Temperature dependence of conductance and thermopower anomalies of quantum point contacts |
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Authors: | O A Tkachenko V A Tkachenko |
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Institution: | 1. Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, pr. Lavrentieva 13, Novosibirsk, 630090, Russia
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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. |
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