Title: Revisiting Fermi Surfaces in Electronic Structure Studies
Presenter: Professor Mukunda P Das Department of Theoretical Physics, RSPE The Australian National University, Canberra, ACT 2601
Date: Wednesday 30 March 2016
Venue: LKM Theatre AIIM Facility, Innovation Campus Level 1
The Fermi surface is an abstract object in the reciprocal space for a material lattice, enclosing the set of all electronic band states that are filled according to the Pauli principle. Its topology is dictated by the underlying material structure, and its volume is the carrier density in the material. The Fermi surface is central to predictions of thermal, electrical, magnetic, optical and superconducting properties in metallic systems. Density functional theory is a first-principles method used to calculate the occupied-band energies and the Fermi energy. In this talk we survey several key facts about Fermi surfaces in complex correlated systems, where a proper theoretical understanding is still lacking. We address some critical difficulties whether the Fermi surface is a ground state property and discuss its stability in strongly correlated systems like pictides.
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