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ICMT Seminar: "Understanding many-particle effects: accurate theories for liquids and electronic excited states in solids"

Event Type
Dept. of Physics
190 ESB
Apr 8, 2013   12:00 pm  
Dr. Johannes Lischner (Berkeley)
Becky McDuffee
Originating Calendar
Physics - Institute for Condensed Matter Theory Seminar

The calculation of material properties usually requires a detailed understanding

of the interactions between the microscopic constituents. In my talk I will first

discuss a microscopically informed continuum theory which allows for accurate and efficient modeling of  interacting inhomogeneous molecular liquids, such as liquid water, and the description of solvation processes and liquid-solid interfaces. Then I will discuss  accurate theories to describe angle-resolved photoemission experiments. In particular, I will discuss two systems where many-electron interaction effects result in qualitative differences from the non-interacting (or mean-field) picture: in open-shell defects, electron-electron interactions cause a multiplet structure in the photoemission spectra. In doped graphene, the interaction of plasmons with the chiral Dirac fermions results in a reconstruction of the Dirac cone band structure. I will explain these observations using first-principles theories that include interactions beyond density-functional theory, such as ab initio GW theory and GW+cumulant theory.

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