Quantum transfer-matrix method and thermo-quantum dynamics
Quantum transfer-matrix method and thermo-quantum dynamics
复制标题
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
中科院分区:
文献类型:
--
作者:
Masuo Suzuki
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.