AI 中文总结
研究外尔激子绝缘体中的输运，基于低能哈密顿量发展半经典波包理论，发现声致霍尔电流，其源于质量诱导贝里结构，为外尔激子序提供直接探针及相互作用产生质量的输运特征。
AI 中文摘要
外尔半金属表现出由其无隙手性节点控制的反常输运，而有隙外尔系统通常被认为会失去这种独特响应。本文表明，外尔激子绝缘体存在一种仅在有质量相中存在的新形式的轴向场驱动输运。从与应变诱导轴向势耦合的有隙外尔系统的低能Breit型哈密顿量出发，发展了半经典波包理论，确定了由动态轴向势产生的耗散横向电流。这种响应在定性上不同于有隙系统中的普通矢量势输运和无隙外尔半金属中的轴向响应。物理上，它源于重构外尔能带的质量诱导贝里结构，当系统因手性化学势不平衡而偏离平衡时变得活跃。研究表明横向声波提供了产生所需动态轴向场的自然途径，并针对实际材料参数估计了产生的电流。结果揭示了声致霍尔输运是外尔激子序的直接探针，并提供了外尔材料中相互作用产生质量的输运特征。
英文摘要
Weyl semimetals exhibit anomalous transport controlled by their gapless chiral nodes, while gapped Weyl systems are often expected to lose such distinctive responses. Here we show that Weyl excitonic insulators instead host a new form of axial-field-driven transport that exists only in the massive phase. Starting from the low-energy Breit-type Hamiltonian for a gapped Weyl system coupled to strain-induced axial potentials, we develop a semiclassical wave-packet theory and identify a dissipative transverse current generated by a dynamical axial potential. This response is qualitatively distinct from both ordinary vector-potential transport in gapped systems and axial responses in gapless Weyl semimetals. Physically, it originates from a mass-induced Berry structure of the reconstructed Weyl bands, which becomes active when the system is driven out of equilibrium by a chiral chemical-potential imbalance. We show that transverse sound waves provide a natural route to generate the required dynamical axial field and estimate the resulting current for realistic material parameters. Our results reveal sound-induced Hall transport as a direct probe of Weyl excitonic order and provide a transport signature of interaction-generated mass in Weyl materials.
Comments11 pages, 2 figures
