On the Local Equivalence Between the Canonical and the Microcanonical Ensembles for Quantum Spin Systems
On the Local Equivalence Between the Canonical and the Microcanonical Ensembles for Quantum Spin Systems
复制标题
关于量子自旋系统的正则系综与微正则系综之间的局部等价性
DOI:
10.1007/s10955-018-2077-y
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发表时间:
2018
影响因子:
1.6
通讯作者:
Hal Tasaki
中科院分区:
文献类型:
--
作者:
宮嶋茂之;藪野正裕;山下太郎;三木茂人;寺井弘高;中辻知;Hal Tasaki
We study a quantum spin system on thed-dimensional hypercubic latticewithsites with periodic boundary conditions. We take an arbitrary translation invariant short-ranged Hamiltonian. For this system, we consider both the canonical ensemble with inverse temperatureand the microcanonical ensemble with the corresponding energy. For an arbitrary self-adjoint operatorwhose support is contained in a hypercubic blockBinside, we prove that the expectation values ofwith respect to these two ensembles are close to each other for largeNprovided thatis sufficiently small and the number of sites inBis. This establishes the equivalence of ensembles on the level of local states in a large but finite system. The result is essentially that of Brandao and Cramer (here restricted to the case of the canonical and the microcanonical ensembles), but we prove improved estimates in an elementary manner. We also review and prove standard results on the thermodynamic limits of thermodynamic functions and the equivalence of ensembles in terms of thermodynamic functions. The present paper assumes only elementary knowledge on quantum statistical mechanics and quantum spin systems.
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