This article is cited in 7 papers

CONDENSED MATTER

Temperature dependence of conductance and thermopower anomalies of quantum point contacts

O. A. Tkachenko, V. A. Tkachenko

A. V. Rzhanov Institute of Semiconductor Physics of SB RAS, Novosibirsk

Abstract: It has been shown within the Landauer approach that the presence of the $0.7$ anomaly in the conductance of a ballistic microcontact and the respective plateau in the thermopower implies pinning of the potential barrier height at a depth of k B T below the Fermi level. A simple way of taking into account the effect of electron-electron interaction on the profile and temperature dependence of a smooth one-dimensional potential barrier in the lower subband of the microcontact has been proposed. The calculated temperature dependences of the conductance and Seebeck coefficient agree with the experimental gate-voltage dependences, including the emergence of anomalous plateaus with an increase in temperature.

Received: 11.09.2012
Revised: 29.10.2012

 English version: Journal of Experimental and Theoretical Physics Letters, 2012, 96:11, 719–723

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