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

Abstract

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.

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

References in corpus (1)

• Thermoelectric effects in Kondo correlated quantum dots

Cited by in corpus (11)

• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• Spin-thermopower in interacting quantum dots
• Conductance anomalies and the extended Anderson model for nearly perfect quantum wires
• Effect of assisted hopping on thermopower in an interacting quantum dot
• Spin-dependent thermoelectric effects in transport through a nanoscopic junction involving spin impurity
• Shot noise reduction in quantum wires with "0.7 structure"
• Spin-spin correlations of entangled qubit pairs in the Bohm interpretation of quantum mechanics
• Entanglement of electron pairs extracted from a many-body system
• Geometrical view of quantum entanglement
• Geometric analysis of entangled qubit pairs
• Entanglement and transport anomalies in nanowires