arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.03454cond-mat.str-elhep-thmath-phmath.MP
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Berry曲率的高维推广

Higher-dimensional generalizations of the Berry curvature

Anton Kapustin, Lev Spodyneiko

摘要:

一族具有非简并基态的有限维量子系统在参数空间上产生一个封闭的2-形式:Berry联络的曲率。它的上同调类是族的拓扑不变量。我们寻求推广的Berry曲率的家庭的间隙多体系统在D空间维度。场论预言,在空间维度D中,Berry曲率的类似物是参数空间上的一个封闭的(D+2)形式(Wess-Zumino-Witten形式)。我们构造这样的封闭形式的任意家庭的相互作用的晶格系统在所有维度。在一维自由费米子系统的特殊情况下,我们表明,这些形式可以表示在布里渊区和参数空间的乘积的布洛赫-贝瑞连接。在家庭的短程纠缠系统的情况下,我们认为,我们的形式在球面周期的积分是量子化的。

英文摘要:

A family of finite-dimensional quantum systems with a non-degenerate ground state gives rise to a closed 2-form on the parameter space: the curvature of the Berry connection. Its cohomology class is a topological invariant of the family. We seek generalizations of the Berry curvature to families of gapped many-body systems in D spatial dimensions. Field theory predicts that in spatial dimension D the analog of the Berry curvature is a closed (D+2)-form on the parameter space (the Wess-Zumino-Witten form). We construct such closed forms for arbitrary families of interacting lattice systems in all dimensions. In the special case of systems of free fermions in one dimension, we show that these forms can be expressed in terms of the Bloch-Berry connection on the product of the Brillouin zone and the parameter space. In the case of families of Short-Range Entangled systems, we argue that integrals of our forms over spherical cycles are quantized.

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