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Highly Enhanced Thermopower in Two-Dimensional Electron Systems at Millikelvin Temperatures

Goswami, S; Siegert, C; Baenninger, M; Pepper, M; Farrer, I; Ritchie, DA; Ghosh, A; (2009) Highly Enhanced Thermopower in Two-Dimensional Electron Systems at Millikelvin Temperatures. PHYS REV LETT , 103 (2) , Article 026602. 10.1103/PhysRevLett.103.026602. Green open access

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Abstract

We report experimental observation of an unexpectedly large thermopower in mesoscopic two-dimensional (2D) electron systems in GaAs/AlGaAs heterostructures at sub-Kelvin temperatures and zero magnetic field. Unlike conventional nonmagnetic high-mobility 2D systems, the thermopower in our devices increases with decreasing temperature below 0.3 K, reaching values in excess of 100 mu V/K, thus exceeding the free electron estimate by more than 2 orders of magnitude. With support from a parallel study of the local density of states, we suggest such a phenomenon to be linked to intrinsic localized states and many-body spin correlations in the system.

Type: Article
Title: Highly Enhanced Thermopower in Two-Dimensional Electron Systems at Millikelvin Temperatures
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.103.026602
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.103.026602
Language: English
Additional information: © 2009 The American Physical Society
Keywords: THERMOELECTRIC-POWER, TRANSPORT-PROPERTIES, LATTICE, GAS, RESISTIVITY, LOCALIZATION
UCL classification: UCL > School of BEAMS > Faculty of Engineering Science
UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/1314527
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