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Bound state formation and the nature of the excitonic insulator phase in the extended Falicov-Kimball model

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Bound state formation and the nature of the excitonic insulator phase in the extended Falicov-Kimball model. / Ihle, D; Pfafferott, M; Burovski, Evgeni et al.
In: Physical review B, Vol. 78, No. 19, 193103, 15.11.2008.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Ihle, D, Pfafferott, M, Burovski, E, Bronold, FX & Fehske, H 2008, 'Bound state formation and the nature of the excitonic insulator phase in the extended Falicov-Kimball model', Physical review B, vol. 78, no. 19, 193103. https://doi.org/10.1103/PhysRevB.78.193103

APA

Ihle, D., Pfafferott, M., Burovski, E., Bronold, F. X., & Fehske, H. (2008). Bound state formation and the nature of the excitonic insulator phase in the extended Falicov-Kimball model. Physical review B, 78(19), Article 193103. https://doi.org/10.1103/PhysRevB.78.193103

Vancouver

Ihle D, Pfafferott M, Burovski E, Bronold FX, Fehske H. Bound state formation and the nature of the excitonic insulator phase in the extended Falicov-Kimball model. Physical review B. 2008 Nov 15;78(19):193103. doi: 10.1103/PhysRevB.78.193103

Author

Ihle, D ; Pfafferott, M ; Burovski, Evgeni et al. / Bound state formation and the nature of the excitonic insulator phase in the extended Falicov-Kimball model. In: Physical review B. 2008 ; Vol. 78, No. 19.

Bibtex

@article{2c27eccda8624c179c475f1455f80e2f,
title = "Bound state formation and the nature of the excitonic insulator phase in the extended Falicov-Kimball model",
abstract = "Motivated by the possibility of pressure-induced exciton condensation in intermediate-valence Tm[Se,Te] compounds, we study the Falicov-Kimball model extended by a finite f-hole valence bandwidth. Calculating the Frenkel-type exciton propagator we obtain excitonic bound states above a characteristic value of the local interband Coulomb attraction. Depending on the system parameters coherence between c and f states may be established at low temperatures, leading to an excitonic insulator phase. We find strong evidence that the excitonic insulator typifies either a BCS condensate of electron-hole pairs (weak-coupling regime) or a Bose-Einstein condensate (BEC) of preformed excitons (strong-coupling regime), which points toward a BCS-BEC transition scenario as Coulomb correlations increase.",
author = "D Ihle and M Pfafferott and Evgeni Burovski and F.X. Bronold and H Fehske",
year = "2008",
month = nov,
day = "15",
doi = "10.1103/PhysRevB.78.193103",
language = "English",
volume = "78",
journal = "Physical review B",
issn = "1098-0121",
publisher = "AMER PHYSICAL SOC",
number = "19",

}

RIS

TY - JOUR

T1 - Bound state formation and the nature of the excitonic insulator phase in the extended Falicov-Kimball model

AU - Ihle, D

AU - Pfafferott, M

AU - Burovski, Evgeni

AU - Bronold, F.X.

AU - Fehske, H

PY - 2008/11/15

Y1 - 2008/11/15

N2 - Motivated by the possibility of pressure-induced exciton condensation in intermediate-valence Tm[Se,Te] compounds, we study the Falicov-Kimball model extended by a finite f-hole valence bandwidth. Calculating the Frenkel-type exciton propagator we obtain excitonic bound states above a characteristic value of the local interband Coulomb attraction. Depending on the system parameters coherence between c and f states may be established at low temperatures, leading to an excitonic insulator phase. We find strong evidence that the excitonic insulator typifies either a BCS condensate of electron-hole pairs (weak-coupling regime) or a Bose-Einstein condensate (BEC) of preformed excitons (strong-coupling regime), which points toward a BCS-BEC transition scenario as Coulomb correlations increase.

AB - Motivated by the possibility of pressure-induced exciton condensation in intermediate-valence Tm[Se,Te] compounds, we study the Falicov-Kimball model extended by a finite f-hole valence bandwidth. Calculating the Frenkel-type exciton propagator we obtain excitonic bound states above a characteristic value of the local interband Coulomb attraction. Depending on the system parameters coherence between c and f states may be established at low temperatures, leading to an excitonic insulator phase. We find strong evidence that the excitonic insulator typifies either a BCS condensate of electron-hole pairs (weak-coupling regime) or a Bose-Einstein condensate (BEC) of preformed excitons (strong-coupling regime), which points toward a BCS-BEC transition scenario as Coulomb correlations increase.

U2 - 10.1103/PhysRevB.78.193103

DO - 10.1103/PhysRevB.78.193103

M3 - Journal article

VL - 78

JO - Physical review B

JF - Physical review B

SN - 1098-0121

IS - 19

M1 - 193103

ER -