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

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

2010-08-09

arxiv.org/abs/1008.1467v2

Phys. Rev. B 83, 045417 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 5 figures

Scientific paper

10.1103/PhysRevB.83.045417

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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