Wednesday, June 5, 2013

1306.0840 (Prasenjit Dutt et al.)

Strongly-Correlated Thermoelectric Transport beyond Linear Response    [PDF]

Prasenjit Dutt, Karyn Le Hur
We investigate nonlinear thermoelectric transport through quantum impurity systems with strong on-site interactions. We show that the steady-state transport through interacting quantum impurities in contact with electron reservoirs at significantly different temperatures can be captured by an effective-equilibrium density matrix, expressed compactly in terms of the Lippmann-Schwinger operators of the system. In addition, the reservoirs can be maintained at arbitrary chemical potentials. The interplay between the temperature gradient and bias voltage gives rise to a non-trivial breaking of particle-hole symmetry in the strongly correlated regime, manifest in the Abrikosov-Suhl localized electron resonance. This purely many-body effect, which is in agreement with experimental results, does not arise from mean-field arguments and for weak-interactions.
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