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

Ihle  D; Pfafferott  M; Burovski  EBronold  FXFehske  H

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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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Motivated by the possibility of pressure-induced exciton condensation in intermediate-valence TmSe,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.

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《Physical review, B. Condensed matter and materials physics》 |2008年第19期|193103-1-193103-4-0|共4页
作者
Ihle D; Pfafferott M; Burovski EBronold FXFehske H;
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作者单位

[Ihle, D] Univ Leipzig, Inst Theoret Phys, D-04109 Leipzig, Germany;

[Pfafferott, M;

Bronold, FXFehske, H] Ernst Moritz Arndt Univ Greifswald, Inst Phys, D-17487 Greifswald, Germany[Burovski, E] Univ Paris 11, Lab Phys Theor & Modeles Stat, F-91405 Orsay, France;

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正文语种英语
中图分类固体物理学;
关键词
TRANSITION; TMSE0.45TE0.55; CONDENSATION; WEAK;

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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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