Frustration effects in an anisotropic checkerboard lattice Hubbard model

Article

关键词: RENORMALIZATION-GROUP METHOD;    PYROCHLORE LATTICE;    GEOMETRICAL FRUSTRATION;    BANDWIDTH-CONTROL;    MOTT TRANSITIONS;    LIV2O4;    SYSTEMS;    SIMULATIONS;    MAGNET;    STATES;   

DOI  :  10.1103/PhysRevB.78.165113

来源: SCIE

【 摘 要 】

We study the ground-state properties of the geometrically frustrated Hubbard model on the anisotropic checkerboard lattice with nearest-neighbor hopping t and next-nearest-neighbor hopping t('). By using the path-integral renormalization-group method, we study the phase diagram in the parameter space of the Hubbard interaction U and the frustration-control parameter t(')/t. Close examinations of the effective hopping, the double occupancy, the momentum distribution, and the spin- and charge-correlation functions allow us to determine the phase diagram at zero temperature, at which the plaquette-singlet insulator emerges besides the antiferromagnetic insulator and the paramagnetic metal. Spin-liquid insulating states without any kind of symmetry breaking cannot be found in our frustrated model.

【 授权许可】

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