Seminars

  • Dirac line node topological semimetals

  • Speaker : 김영국/Youngkuk Kim
    Affiliation : Department of Physics, Sungkyunkwan University
    Date : March 23, 2018 2:00 PM
    Place : Building 110 Room N102
    Contact : noejung@unist.ac.kr
    Host : Prof. Noejung Park
  • Abstract

  • Recently, topology has become a crucial ingredient to understand many properties of materials. One of such properties is a robust metallic behavior of semimetals, featuring topologically protected nodal structure between the conduction and valence bands. Graphene with Dirac points in momentum space is a well-known example, and its three-dimensional version, called 3D Dirac semimetals, is also widely studied. Here we introduce yet another example of topological semimetals, called Dirac line node (DLN) semimetals. DLN semimetals are characterized by one-dimensional nodal lines between the conduction and valance bands in momentum space. The Berry flux π protects the DLN when time-reversal and inversion symmetries are preserved without SOC. We review current issues of the DLN semimetals, and discuss the possible temperature effects.