Magazzu, Luca and Paladino, E. and Grifoni, M. (2025) Heat transport in the quantum Rabi model: universality and ultrastrong coupling effects. QUANTUM SCIENCE AND TECHNOLOGY, 10 (2): 025013. ISSN 2058-9565
Full text not available from this repository. (Request a copy)Abstract
Heat transport in a qubit-oscillator junction described by the quantum Rabi model is investigated. Upon variation of temperature, bias on the qubit and the qubit-oscillator coupling strength, a rich variety of effects is identified. For weak coupling to bosonic heat baths, transport is essentially controlled by the qubit-oscillator coupling g which defines a Kondo-like temperature TK(g). At temperatures much lower than TK, coherent heat transfer via virtual processes yields a T3 behavior in the linear conductance as a function of T, modulated by a prefactor determined by the junction parameters and unravelling its multilevel nature. In particular, a coherent suppression of the conductance arises in the presence of quasi-degeneracies in the spectrum. For T greater than or similar to TK, sequential processes dominate heat transfer and a scaling regime is found when quantities are scaled with TK. The conductance as a function of the bias on the qubit undergoes a transition from a resonant behavior at weak qubit-resonator coupling to a broadened, zero-bias peak regime at ultrastrong coupling.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | quantum transport; ultrastrong coupling; open quantum systems |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Jul 2026 09:49 |
| Last Modified: | 15 Jul 2026 09:49 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66593 |
Actions (login required)
 |
View Item |
