Spectral functions and optical conductivity of spinless fermions on a checkerboard lattice

Abstract

We study the dynamical properties of spinless fermions on the checkerboard lattice. Our main interest is the limit of large nearest-neighbor repulsion $V$ as compared with hopping $|t|$. The spectral functions show broad low-energy excitation which are due to the dynamics of fractionally charged excitations. Furthermore, it is shown that the fractional charges contribute to the electrical current density.

arXiv comment9 Pages, 9 Figures

References in corpus (8)

• Pyrochlore Photons: The U(1) Spin Liquid in a S=1/2 Three-Dimensional Frustrated Magnet
• High-temperature superfluidity of fermionic atoms in optical lattices
• Three dimensional resonating valence bond liquids and their excitations
• Cyclic exchange, isolated states and spinon deconfinement in an XXZ Heisenberg model on the checkerboard lattice
• Fractional charges in pyrochlore lattices
• Spin-Charge Separation in Two-dimensional Frustrated Quantum Magnets
• Metal-insulator transition in the quarter- filled frustrated checkerboard lattice
• Hardcore bosons on checkerboard lattices near half filling: geometric frustration, vanishing charge order and fractional phase

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• Phase diagram of the Cairo pentagonal XXZ spin-1/2 magnet under a magnetic field
• Ground State Degeneracy of Interacting Spinless Fermions
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• Quantum Melting of Valence Bond Crystal Insulators and Novel Supersolid Phase at Commensurate Density
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• Charge degrees in the quarter-filled checkerboard lattice
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