arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2006.12898cond-mat.mes-hallphysics.opticsquant-ph
收藏

非厄米系统的相变与广义双正交极化

Phase Transitions and Generalized Biorthogonal Polarization in Non-Hermitian Systems

Elisabet Edvardsson, Flore K. Kunst, Tsuneya Yoshida, Emil J. Bergholtz

摘要:

非厄米(NH)哈密顿量可以用来描述耗散系统,目前在拓扑学的背景下被深入研究。厄米和NH模型之间的一个显着差异是传统的散装边界对应失效的使用从布洛赫带计算的拓扑不变量来表征边界模式在通用NH系统的故障。克服这一困难的一种方法是使用双正交量子力学的框架来定义双正交偏振,其用作实空间不变量,指示边界状态的存在。在这里,我们推广的概念的双正交极化超出了以前的结果与任何数量的边界模式的系统,并表明,它是不变的基础变换以及当地的酉变换。此外,我们提出了一个推广的perviously开发的方法,用它来找到所有的系统与开放边界的NH模型的体状态。结合变分状态的精确解,我们阐明真正NH方面的体积和边界之间的相互作用在相变。

英文摘要:

Non-Hermitian (NH) Hamiltonians can be used to describe dissipative systems, and are currently intensively studied in the context of topology. A salient difference between Hermitian and NH models is the breakdown of the conventional bulk-boundary correspondence invalidating the use of topological invariants computed from the Bloch bands to characterize boundary modes in generic NH systems. One way to overcome this difficulty is to use the framework of biorthogonal quantum mechanics to define a biorthogonal polarization, which functions as a real-space invariant signaling the presence of boundary states. Here, we generalize the concept of the biorthogonal polarization beyond the previous results to systems with any number of boundary modes, and show that it is invariant under basis transformations as well as local unitary transformations. Additionally, we propose a generalization of a perviously-developed method with which to find all the bulk states of system with open boundaries to NH models. Using the exact solutions in combination with variational states, we elucidate genuinely NH aspects of the interplay between bulk and boundary at the phase transitions.

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。

↑