Spin-dependent thermoelectric transport coefficients in near-perfect quantum wires

Details Spin-dependent thermoelectric transport coefficients in near-perfect quantum wires Spin-dependent thermoelectric transport coefficients in near-perfect quantum wires

2002-03-29

arxiv.org/abs/cond-mat/0203608v1

Phys. Rev. B 65, 235301 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Phys. Rev. B 2002; 3 figures

Scientific paper

10.1103/PhysRevB.65.235301

Thermoelectric transport coefficients are determined for semiconductor quantum wires with weak thickness fluctuations. Such systems exhibit anomalies in conductance near 1/4 and 3/4 of 2e^2/h on the rising edge to the first conductance plateau, explained by singlet and triplet resonances of conducting electrons with a single weakly bound electron in the wire [T. Rejec, A. Ramsak, and J.H. Jefferson, Phys. Rev. B 62, 12985 (2000)]. We extend this work to study the Seebeck thermopower coefficient and linear thermal conductance within the framework of the Landauer-Buettiker formalism, which also exhibit anomalous structures. These features are generic and robust, surviving to temperatures of a few degrees. It is shown quantitatively how at elevated temperatures thermal conductance progressively deviates from the Wiedemann-Franz law.

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