A variational polaron method is developed for nonequilibrium quantum heat transport that treats infrared divergence in Ohmic baths and includes cross-bath correlations, yielding more accurate heat currents than the NIBA approach.
Zero-temperature Localization in a Sub-Ohmic Spin-Boson Model Investigated by an Extended Hierarchy Equation of Motion, Phys
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A Nonequilibrium Variational Polaron Theory to Study Quantum Heat Transport
A variational polaron method is developed for nonequilibrium quantum heat transport that treats infrared divergence in Ohmic baths and includes cross-bath correlations, yielding more accurate heat currents than the NIBA approach.