University of Connecticut

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Condensed Matter Physics Seminar

Tuesday, November 28, 2017
2:00pm – 3:00pm

Storrs Campus
Physics Building, P121

Adil-Gerai Kussow, Department of Physics, University of Massachusetts, Lowell

Quasiparticles in a periodic crystal lattice from two-particle electronic excitations: many-electron fermionic wave function

A novel first-principle theory of the quasiparticles in a periodic crystal lattice described in terms of two-particle electronic excitations has been formulated. The many-electronic system is treated as an ensemble of two-electron excitations which describe the electron-electron scatterings in the field of the core ions. This concept is an alternative to the one-electron effective field approach and neither the density-functional formalism nor the semiclassical electron gas model are utilized. The many-electron wave function, which provides, due to the fermionic antisymmetry embedded, the full description of the electronic exchange-correlation effects, is calculated. Based on the non-perturbative Green Function method, in a unified manner, both the ground and the excitation states of a lattice, with any degree of the exchange-correlation interactions, are evaluated. It is shown that this scheme, if compared with Hedin GW, considerably simplifies the calculation of the quasiparticle energies.

Contact:

Prof. J. Hancock

Physics Department (primary)

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