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arXiv 0904.2852cond-mat.stat-mechhep-thnlin.SIquant-ph
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精确可解的拟埃尔米特横截面伊辛模型

Exactly Solvable Quasi-hermitian Transverse Ising Model

Tetsuo Deguchi, Pijush K. Ghosh

摘要:

本文证明了一维横向伊辛模型的非厄米形变具有准厄米性。通过相似变换,从起始非厄米哈密顿量得到横向伊辛链。因此,两个模型具有相同的本征谱,尽管本征函数不同。在希尔伯特空间中的度量,它使非厄米模型酉,并确保状态的完整性,已被明确地构造。虽然纵向关联函数对于非厄米和厄米伊辛模型都是相同的,但是横向关联函数的差别却显现出来,它们已经被明确地计算出来并且并不总是真实的。在非厄米哈密顿量的希尔伯特空间中,我们确定了一组厄米自旋算符,由此非厄米哈密顿量的所有关联函数都变为实的,并且与标准横伊辛模型的关联函数相同.对非厄米模型中的量子相变作了评述。

英文摘要:

A non-hermitian deformation of the one-dimensional transverse Ising model is shown to have the property of quasi-hermiticity. The transverse Ising chain is obtained from the starting non-hermitian Hamiltonian through a similarity transformation. Consequently, both the models have identical eigen-spectra, although the eigen-functions are different. The metric in the Hilbert space, which makes the non-hermitian model unitary and ensures the completeness of states, has been constructed explicitly. Although the longitudinal correlation functions are identical for both the non-hermitian and the hermitian Ising models, the difference shows up in the transverse correlation functions, which have been calculated explicitly and are not always real. A proper set of hermitian spin operators in the Hilbert space of the non-hermitian Hamiltonian has been identified, in terms of which all the correlation functions of the non-hermitian Hamiltonian become real and identical to that of the standard transverse Ising model. Comments on the quantum phase transitions in the non-hermitian model have been made.

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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