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SUMMARY:Adiabatic description of piezoelectricity - Christof Sparber (DAMT
 P)
DTSTART:20090119T160000Z
DTEND:20090119T170000Z
UID:TALK16407@talks.cam.ac.uk
CONTACT:Prof. Mihalis Dafermos
DESCRIPTION:As a simple model for piezoelectricity we consider a gas of in
 finitely many non-interacting electrons subject to a slowly time-dependent
  periodic potential. We show that in the adiabatic limit the macroscopic c
 urrent is determined by the geometry of the corresponding Bloch eigenfunct
 ions. As a consequence we obtain the King-Smith and Vanderbilt formula up 
 to errors smaller than any power of the adiabatic parameter.\n\n
LOCATION:CMS\, MR13
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