow dynamics of the excess noise in the precursor regime is proposed to
originate from the electron tunneling between the edge states and the localized
bulk states. | | Source: | arXiv, 1211.6228 | | Services: | Forum | Review | PDF | Favorites | |
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