PMID: 12786087Jun 6, 2003Paper

Diffusion thermopower of a two-dimensional hole gas in SiGe in a quantum Hall insulating state

Physical Review Letters
C PossanziniJ C Maan

Abstract

Both the temperature dependence of resistivity and thermopower of a two-dimensional hole gas in SiGe show a reentrant metal-insulator transition at filling factor nu=1.5, but with strikingly different behavior of the two coefficients. As the temperature is decreased in the insulating state, the resistivity diverges exponentially while the thermopower decreases rapidly, suggesting that the insulating state is due to the presence of a mobility edge rather than a gap at the Fermi energy.

References

Sep 15, 1995·Physical Review. B, Condensed Matter·V BayotM Shayegan
Jul 15, 1995·Physical Review. B, Condensed Matter·R FletcherY Feng
Dec 15, 1991·Physical Review. B, Condensed Matter·S V KravchenkoV M Pudalov
Oct 15, 1993·Physical Review. B, Condensed Matter·D G Polyakov, B I Shklovskii

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Citations

Aug 8, 2009·Physical Review Letters·Srijit GoswamiArindam Ghosh

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