Veranstaltungsarchiv 2017

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MPSD Seminar

10930 1504601626

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

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. [mehr]

 
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