Heat transport in the quantum Rabi model: Universality and ultrastrong coupling effects

• URL: http://arxiv.org/abs/2403.06909v2
• Date: Fri, 15 Mar 2024 08:50:19 GMT
• Title: Heat transport in the quantum Rabi model: Universality and ultrastrong coupling effects
• Authors: L. Magazzù, E. Paladino, M. Grifoni,
• Abstract summary: Heat transport in the quantum Rabi model at weak interaction with the heat baths is controlled by the qubit-oscillator coupling. Universality of the linear conductance versus the temperature is found for $Tlesssim T_K$, with $T_K$ a coupling-dependent Kondo-like temperature.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Heat transport in the quantum Rabi model at weak interaction with the heat baths is controlled by the qubit-oscillator coupling. Universality of the linear conductance versus the temperature is found for $T\lesssim T_K$, with $T_K$ a coupling-dependent Kondo-like temperature. At low temperature, coherent heat transfer via virtual processes yields a $\sim T^3$ behavior with destructive interference in the presence of quasi-degeneracies in the spectrum. As the temperature increases, incoherent emission and absorption dominate and a maximum is reached at $T\sim T_K/2$. In the presence of a bias on the qubit, the conductance makes a transition from a resonant to a broad, zero-bias peak regime. Parallels and differences are found compared to the spin-boson model in [K. Saito and T. Kato, Phys. Rev. Lett. \textbf{111}, 214301 (2013)], where the qubit-bath coupling instead of the internal qubit-oscillator coupling rules thermal transport.

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