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arXiv 2602.02428cond-mat.str-elcond-mat.mes-hall
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半满陈数带在拓扑临界点附近电磁响应

Electromagnetic Response of a Half-Filled Chern Band near Topological Criticality

Weizmann Institute of Science(魏茨曼科学研究所);Technical University of Munich(慕尼黑工业大学)

Xinlei Yue, Fabian Pichler, Michael Knap, Ady Stern

AI总结:

研究半满陈数带在拓扑临界点附近的电磁响应,揭示等离子体衰减现象源于规范场和狄拉克费米子谱,且在连续相变中具有有限范围的衰减行为。

摘要:

我们在半满陈数带中评估了电磁响应可观测量,跨越复合费米液体(CFL)与费米液体(FL)相之间的拓扑相变。虽然在CFL相中存在一个尖锐的有隙等离子体模,但我们证明在CFL与FL相之间提出的连续相变附近,该等离子体模会被衰减。这种等离子体衰减现象源于涌现的规范场和狄拉克费米子样谱。类似特征也出现在其他连续非约束拓扑相变中,例如玻色系统中劳伦茨到超流相变。特别是,这种衰减行为在相边界跨过有限范围,并因此我们预计即使相变是弱一阶相变时,它也会持续存在。此外,我们分析了这些拓扑相变中德鲁德重量、波矢依赖的电导率以及手性镜像效应的行为。

英文摘要:

We evaluate electromagnetic-response observables in a half-filled Chern band, across a topological phase transition between a composite Fermi liquid (CFL) and a Fermi liquid (FL) phase. While a sharp gapped plasma mode exists deep in the CFL phase, we demonstrate that it is damped near the proposed continuous phase transition between CFL and FL. This plasmon-damping phenomenon originates from emergent gauge fields and a Dirac-fermion-like spectrum. Similar features also occur in other continuous deconfined topological phase transitions, such as the Laughlin to superfluid transition in a bosonic system. In particular, this damping behavior extends over a finite range across the phase boundary, and, hence, we expect it to persist even when the transition is weakly first-order. Furthermore, we analyze the characteristic conductivity behavior, such as the Drude weight, the wavevector-dependent conductivity, the chiral mirror effect, and thermodynamic behavior, including compressibility and magnetic susceptibility across these topological phase transitions.

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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