Spectral functions and optical conductivity of spinless fermions on a checkerboard lattice
F. Pollmann, P. Fulde, E. Runge
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.
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