Broken symmetry and competing orders in Weyl semimetal interfaces
Broken symmetry and competing orders in Weyl semimetal interfaces
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DOI：
10.1103/physrevb.107.l041402
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发表时间：
2022-05
影响因子：
3.7
通讯作者：
Ritajit Kundu;H. Fertig;A. Kundu
中科院分区：
文献类型：
--
作者：
Ritajit Kundu;H. Fertig;A. Kundu
研究了两个Weyl半金属表面相互作用诱导的对称破缺态。在表面间和表面内库仑相互作用的存在下，可能出现共存和/或彼此竞争的多个破缺对称性。层间激子凝聚体涉及不同的FA口味的形式，与振幅确定的相互作用的强度和嵌套的程度之间的弧。对于在动量上分离得很好且嵌套很强的FA对，所得到的状态是Fulde-Ferrell-Larkin-Ovchinnikov（FFLO）超导体的粒子-空穴模拟。此外，层内相互作用还会诱导电荷密度波（CDW）有序化，因此系统的最一般状态是超固体。这些排序原则上携带非线性行为的签名和库仑阻力输运测量中的窄带噪声。
We consider interaction-induced broken symmetry states of two Weyl semimetal surfaces with multiple Fermi-arc (FA) states. In the presence of inter- and intra-surface Coulomb interactions, multiple broken symmetries may emerge which coexist and/or compete with one another. Interlayer exciton condensates involving different FA flavors are shown to form, with amplitudes determined by the strength of interactions and the degree of nesting among the arcs. For FA pairs which are well-separated in momentum with strong nesting, the resulting state is a particle-hole analog of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconductor. Intralayer interactions moreover induce charge density wave (CDW) ordering, so that the most general state of the system is a supersolid. These orderings in principle carry signatures in non-linear behavior and narrow band noise in Coulomb drag transport measurements.