Excitonic instability at the spin-state transition in the two-band Hubbard model

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F14%3A00432279" target="_blank" >RIV/68378271:_____/14:00432279 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevB.89.115134" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.89.115134</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.89.115134" target="_blank" >10.1103/PhysRevB.89.115134</a>

Result language
angličtina
Original language name
Excitonic instability at the spin-state transition in the two-band Hubbard model
Original language description
Using linear response theory with the dynamical mean-field approximation we investigate the particle-hole instabilities of the two-band Hubbard model in the vicinity of the spin-state transition. Besides the previously reported high-spin?low-spin order we find an instability towards triplet excitonic condensate. We discuss the strong and weak-coupling limits of the model, in particular, a connection to the spinful hard-core bosons with a nearest-neighbor interaction. Possible realization in perovskite cobaltites is briefly discussed.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Project
<a href="/en/project/GA13-25251S" target="_blank" >GA13-25251S: Strong electron correlations in systems with spin-orbit coupling</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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