Dilution Effects in Two-dimensional Quantum Orbital System

Details Dilution Effects in Two-dimensional Quantum Orbital System Dilution Effects in Two-dimensional Quantum Orbital System

2006-10-10

arxiv.org/abs/cond-mat/0610248v1

Physics

Condensed Matter

Strongly Correlated Electrons

5pages, 4 figures

Scientific paper

10.1103/PhysRevLett.98.256402

We study dilution effects in a Mott insulating state with quantum orbital degree of freedom, termed the two-dimensional orbital compass model. This is a quantum and two-dimensional version of the orbital model where the interactions along different bond directions cause frustration between different orbital configurations. A long-range correlation of a kind of orbital at each row or column, termed the directional order, is studied by means of the quantum Monte-Carlo method. It is shown that decrease of the ordering temperature due to dilution is much stronger than that in spin models. Quantum effect enhances the effective dimensionality in the system and makes the directional order robust against dilution. We discuss an essential mechanism of the dilute orbital systems.

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