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The decay of induced eddy currents in a two-dimensional electron system

The decay of induced eddy currents in a two-dimensional electron system
The decay of induced eddy currents in a two-dimensional electron system
Large long-lived eddy currents are induced in a two-dimensional electron system as the magnetic field is swept through the almost dissipationless states associated with the quantum Hall effect. We have measured the temperature dependence of the decay times of these currents in a GaAs/AlGaAs single heterostructure, using a torque magnetometer at dilution refrigerator temperatures. At Landau-level filling factor nu = 4, the decay time is less than a minute at T = 40 mK, whereas at nu = 1 and 2 we observe a decay time of about four hours which follows a short initial decay of the order of minutes. We discuss the possible mechanisms for decay of the currents and conclude that the energy is stored predominantly in the Hall electric field between the edge and the centre of the sample. At T = 40 mK we estimate a 2D resistivity of the order of 10-14 ohms per square for nu = 1 and 10-11 ohms per square for nu = 4.
409-413
Jones, C L
091c4f5c-15fb-4075-b24a-b4e4bf850fc6
Usher, A
7fa32e15-46fe-473f-969c-74fe3a560571
Elliott, M
e41e3761-c062-47b1-9ac6-6356aad58e74
Herrenden-Harker, W G
59f598ad-2d22-4c98-9a4b-bd2eb260eab2
Potts, A
a3c70ecc-a6ad-4a82-b871-0303479b1020
Shepherd, R
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Cheng, T S
ecf4aac0-69c9-48dc-b45c-cc6441299104
Foxon, C T
29eb7039-5476-4cee-aa99-2a5a7126dc1b
Jones, C L
091c4f5c-15fb-4075-b24a-b4e4bf850fc6
Usher, A
7fa32e15-46fe-473f-969c-74fe3a560571
Elliott, M
e41e3761-c062-47b1-9ac6-6356aad58e74
Herrenden-Harker, W G
59f598ad-2d22-4c98-9a4b-bd2eb260eab2
Potts, A
a3c70ecc-a6ad-4a82-b871-0303479b1020
Shepherd, R
8c8973d7-4047-443f-a8b9-5453914bad8d
Cheng, T S
ecf4aac0-69c9-48dc-b45c-cc6441299104
Foxon, C T
29eb7039-5476-4cee-aa99-2a5a7126dc1b

Jones, C L, Usher, A, Elliott, M, Herrenden-Harker, W G, Potts, A, Shepherd, R, Cheng, T S and Foxon, C T (1995) The decay of induced eddy currents in a two-dimensional electron system. Solid State Communications, 95 (7), 409-413.

Record type: Article

Abstract

Large long-lived eddy currents are induced in a two-dimensional electron system as the magnetic field is swept through the almost dissipationless states associated with the quantum Hall effect. We have measured the temperature dependence of the decay times of these currents in a GaAs/AlGaAs single heterostructure, using a torque magnetometer at dilution refrigerator temperatures. At Landau-level filling factor nu = 4, the decay time is less than a minute at T = 40 mK, whereas at nu = 1 and 2 we observe a decay time of about four hours which follows a short initial decay of the order of minutes. We discuss the possible mechanisms for decay of the currents and conclude that the energy is stored predominantly in the Hall electric field between the edge and the centre of the sample. At T = 40 mK we estimate a 2D resistivity of the order of 10-14 ohms per square for nu = 1 and 10-11 ohms per square for nu = 4.

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Published date: August 1995
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 252890
URI: http://eprints.soton.ac.uk/id/eprint/252890
PURE UUID: 93ab221c-a660-4456-887a-910e3e88afa3

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Date deposited: 30 Mar 2000
Last modified: 10 Dec 2021 20:30

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Contributors

Author: C L Jones
Author: A Usher
Author: M Elliott
Author: W G Herrenden-Harker
Author: A Potts
Author: R Shepherd
Author: T S Cheng
Author: C T Foxon

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