Quantum fluctuations, temperature, and detuning effects in solid-light systems
Quantum fluctuations, temperature, and detuning effects in solid-light systems
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DOI：
10.1103/physrevlett.100.216401
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发表时间：
2008-05-30
影响因子：
8.6
通讯作者：
Littlewood, Peter B.
中科院分区：
文献类型：
--
作者：
Aichhorn, Markus;Hohenadler, Martin;Littlewood, Peter B.
本文采用变分集团方法分析了腔极化激元阵列中的超流到Mott绝缘体的转变，精确地考虑了有限长度尺度上的量子涨落。一维和二维相图具有重要的非平均场特征。Mott相中的单粒子激发光谱主要由Mott间隙分离的粒子和空穴带控制。与玻色-哈伯德模型相反，失谐允许改变玻色子的性质，从准定域激子到极化激元再到弱相互作用光子。密度为1的Mott态存在于温度T/g大于或接近0.03，这意味着实际腔耦合g的实验可达到的温度。
The superfluid to Mott insulator transition in cavity polariton arrays is analyzed using the variational cluster approach, taking into account quantum fluctuations exactly on finite length scales. Phase diagrams in one and two dimensions exhibit important non-mean-field features. Single-particle excitation spectra in the Mott phase are dominated by particle and hole bands separated by a Mott gap. In contrast to Bose-Hubbard models, detuning allows for changing the nature of the bosonic particles from quasilocalized excitons to polaritons to weakly interacting photons. The Mott state with density one exists up to temperatures T/g greater than or similar to 0.03, implying experimentally accessible temperatures for realistic cavity couplings g.