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arXiv 1801.09463cond-mat.stat-mech
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扩展横向伊辛模型中的动力学量子相变

Dynamical Quantum Phase Transitions in Extended Transverse Ising Models

Sourav Bhattacharjee, Amit Dutta

摘要:

研究了在突然猝灭后具有三个自旋相互作用的扩展伊辛模型的幺正动力学中的动力学量子相变(DQPT).重温平衡相图的模型,不同的量子相位的特点是由不同的绕组数,我们表明,在某些情况下,绕组数可能不会改变整个能谱中的间隙闭合点。虽然,通常存在一个一对一的对应关系之间的变化绕组数和与DQPT的关键时间尺度的数量,我们表明,相互作用的扩展性质可能会导致不寻常的情况。重要的是,我们表明,在集群的极限伊辛模型,三个关键模式与DQPTs成为退化,从而导致一个单一的临界时间尺度为一个给定的部门费舍尔零。

英文摘要:

We study the dynamical quantum phase transitions (DQPTs) manifested in the subsequent unitary dynamics of an extended Ising model with additional three spin interactions following a sudden quench. Revisiting the equilibrium phase diagram of the model where different quantum phases are characterised by different winding numbers, we show that in some situations the winding number may not change across a gap closing point in the energy spectrum. Although, usually there exists a one-to-one correspondence between the change in winding number and the number of critical time scales associated with DQPTs, we show that the extended nature of interactions may lead to unusual situations. Importantly, we show that in the limit of the cluster Ising model, three critical modes associated with DQPTs become degenerate and thereby leading to a single critical time scale for a given sector of Fisher zeros.

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