| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Dissipation-Driven Superradiant Phase Transition of a Two-Dimensional Bose–Einstein Condensate in a Double Cavity |
| Bo-Hao Wu1,2, Xin-Xin Yang1,2, Yu Chen3*, and Wei Zhang1,2,4* |
1Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China
2Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education), Renmin University of China, Beijing 100872, China
3Graduate School of China Academy of Engineering Physics, Beijing 100193, China
4Beijing Academy of Quantum Information Sciences, Beijing 100193, China
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| Cite this article: |
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Bo-Hao Wu, Xin-Xin Yang, Yu Chen et al 2024 Chin. Phys. Lett. 41 064201 |
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Abstract We study superradiant phase transitions in a hybrid system of a two-dimensional Bose–Einstein condensate of atoms and two cavities arranged with a tilt angle. By adjusting the loss rate of cavities, we map out the phase diagram of steady states within a mean field framework. It is found that when the loss rates of the two cavities are different, superradiant transitions may not occur at the same time in the two cavities. A first-order phase transition is observed between the states with only one cavity in superradiance and both in superradiance. In the case that both cavities are superradiant, a net photon current is observed flowing from the cavity with small decay rate to the one with large decay rate. The photon current shows a non-monotonic dependence on the loss rate difference, owing to the competition of photon number difference and cavity field phase difference. Our findings can be realized and detected in experiments.
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Received: 20 February 2024
Published: 03 June 2024
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| PACS: |
42.50.Pq
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(Cavity quantum electrodynamics; micromasers)
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67.85.-d
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(Ultracold gases, trapped gases)
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05.30.Jp
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(Boson systems)
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