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arXiv 1401.7250cond-mat.stat-mechcond-mat.quant-gascond-mat.str-el
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伊辛链中激发态的量子猝灭

Quantum quenches from excited states in the Ising chain

Leda Bucciantini, Márton Kormos, Pasquale Calabrese

摘要:

本文研究了横场伊辛链中磁场突然猝灭后的非平衡动力学,从猝灭前哈密顿量的激发态出发。我们证明了局部关联函数的平稳值可以用广义吉布斯系综(GGE)来描述。然后,我们研究了全时间的横向磁化强度的演变,通过固定相位的方法。对铁磁相内猝灭的一类特殊激发态,解析地导出了等时两点纵向关联函数,并进行了一般的数值研究。对于同一类状态和任意猝灭,也解析地得到了自旋块的纠缠熵的全时依赖性。

英文摘要:

We consider the non-equilibrium dynamics after a sudden quench of the magnetic field in the transverse field Ising chain starting from excited states of the pre-quench Hamiltonian. We prove that stationary values of local correlation functions can be described by the generalised Gibbs ensemble (GGE). Then we study the full time evolution of the transverse magnetisation by means of stationary phase methods. The equal time two-point longitudinal correlation function is analytically derived for a particular class of excited states for quenches within the ferromagnetic phase, and studied numerically in general. The full time dependence of the entanglement entropy of a block of spins is also obtained analytically for the same class of states and for arbitrary quenches.

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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