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.
![[thumbnail of 1314527.pdf]](https://discovery.ucl.ac.uk/style/images/fileicons/application_pdf.png) Preview |
PDF
1314527.pdf Download (411kB) |
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 UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1314527 |
Archive Staff Only
 |
View Item |
