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Excitations of optomechanically driven Bose–Einstein condensates in a cavity： Photodetection measurements |
| Neha Aggarwala b, Sonam Mahajana, Aranya B. Bhattacherjeeb c, Man Mohana |
a Department of Physics and Astrophysics, University of Delhi, Delhi-110007, India;
b Department of Physics, ARSD College, University of Delhi (South Campus), New Delhi-110021, India;
c School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India |
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Abstract We present a detailed study to analyze the Dicke quantum phase transition within the thermodynamic limit for an optomechanically driven Bose-Einstein condensate in a cavity. The photodetection-based quantum optical measurements have been performed to study the dynamics and excitations of this optomechanical Dicke system. For this, we discuss the eigenvalue analysis, fluorescence spectrum and the homodyne spectrum of the system. It has been shown that the normal phase is negligibly affected by the mechanical mode of the mirror while it has a significant effect in the superradiant phase. We have observed that the eigenvalues and the spectra both exhibit distinct features that can be identified with the photonic, atomic and phononic branches. In the fluorescence spectra, we further observe an asymmetric coherent energy exchange between the three degrees of freedom of the system in the superradiant phase arising as a result of optomechanical interaction and Bloch-Siegert shift.
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Received: 07 February 2014
Revised: 07 April 2014
Accepted manuscript online:
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PACS:
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03.75.Kk
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(Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)
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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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Corresponding Authors:
Sonam Mahajan
E-mail: sonammahajan1987@gmail.com
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| About author: 03.75.Kk; 64.70.Tg; 37.30.+i |
Cite this article:
Neha Aggarwal, Sonam Mahajan, Aranya B. Bhattacherjee, Man Mohan Excitations of optomechanically driven Bose–Einstein condensates in a cavity： Photodetection measurements 2014 Chin. Phys. B 23 100305
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