Quantum transfer-matrix method and thermo-quantum dynamics

Quantum transfer-matrix method and thermo-quantum dynamics
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量子传递矩阵方法和热量子动力学

DOI:
10.1016/s0378-4371(02)01781-8
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发表时间:
2003
影响因子:
3.3
通讯作者:
Masuo Suzuki
Masuo Suzuki
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Masuo Suzuki

文献摘要

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介绍了量子转移矩阵(QTM)方法,并在此基础上建立了热量子动力学方程。相关量子系统(例如一维海森堡模型)的自由能仅用QTM的最大本征值λ max表示。甚至相关长度也可以用λ max与下一个最大特征值λ 2的比值来表示为<$(T)− 1 = log(λ max/λ 2)。这种新的公式具有很大的优点,即在热力学极限下,任何局部可观测Q的热平均Δ Q Δ在单(共轭)希尔伯特空间中被表示为对温度相关状态向量的期望值,而不是在热场动力学中使用双希尔伯特空间。
The quantum transfer-matrix (QTM) method is reviewed and thermo-quantum dynamics is formulated on the basis of the QTM. The free energy of the relevant quantum system (e.g. the one-dimensional Heisenberg model) is expressed only in terms of the maximum eigenvalue λmaxof the QTM. Even the correlation length ξ(T) is expressed in terms of the ratio of λmaxover the next largest eigenvalue λ2as ξ(T)−1=log(λmax/λ2). This new formulation has the great merit that the thermal average 〈Q〉 for any local observable Q in the thermodynamic limit is expressed as an expectation value over a temperature-dependent state vector in the single (conjugate) Hilbert space in contrast to the usage of the double Hilbert space in the thermo-field dynamics.