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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2004     Display Documents

ID: 192803.0, MPI für Festkörperforschung / FKF Publikationen 2004
Long time relaxation phenomena of a two-dimensional electron system within integer quantum Hall plateau regimes after magnetic field sweeps
Authors:Huels, J.; Weis, J.; Smet, J.; von Klitzing, K.; Wasilewski, Z. R.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Physical Review B
Issue / Number:8
Sequence Number of Article:085319
Review Status:not specified
Audience:Not Specified
Abstract / Description:For investigating a two-dimensional electron system (2DES) in high
magnetic fields and at temperatures below 0.1 K a single electron
transistor (SET) is directly fabricated on top of a GaAs/AlGaAs
heterostructure containing the 2DES underneath the surface. By using
the SET as a highly sensitive electrostatic potential probe, the
variation of the local electrostatic potential in the 2DES under the
SET can be observed. Sweeping the magnetic field over a Hall plateau
regime, a characteristic hysteresislike dependence of the local
electrostatic potential between up and down sweep is observed
indicating a nonequilibrium state for the 2DES. Stopping the magnetic
field in a Hall plateau regime, the relaxation of the nonequilibrium
potential distribution within the 2DES into the thermodynamic
equilibrium at very low temperatures can elapse over several hours. The
hysteresis effect is interpreted as the fingerprints of eddy currents
which are driven by induced electrochemical potential gradients across
the incompressible regions of the 2DES.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
; Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada.
Identifiers:ISI:000220185100069 [ID No:1]
ISSN:1098-0121 [ID No:2]
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