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SUMMARY:Quantum geometry effects in flat bands  - Bruno Uchoa\, University
  of Oklahoma
DTSTART:20250415T130000Z
DTEND:20250415T143000Z
UID:TALK228388@talks.cam.ac.uk
CONTACT:Gaurav
DESCRIPTION:By endowing the Hilbert space with a metric and a curvature\, 
 the modern theory of solids resorts to tools from differential geometry an
 d topology to analyze the physical properties of electrons in a crystal. A
 fter introducing the concept of the quantum geometric tensor\, I will expl
 ore the implications of the quantum geometry to flat bands\, where the qua
 siparticles have zero group velocity. I will then address the possibility 
 of using pumped light in flat Chern bands to create out-of-equilibrium exc
 itons with finite vorticity in momentum space. Those excitons\, called top
 ological excitons\, have their vorticity set by the difference between the
  Chern numbers in the conduction and valence bands. Topological excitons c
 an be found optically through the non-linear Hall effect and can condense 
 into a novel type of topological neutral superfluid with profile wavefunct
 ions in momentum space that carry a finite vorticity. \n
LOCATION:Seminar Room 3\, RDC
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