Collective excitations and stability of the excitonic phase in the extended Falicov-Kimball model

We consider the excitonic insulator state (often associated with electronic ferroelectricity), which arises on the phase diagram of an extended spinless Falicov-Kimball model (FKM) at half-filling. Within the Hartree-Fock approach, we calculate the spectrum of low-energy collective excitations in th...

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Veröffentlicht in:	Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-10, Vol.86 (15), Article 155134
1. Verfasser:	Golosov, D. I.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter Electronics Excitation Excitation spectra Insulators Low energy Phase diagrams Stability
Online-Zugang:	Volltext
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