| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Nonlinear Dicke Quantum Phase Transition and Its Quantum Witness in a Cavity-Bose–Einstein-Condensate System |
| Wang-Jun Lu, Zhen Li, Le-Man Kuang** |
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control (Ministry of Education), Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081
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| Cite this article: |
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Wang-Jun Lu, Zhen Li, Le-Man Kuang 2018 Chin. Phys. Lett. 35 116401 |
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Abstract We investigate nonlinear Dicke quantum phase transition (QPT) induced by inter-atomic nonlinear interaction and its quantum witness in a cavity-Bose–Einstein-condensate (BEC) system. It is shown that inter-atomic nonlinear interaction in a cavity BEC system can induce first-order Dicke QPT. It is found that this nonlinear Dicke QPT can happen in an arbitrary coupling regime of the cavity and atoms. It is demonstrated that the quantum speed limit time can witness the Dicke QPT through its sudden change at the critical point of the QPT.
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Received: 19 July 2018
Published: 23 October 2018
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| PACS: |
64.70.Tg
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(Quantum phase transitions)
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37.30.+i
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(Atoms, molecules, andions incavities)
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42.50.Pq
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(Cavity quantum electrodynamics; micromasers)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11775075 and 1143401. |
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