Thermal conductance in a spin-boson model: Cotunneling and low-temperature properties

Tomi Ruokola and Teemu Ojanen
Phys. Rev. B 83, 045417 – Published 25 January 2011

Abstract

Bosonic thermal transport through a two-level system is analyzed at temperatures below and comparable to the two-level energy splitting. It is shown that in the low-temperature regime transport is dominated by correlated two-boson processes analogous to electron cotunneling in quantum dots under Coulomb blockade. We present a detailed analysis of the sequential-cotunneling crossover and obtain essentially an analytic description of the transport problem. Perturbative analysis is complemented by employing scaling properties of the Ohmic spin-boson model, allowing us to extract an anomalous low-temperature scaling of thermal conductance.

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  • Received 9 August 2010

DOI:https://doi.org/10.1103/PhysRevB.83.045417

© 2011 American Physical Society

Authors & Affiliations

Tomi Ruokola1,* and Teemu Ojanen2

  • 1Department of Applied Physics, Aalto University, P.O. Box 11100, FIN-00076 Aalto, Finland
  • 2Low Temperature Laboratory, Aalto University, P.O. Box 15100, FIN-00076 Aalto, Finland

  • *tomi.ruokola@tkk.fi

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Vol. 83, Iss. 4 — 1 January 2011

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