Goswami, Srijit ; Siegert, Christoph ; Baenninger, Matthias ; Pepper, Michael ; Farrer, Ian ; Ritchie, David A. ; Ghosh, Arindam (2009) Highly enhanced thermopower in two-dimensional electron systems at Millikelvin temperatures Physical Review Letters, 103 (2). Article ID 026603. ISSN 0031-9007
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Official URL: http://journals.aps.org/prl/abstract/10.1103/PhysR...
Related URL: http://dx.doi.org/10.1103/PhysRevLett.103.026602
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 μV/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.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Physical Society. |
ID Code: | 101549 |
Deposited On: | 01 Feb 2018 10:06 |
Last Modified: | 01 Feb 2018 10:06 |
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