A gapped tetramer wavefunction on the square lattice realizes a bosonic quantum charge liquid with minimal Z4 topological order at filling 3/4.
Interaction-driven metal-insulator transi- tion with charge fractionalization
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Towards a microscopic model for an electronic quantum charge liquid
A gapped tetramer wavefunction on the square lattice realizes a bosonic quantum charge liquid with minimal Z4 topological order at filling 3/4.