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    题名: Path integral Monte Carlo study of the interacting quantum double-well model: Quantum phase transition and phase diagram
    作者: 林瑜琤
    Lin, Yu-Cheng
    贡献者: 應物所
    日期: 2007.01
    上传时间: 2014-05-01 17:50:55 (UTC+8)
    摘要: The discrete time path integral Monte Carlo (PIMC) with a one-particle density matrix approximationis applied to study the quantum phase transition in the coupled double-well chain. Toimprove the convergence properties, the exact action for a single particle in a double well potentialis used to construct the many-particle action. The algorithm is applied to the interacting quantumdouble-well chain for which the zero-temperature phase diagram is determined. The quantum phasetransition is studied via finite-size scaling and the critical exponents are shown to be compatiblewith the classical two-dimensional (2D) Ising universality class – not only in the order-disorderlimit (deep potential wells) but also in the displacive regime (shallow potential wells).
    關聯: Physical Review E, 75(1), 016702(1-6)
    数据类型: article
    显示于类别:[應用物理研究所 ] 期刊論文

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