arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2007.09311cond-mat.mes-hallcond-mat.quant-gasmath-phmath.MPquant-ph
收藏

纽结与非厄米布洛赫带

Knots and Non-Hermitian Bloch Bands

Haiping Hu, Erhai Zhao

摘要:

在量子物理学中,纽结有一段曲折的历史。它们作为失败的原子模型而被抛弃。直到很久以后,拓扑量子场论中的纽结不变量和威尔逊圈之间的联系才被发现。在这里,我们证明了本征能弦所系的结提供了具有可分离带的一维非埃尔米特(NH)汉密尔顿的完整拓扑分类。证明了一个$\mathbb{Z}_2$结不变量,即作为威尔逊圈本征相位之和的全局双正交Berry相位$Q$等于NH带的排列奇偶性.我们表明,两个阶段之间的过渡,其特征在于不同的结发生通过例外点,并在两种类型。我们进一步发展了一个算法来构造相应的紧束缚NH哈密顿量的任何所需的结,并提出了一个计划,通过量子淬火探测结的结构。该理论和算法的特点,例如霍普夫链接,三叶结,图-8结和Whitehead链接模型哈密顿证明。

英文摘要:

Knots have a twisted history in quantum physics. They were abandoned as failed models of atoms. Only much later was the connection between knot invariants and Wilson loops in topological quantum field theory discovered. Here we show that knots tied by the eigenenergy strings provide a complete topological classification of one-dimensional non-Hermitian (NH) Hamiltonians with separable bands. A $\mathbb{Z}_2$ knot invariant, the global biorthogonal Berry phase $Q$ as the sum of the Wilson loop eigenphases, is proved to be equal to the permutation parity of the NH bands. We show the transition between two phases characterized by distinct knots occur through exceptional points and come in two types. We further develop an algorithm to construct the corresponding tight-binding NH Hamiltonian for any desired knot, and propose a scheme to probe the knot structure via quantum quench. The theory and algorithm are demonstrated by model Hamiltonians that feature for example the Hopf link, the trefoil knot, the figure-8 knot and the Whitehead link.

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。

↑