Thermal conductance at superradiant phase transition in quantum Rabi model

• URL: http://arxiv.org/abs/2502.14447v1
• Date: Thu, 20 Feb 2025 11:00:37 GMT
• Title: Thermal conductance at superradiant phase transition in quantum Rabi model
• Authors: Tsuyoshi Yamamoto, Yasuhiro Tokura,
• Abstract summary: The quantum Rabi model exhibits a superradiant phase transition when the coupling becomes strong. This phase transition is referred to as a few-body quantum phase transition, in contrast to conventional phase transitions in many-body systems.
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• Abstract: The quantum Rabi model exhibits a superradiant phase transition when the coupling becomes strong, even though it involves only two components: a two-level atom and a single bosonic mode. This phase transition is referred to as a few-body quantum phase transition, in contrast to conventional phase transitions in many-body systems. In this work, we investigate heat transport across an atom embedded in bosonic modes, modeled by the quantum Rabi model, between two thermal baths. We found a manifestation of the superradiant phase transition in the thermal conductance, which represents the linear response to a temperature bias. Our work can be helpful for the development of quantum heat devices utilizing controllable few-body phase transitions.

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