ICTS:29289

Video URL

Van Hove singularities in kagome metals

Van Hove singularities in kagome metals

(2024). Van Hove singularities in kagome metals. SciVideos. https://youtu.be/24y4ItzTQwY

Van Hove singularities in kagome metals. SciVideos, Aug. 13, 2024, https://youtu.be/24y4ItzTQwY 

          @misc{ scivideos_ICTS:29289,
            doi = {},
            url = {https://youtu.be/24y4ItzTQwY},
            author = {},
            keywords = {},
            language = {en},
            title = {Van Hove singularities in kagome metals},
            publisher = {},
            year = {2024},
            month = {aug},
            note = {ICTS:29289 see, \url{https://scivideos.org/icts-tifr/29289}}
          }
Julian Ingham
Talk numberICTS:29289
Source RepositoryICTS-TIFR
Source EventKagome off-scale
Collection

Abstract

van Hove singularities (vHS) -- momenta for which the group velocity of a Bloch state vanishes, and the density of states diverges -- have a dramatic impact on interaction effects when located near the Fermi level, resulting in a rich competition between superconductivity and charge order. While the presence of vHS near the Fermi level is typically unusual, it appears to be a ubiquitous feature of many recently discovered kagome metals. In this talk I will relate the novel properties of many of these materials to the nature of their vHS. Firstly I will discuss AV3Sb5, in which ARPES identifies twofold vHS near the Fermi level with opposite concavity. The opposite concavity of the vHS results in a weak-coupling instabilitly towards excitonic order, hybridising the two bands. Landau theory predicts the coexistence of charge density wave and excitonic order, offering a possible explanation of many of the unconventional responses seen in AV3Sb5. Second, I will discuss ScV6Sn6. Recent STM e...