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arXiv 2403.19601cond-mat.str-elcond-mat.mes-hall
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具有偶极对称性破缺的拓扑相与相变

Topological Phases and Phase Transitions with Dipolar Symmetry Breaking

Amogh Anakru, Zhen Bi

AI总结:

本文研究整数填充下一维和二维偶极守恒费米子模型,发现偶极对称性破缺相中的平均场能带绝缘体拓扑指标强烈影响偶极 Goldstone 模式低能物理,并揭示了一个具有非平凡动力学指数的新颖量子临界点。

摘要:

具有偶极矩守恒的系统近年来引起了广泛关注,因为它们既实现了新颖的量子动力学,也实现了奇异的基态相。在这项工作中,我们研究了整数填充下一维和二维偶极守恒费米子模型的一些一般性质。我们发现,偶极对称性破缺相可以导致一个平均场能带绝缘体,其拓扑指标能够强烈影响偶极 Goldstone 模式的低能物理。我们研究了在存在 Goldstone 模式的情况下平均场基态的二维拓扑相变。临界理论类似于与无质量 Dirac 费米子耦合的 2+1 维量子电动力学,但存在一些关键差异,并展示了一个具有非平凡动力学指数的新颖量子临界点。我们还讨论了一维偶极守恒模型的类似情形以及拓扑不变量的作用。

英文摘要:

Systems with dipole moment conservation have been of recent interest, as they realize both novel quantum dynamics and exotic ground state phases. In this work, we study some generic properties of 1-D and 2-D dipole-conserving fermionic models at integer fillings. We find that a dipolar symmetry-breaking phase can result in a mean-field band insulator whose topological indices can strongly affect the low-energy physics of the dipolar Goldstone modes. We study the 2-D topological phase transition of the mean-field ground states in the presence of the Goldstone modes. The critical theory resembles the 2+1d quantum electrodynamics coupled to massless Dirac fermions with some crucial differences and shows a novel quantum critical point featuring a nontrivial dynamical exponent. We also discuss the analogous case of 1-D dipole-conserving models and the role of topological invariants.

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。

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