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Excitonic Insulator phase in Topological Energy Bands
,
M.Sc. Thesis
Sharif University of Technology
;
Kargarian, Mehdi
(Supervisor)
Abstract
Genetically the equilibrium and nonequilibrium collective properties of the electron system depend upon the strength of interaction between electrons, and of course between electrons and other degrees of freedom such as phonons. One of the collective states is the so-called exciton, a bound state of electron and hole in narrow-band semiconductors. The bound states give rise to absorption peaks below the gap in optical conductivity measurements.Excitonic insulator is an interesting phase of matter where the ground state is characterized by a coherent ondensation of exciton, much like the condensation of Cooper pairs in superconductors. Despite being introduced and theorized more than five...