Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-10-14
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 10 figures
Scientific paper
10.1143/JPSJ.73.687
The dynamics of a doped hole in the orthogonal-dimer spin system is investigated systematically in one, two and three dimensions. By combining the bond-operator method with the self-consistent Born approximation, we argue that a dispersive quasi-particle state in the dimer phase is well defined even for quasi-two-dimensional systems. On the other hand, a doped hole in the plaquette-singlet phase hardly itinerates, forming an almost localized mode. We further clarify that although the quasi-particle weight in the dimer phase is decreased in the presence of the interchain coupling, it is not suppressed but even enhanced upon the introduction of the interlayer coupling.
Kawakami Norio
Koga Akihisa
Saito Yukio
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