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 2202.02548cond-mat.str-elcond-mat.mes-hallquant-ph
收藏

非厄米特系统的多体拓扑

Many-body topology of non-Hermitian systems

Kohei Kawabata, Ken Shiozaki, Shinsei Ryu

摘要:

非厄米性产生了独特的拓扑相位,在厄米系统中没有对应物。这种内在的非厄米拓扑相甚至出现在一维中,而在一维厄米系统中不出现拓扑相。尽管最近相当大的兴趣,内禀非厄米拓扑相位主要是在带理论描述的非相互作用系统中进行研究。目前还不清楚它们是否在多体相互作用的存在下存活或减少。在这里,我们表明,在一维的内在非厄米拓扑相生存,即使在多体相互作用的存在。通过复值多体谱绕成U(1)规范场(磁通量),我们建立了一个多体拓扑不变量。作为一个说明性的例子,我们研究相互作用的Hatano-Nelson模型,并发现一个独特的拓扑相和趋肤效应引起的多体相互作用。

英文摘要:

Non-Hermiticity gives rise to unique topological phases that have no counterparts in Hermitian systems. Such intrinsic non-Hermitian topological phases appear even in one dimension while no topological phases appear in one-dimensional Hermitian systems. Despite the recent considerable interest, the intrinsic non-Hermitian topological phases have been mainly investigated in noninteracting systems described by band theory. It has been unclear whether they survive or reduce in the presence of many-body interactions. Here, we demonstrate that the intrinsic non-Hermitian topological phases in one dimension survive even in the presence of many-body interactions. We formulate a many-body topological invariant by the winding of the complex-valued many-body spectrum in terms of a U (1) gauge field (magnetic flux). As an illustrative example, we investigate the interacting Hatano-Nelson model and find a unique topological phase and skin effect induced by many-body interactions.

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。

↑