UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

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 and gold open access

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
402Kb

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 publication. A version is also 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 > Electronic and Electrical Engineering

View download statistics for this item

Archive Staff Only: edit this record