Unconventional Spectral Gaps Induced by Charge Density Waves in the Weyl Semimetal (TaSe₄)₂I.

ABSTRACT: Coupling Weyl quasiparticles and charge density waves (CDWs) can lead to fascinating band renormalization and many-body effects beyond band folding and Peierls gaps. For the quasi-one-dimensional chiral compound (TaSe₄)₂I with an incommensurate CDW transition at T_C = 263 K, photoemission mappings thus far are intriguing due to suppressed emission near the Fermi level. Models for this unconventional behavior include axion insulator phases, correlation pseudogaps, polaron subbands, bipolaron bound states, etc. Our photoemission measurements show sharp quasiparticle bands crossing the Fermi level at T > T_C, but for T < T_C, these bands retain their dispersions with no Peierls or axion gaps at the Weyl poi

SUBMITTER: Lin MK 

PROVIDER: S-EPMC11261618 | biostudies-literature | 2024 Jul

REPOSITORIES: biostudies-literature