Signatures of an Anomalous Nernst Effect in a Mesoscopic Two-Dimensional Electron System

Details Signatures of an Anomalous Nernst Effect in a Mesoscopic Two-Dimensional Electron System Signatures of an Anomalous Nernst Effect in a Mesoscopic Two-Dimensional Electron System

2010-12-28

arxiv.org/abs/1012.5724v1

Phys. Rev. B 83, 073302 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Accepted for publication in Phys. Rev. B (Brief Reports)

Scientific paper

We investigate the Nernst effect in a mesoscopic two-dimensional electron system (2DES) at low magnetic fields, before the onset of Landau level quantization. The overall magnitude of the Nernst signal agrees well with semi-classical predictions. We observe reproducible mesoscopic fluctuations in the signal which diminish significantly with an increase in temperature. We also show that the Nernst effect exhibits an anomalous component which is correlated with an oscillatory Hall effect. This behavior may be able to distinguish between different spin-correlated states in the 2DES.

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