Highly enhanced thermopower in two-dimensional electron systems at milliKelvin temperatures

Details Highly enhanced thermopower in two-dimensional electron systems at milliKelvin temperatures Highly enhanced thermopower in two-dimensional electron systems at milliKelvin temperatures

2009-06-02

arxiv.org/abs/0906.0445v1

Phys. Rev. Lett., 103, 026602 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

(to appear in Phys. Rev. Lett.)

Scientific paper

We report experimental observation of an unexpectedly large thermopower in mesoscopic two-dimensional (2D) electron systems on GaAs/AlGaAs heterostructures at sub-Kelvin temperatures and zero magnetic field. Unlike conventional non-magnetic 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 two orders of magnitude. With support from a parallel independent 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.

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