Light-shift-induced quantum phase transitions of a Bose-Einstein condensate in an optical cavity
Light-shift-induced quantum phase transitions of a Bose-Einstein condensate in an optical cavity
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光腔中玻色-爱因斯坦凝聚体的光移引起的量子相变
DOI：
10.1103/physreva.83.033601
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发表时间：
2011-03-03
影响因子：
2.9
通讯作者：
Jia, Suotang
中科院分区：
文献类型：
--
作者：
Liu, Ni;Lian, Jinling;Jia, Suotang
在本文中，我们揭示了由强非线性原子-光子相互作用引起的丰富基态性质，这种相互作用是在最近的高精细腔的玻色-爱因斯坦凝聚耦合实验中发现的[Nature (London) 464, 1301(2010)]。通过对实验可测原子居数的研究，揭示了两个失谐相关相图。特别是，在蓝色失谐中预测了从超辐射相位或正常相位到动态不稳定相位的两个量子相变。此外，还找到了三相共存点。还证明了这些预测的量子相变是仅受基态能量二阶导数支配的本征相变。最后，我们还指出，先前预测的超辐射相和正常相共存的区域在基态中不可能发生。
In this paper we reveal the rich ground-state properties induced by the strong nonlinear atom-photon interaction which has been found in the recent experiment about a Bose-Einstein condensate coupling with a high-finesse cavity [Nature (London) 464, 1301 (2010)]. Two detuning-dependent phase diagrams are revealed by investigating the experimentally measurable atomic population. In particular, two quantum phase transitions from the superradiant phase or the normal phase to a dynamically unstable phase are predicted in the blue detuning. Moreover, the three-phase coexistence points are found. It is also demonstrated that these predicted quantum phase transitions are the intrinsic transitions governed only by the second-order derivative of the ground-state energy. Finally, we also point out that the region involving coexistence of the superradiant phase and the normal phase previously predicted cannot happen in the ground state.