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SUMMARY:Real Space Approaches to Topological Band Systems - Ryan L Barnett
  (Imperial College London)
DTSTART:20250130T140000Z
DTEND:20250130T153000Z
UID:TALK221416@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:The fields of Topology and Condensed Matter Physics have exper
 ienced a fruitful overlap which has led to a deep understanding of certain
  physical properties. For instance\, topological invariants expressed in t
 erms of "bulk" quantities (i.e. deep in the material)\, predict the existe
 nce of robust states living on the surface. In this talk\, I will focus on
  a real-space picture of such topological systems. In particular\, I will 
 discuss how to construct optimally localised Wannier functions (a key conc
 ept bridging solid-state physics and chemistry) for so-called Chern insula
 tors. I will also discuss how standard expressions for polarisation are no
 t generally gauge invariant for topological band systems and show how this
  can be rectified\, drawing on ideas from the Wannier construction. \n
LOCATION:TCM Seminar Room
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