Exciton formation in strongly correlated electron-hole systems near the semimetal-semiconductor transition

Abstract

The region surrounding the excitonic insulator phase is a three-component plasma composed of electrons, holes, and excitons. Due to the extended nature of the excitons, their presence influences the surrounding electrons and holes. We analyze this correlation. To this end, we calculate the density of bound electrons, the density of electrons in the correlated state, the momentum-resolved exciton density, and the momentum-resolved density of electron-hole pairs that are correlated but unbound. We find qualitative differences in the electron-hole correlations between the weak-coupling and the strong-coupling regime.

10 pages, 5 figures

References in corpus (6)

• Evidence for an excitonic insulator phase in 1T-TiSe${}_2$
• On the possibility of an excitonic insulator at the semiconductor-semimetal transition
• Models of coherent exciton condensation
• Bound state formation and nature of the excitonic insulator phase in the extended Falicov-Kimball model
• Weak-coupling Treatment of Electronic (Anti-)Ferroelectricity in the Extended Falicov-Kimball Model
• Hartree-Fock study of electronic ferroelectricity in the Falicov-Kimball model with $f$-$f$ hopping

Cited by in corpus (2)

• Sign-Free Determinant Quantum Monte Carlo Study of Excitonic Density Orders in a Two-Orbital Hubbard-Kanamori Model
• Localized excitons in 1D half-filled paramagnetic Hubbard model