BCS–BEC Crossover of Triplet Exciton Condensation in Bilayer Systems
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- Hidemaro Suwa
- Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
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- Shang-Shun Zhang
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, U.S.A.
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- Cristian D. Batista
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, U.S.A.
説明
We study the BCS-BEC crossover phenomenon of triplet exciton condensation using a half-filled bilayer Hubbard model. We calculate the dynamical spin structure factor and the exciton wave function on the phase boundary between the antiferromagnetically ordered and disordered phases. In the BCS regime, the formation and condensation of particle-hole bound states, namely excitons, occur simultaneously at the phase transition point, and the exciton wave function is extended in real space. In the BEC regime, on the other hand, bound states are well defined over the whole Brillouin zone also in the disordered phase, and the size of particle-hole pairs is smaller than a lattice space. Quantum criticality of charge-spin-orbital entangled states can emerge from intermediate coupling materials in the crossover regime.
6 pages, 3 figures, accepted in JPS Conference Proceedings (LT29)
収録刊行物
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- Proceedings of the 29th International Conference on Low Temperature Physics (LT29)
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Proceedings of the 29th International Conference on Low Temperature Physics (LT29) 2023-05-22
Journal of the Physical Society of Japan
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詳細情報 詳細情報について
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- CRID
- 1360302864796147712
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE