Blog
About

  • Record: found
  • Abstract: found
  • Article: found
Is Open Access

Novel Quantum Criticality in Two Dimensional Topological Phase transitions

Preprint

Read this article at

Bookmark
      There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

      Abstract

      Topological quantum phase transitions intrinsically intertwine self-similarity and topology of many-electron wave-functions, and divining them is one of the most significant ways to advance understanding in condensed matter physics. Our focus is to investigate an unconventional class of the transitions between insulators and Dirac semimetals whose description is beyond conventional pseudo relativistic Dirac Hamiltonian. At the transition without the long-range Coulomb interaction, the electronic energy dispersion along one direction behaves like a relativistic particle, linear in momentum, but along the other direction it behaves like a non-relativistic particle, quadratic in momentum. Various physical systems ranging from TiO\({}_2\)-VO\({}_2\) heterostructure to organic material \(\alpha\)-(BEDT-TTF)\({}_2\) I\({}_3\) under pressure have been proposed to have such anisotropic dispersion relation. Here, we discover a novel quantum criticality at the phase transition by incorporating the 1/r long-range Coulomb interaction. Unique interplay between the Coulomb interaction and electronic critical modes enforces not only the anisotropic renormalization of the Coulomb interaction but also marginally modified electronic excitation. In connection with experiments, we investigate several striking effects in physical observables of our novel criticality.

      Related collections

      Author and article information

      Journal
      2015-08-15
      2016-01-25
      1508.03777

      http://arxiv.org/licenses/nonexclusive-distrib/1.0/

      Custom metadata
      Scientific Reports, 6, 19198 (2016)
      12 pages + 31 pages, 5 figures, 2 tables, published version
      cond-mat.str-el cond-mat.mes-hall

      Condensed matter, Nanophysics

      Comments

      Comment on this article

      Similar articles 14,226