Archive 2017

Here you can find past events of the MPSD institute.

Speaker: Ryan Requist Location: CFEL (Bldg. 99)

Ryan Requist - Reduced formula for the macroscopic polarization including quantum Fluctuations

MPSD Seminar
The macroscopic polarization of a solid is an fundamental quantity from which permittivity and piezoelectric tensors can be derived. The Berry phase formula of King-Smith and Vanderbilt expresses the macroscopic polarization in terms of the Bloch states of a mean-field band structure, almost invariably taken from density functional theory. Although this procedure has been successful for many materials, quantum fluctuations cause it to break down in strongly correlated systems. [more]
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