Exact low-temperature properties of a class of highly frustrated Hubbard models
2009 | journal article. A publication with affiliation to the University of Göttingen.
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- Authors
- Derzhko, Oleg; Honecker, Andreas; Richter, Johannes
- Abstract
- We study the repulsive Hubbard model both analytically and numerically on a family of highly frustrated lattices which have one-electron states localized on isolated trapping cells. We construct and count exact many-electron ground states for a wide range of electron densities and obtain closed-form expressions for the low-temperature thermodynamic quantities which are universal for all lattices of the family. Furthermore, we find that saturated ferromagnetism is obtained only for sufficiently high electron densities and large Hubbard repulsion U while there is no finite average moment in the ground states at lower densities.
- Issue Date
- 2009
- Status
- published
- Publisher
- Amer Physical Soc
- Journal
- PHYSICAL REVIEW B
- ISSN
- 1098-0121
- Sponsor
- DFG [RI 615/ 18-1]; Heisenberg [2325/4-1]