Origin of switchable quasiparticle-interference chirality in loop-current phase of kagome metals measured by scanning-tunneling-microscopy.

ABSTRACT: In the kagome superconductors AV₃Sb₅ (A=Cs,Rb,K), a cascade of correlated electron phases cause exotic symmetry-breaking quantum states. In particular, the dissipationless chiral loop-current phase has been attracting increasing attention. A crucial clue is offered by the chirality of the quasiparticle interference signal observed in scanning tunneling microscopy. However, the connection between loop-current chirality and quasiparticle interference chirality remains poorly understood. Here, we reveal theoretically that a pronounced chiral quasiparticle interference signal emerges in the extremely dilute impurity regime ( ≲ 0.1%). A single impurity at site Z induces a quasiparticle interference chirality χ_Z = ± 1, determined by the direction of the Z_3</

SUBMITTER: Nakazawa S 

PROVIDER: S-EPMC12572650 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature