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arXiv 1311.2145cond-mat.quant-gas
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二元玻色混合物超流-绝缘体相变的量子三临界性

Quantum tricriticality at the superfluid-insulator transition of binary Bose mixtures

Yasuyuki Kato, Daisuke Yamamoto, Ippei Danshita

摘要:

研究了正方格子上二分量玻色-哈伯德模型在三临界点附近的量子临界性。通过量子蒙特卡罗模拟证实了超流-绝缘体相变边界上量子TCP的存在。此外,我们在有效场论的基础上解析地导出了量子三临界行为。我们发现了量子三临界性的两个显著特征,即超流转变温度与化学势的依赖性和强的密度涨落。我们认为,这些功能是直接观察到现有的实验装置中的玻色-玻色混合物的光晶格。

英文摘要:

Quantum criticality near a tricritical point (TCP) is studied in the two-component Bose-Hubbard model on square lattices. The existence of quantum TCP on a boundary of superfluid-insulator transition is confirmed by quantum Monte Carlo simulations. Moreover, we analytically derive the quantum tricritical behaviors on the basis of an effective field theory. We find two significant features of the quantum tricriticality, that are the chemical potential dependence of the superfluid transition temperature and a strong density fluctuation. We suggest that these features are directly observable in existing experimental setups of Bose-Bose mixtures in optical lattices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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