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.


Prof. J. Hancock

Physics Department (primary), UConn Master Calendar

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