Fractional charge excitations in fermionic ladders
B. N. Narozhny, S. T. Carr, A. A. Nersesyan
Abstract
The system of interacting spinless fermions hopping on a two-leg ladder in the presence of an external magnetic field is shown to possess a long range order: the bond density wave or the staggered flux phase. In both cases the elementary excitations are Z2 kinks and carry one half the charge of an electron.
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