Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-03-25
Phys. Rev. B 70, 073105 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 figures
Scientific paper
10.1103/PhysRevB.70.073105
We study the one-dimensional quarter-filled extended Hubbard model with an alternating transfer integral. In the strong-dimerization limit the charge part is described by the quantum Ising model which shows the two-dimensional Ising criticality at the self-dual point, and it is naturally connected to the double-frequency sine-Gordon theory in the weak dimerization. Treating low-lying excitations in finite-size systems, we numerically determine a phase boundary between two types of $4k_{\rm F}$ density-wave states and clarify the ground-state phase diagram. Further, we refer to its relevances to the charge-ordered phase observed in the charge-transfer organic salts.
Nakamura Masaaki
Otsuka Hiromi
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