Events

Event Information:

• Tue

  10

  Apr

  2018

  Colloquium: Topology and Quantum Phenomena in Nodal Matter

  4:00 pmLewis Hall 101

  Bruno Uchoa
  Department of Physics and Astronomy
  University of Oklahoma

  Topology and Quantum Phenomena in Nodal Matter

  Nodal matter describes a new metallic form where the Fermi surface collapses into sets of points or lines, and is not stabilized by Fermi pressure but by symmetries. The non-trivial quantum phenomena of those systems are described by topology, a field of mathematics that studies properties that remain invariant under continuous deformations of shapes and surfaces. In the first part of the talk I will give a general overview of the field. In the second one, I will describe a particular class of nodal materials where the Fermi surface has the shape of closed lines. I will show that interactions can drive this system into an exotic topological phase in three dimensions (3D) known as the 3D anomalous quantum Hall effect, where the system has spontaneous and topologically protected surface currents.