Fate of the excitonic insulator in the presence of phonons. Zenker, B., Fehske, H., & Beck, H. Physical Review B, 90(19):195118, November, 2014. 285![Fate of the excitonic insulator in the presence of phonons [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex The influence of phonons on the formation of the excitonic insulator has hardly been analyzed so far. Recent experiments on Ta2NiSe5,1T−TiSe2, and TmSe0.45Te0.55, being candidates for realizing the excitonic-insulator state, suggest, however, that the underlying lattice plays a significant role. Employing the Kadanoff-Baym approach we address this issue theoretically. We show that owing to the electron-phonon coupling a static lattice distortion may arise at the excitonic instability. Most importantly such a distortion will destroy the acoustic phase mode being present if the electron-hole pairing and condensation is exclusively driven by the Coulomb interaction. The absence of off-diagonal long-range order, when lattice degrees of freedom are involved, challenges that excitons in these materials form a superfluid condensate of Bose particles or Cooper pairs composed of electrons and holes.
@article{zenker_fate_2014,
title = {Fate of the excitonic insulator in the presence of phonons},
volume = {90},
url = {http://link.aps.org/doi/10.1103/PhysRevB.90.195118},
doi = {10.1103/PhysRevB.90.195118},
abstract = {The influence of phonons on the formation of the excitonic insulator has hardly been analyzed so far. Recent experiments on Ta2NiSe5,1T−TiSe2, and TmSe0.45Te0.55, being candidates for realizing the excitonic-insulator state, suggest, however, that the underlying lattice plays a significant role. Employing the Kadanoff-Baym approach we address this issue theoretically. We show that owing to the electron-phonon coupling a static lattice distortion may arise at the excitonic instability. Most importantly such a distortion will destroy the acoustic phase mode being present if the electron-hole pairing and condensation is exclusively driven by the Coulomb interaction. The absence of off-diagonal long-range order, when lattice degrees of freedom are involved, challenges that excitons in these materials form a superfluid condensate of Bose particles or Cooper pairs composed of electrons and holes.},
number = {19},
urldate = {2015-02-05},
journal = {Physical Review B},
author = {Zenker, B. and Fehske, H. and Beck, H.},
month = nov,
year = {2014},
note = {285},
pages = {195118},
file = {APS Snapshot:/home/schlady/.zotero/zotero/za3jlr8i.default/zotero/storage/NS7SDJ5B/PhysRevB.90.html:text/html;Zenker et al_2014_Fate of the excitonic insulator in the presence of phonons.pdf:/home/schlady/.zotero/zotero/za3jlr8i.default/zotero/storage/4GMV929C/Zenker et al_2014_Fate of the excitonic insulator in the presence of phonons.pdf:application/pdf}
}
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