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arXiv quant-ph/0401029quant-phcond-mat.mes-hall
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广义自旋玻色子(Dicke)模型中的相变

Phase Transitions in Generalised Spin-Boson (Dicke) Models

Clive Emary, Tobias Brandes

摘要:

本文研究了赝自旋$x$ - $z$平面上具有任意玻色子耦合的广义单模Dicke哈密顿量.我们发现在热力学,大自旋限制的耦合角的函数,这使我们能够不断移动之间的简单的退相和原来的迪克哈密顿精确的解决方案。只有在后一种情况下(正交静态和波动耦合),宇称对称诱导的量子相变发生。

英文摘要:

We consider a class of generalised single mode Dicke Hamiltonians with arbitrary boson coupling in the pseudo-spin $x$-$z$ plane. We find exact solutions in the thermodynamic, large-spin limit as a function of the coupling angle, which allows us to continuously move between the simple dephasing and the original Dicke Hamiltonians. Only in the latter case (orthogonal static and fluctuating couplings), does the parity-symmetry induced quantum phase transition occur.

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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