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arXiv 2102.08389cond-mat.str-el
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离散对称Majorana模型的Lieb-Schultz-Mattis型定理

Lieb-Schultz-Mattis type theorems for Majorana models with discrete symmetries

Ömer M. Aksoy, Apoorv Tiwari, Christopher Mudry

摘要:

我们证明了两个Lieb-Schultz-Mattis型定理,适用于任何非线性不变和局部费米子$d$维格点哈密顿量,其中费米子数守恒被分解为费米子宇称守恒。我们发现,当内部对称群$G^{\,}_{f}$实现本地(在重复单位晶格)由一个非平凡的投影表示,那么基态不能同时非退化,对称(相对于晶格平移和$G^{\,}_{f}$),和缺口。我们还表明,当重复单位细胞主机奇数的马约拉纳自由度和基数的晶格是偶数,那么基态不能同时非简并,带隙,平移对称。

英文摘要:

We prove two Lieb-Schultz-Mattis type theorems that apply to any translationally invariant and local fermionic $d$-dimensional lattice Hamiltonian for which fermion-number conservation is broken down to the conservation of fermion parity. We show that when the internal symmetry group $G^{\,}_{f}$ is realized locally (in a repeat unit cell of the lattice) by a nontrivial projective representation, then the ground state cannot be simultaneously nondegenerate, symmetric (with respect to lattice translations and $G^{\,}_{f}$), and gapped. We also show that when the repeat unit cell hosts an odd number of Majorana degrees of freedom and the cardinality of the lattice is even, then the ground state cannot be simultaneously nondegenerate, gapped, and translation symmetric.

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