Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-03-19
Physica B404 (2009) 3316-3319
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages including 5 figures; to appear in Physica B (proceedings of SCES 2008)
Scientific paper
10.1016/j.physb.2009.07.092
Highly frustrated lattices yield a completely flat lowest single-electron band. Remarkably, exact many-body ground states can be constructed for the repulsive Hubbard model and the t-J model by filling this flat band with localized electron states. This construction leads to a macroscopic ground-state degeneracy. We discuss how to compute these ground-state degeneracies for a certain class of models, including in particular the sawtooth chain. Furthermore, we discuss generic consequences for low-temperature thermodynamic properties, like the appearance of a low-temperature peak in the specific heat. Finally, we present complementary numerical results obtained by exact diagonalization.
Derzhko Oleg
Honecker Andreas
Richter Jadwiga
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