Goswami, S and Siegert, C and Baenninger, M and Pepper, M and Farrer, I and Ritchie, DA and 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.
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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 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 |
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