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arXiv 2007.13790cond-mat.stat-mech
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不同角度的Kibble-Zurek机制:横向XY模型和次引导标度

Kibble-Zurek mechanism from different angles: The transverse XY model and subleading scalings

Björn Ladewig, Steven Mathey, Sebastian Diehl

摘要:

Kibble-Zurek机制描述了动态接近相变时临界标度的饱和。这是绝热性被打破的结果,绝热性是由缓慢驱动所设定的尺度造成的。通过驱动间隙参数,这可以用于确定领先的临界指数。但这只是冰山一角:驱动更一般的耦合允许一个人激活临界指数的整个普适谱。在这里,我们建立了这种现象和它的可观察现象的量子相变在一个解析可解的极小模型和实验相关的横向XY模型。的激励密度主机的序列的指数,包括subleading的渐近标度行为的驱动协议的相图中的几何形状的适当设计。相对于相边界的平行驱动的情况下,仍然可以导致绝热性的破缺,并以最清楚的方式暴露子领先指数。作为对公开普遍信息的补充,我们提取了由于模型的非普遍内容而导致的对次领导缩放制度的限制。

英文摘要:

The Kibble-Zurek mechanism describes the saturation of critical scaling upon dynamically approaching a phase transition. This is a consequence of the breaking of adiabaticity due to the scale set by the slow drive. By driving the gap parameter, this can be used to determine the leading critical exponents. But this is just the `tip of the iceberg': Driving more general couplings allows one to activate the entire universal spectrum of critical exponents. Here we establish this phenomenon and its observable phenomenology for the quantum phase transitions in an analytically solvable minimal model and the experimentally relevant transverse XY model. The excitation density is shown to host the sequence of exponents including the subleading ones in the asymptotic scaling behavior by a proper design of the geometry of the driving protocol in the phase diagram. The case of a parallel drive relative to the phase boundary can still lead to the breaking of adiabaticity, and exposes the subleading exponents in the clearest way. Complementarily to disclosing universal information, we extract the restrictions due to the non-universal content of the models onto the extent of the subleading scalings regimes.

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