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Correlated electron current and temperature dependence of the conductance of a quantum point contact

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arxiv cond-mat/0606649 v2 pith:CYFRXG7Z submitted 2006-06-26 cond-mat.mes-hall cond-mat.str-el

Correlated electron current and temperature dependence of the conductance of a quantum point contact

classification cond-mat.mes-hall cond-mat.str-el
keywords conductancecontactelectronelectronsenhancedinteractionpointquantum
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate finite temperature corrections to the Landauer formula due to electron-electron interaction within the quantum point contact. When the Fermi level is close to the barrier height, the interaction is strongly enhanced due to semiclassical slowing of the electrons. To describe electron transport we formulate and solve a nonlocal kinetic equation for the density matrix of electrons. The correction to the conductance $G$ is negative and strongly enhanced in the region 0.5*2e^2/h < G < 1*2e^2/h . Our results for conductance agree with the so-called ``0.7 structure'' observed in experiments..

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