Quantum Melting of Valence Bond Crystal Insulators and Novel Supersolid Phase at Commensurate Density

Details Quantum Melting of Valence Bond Crystal Insulators and Novel Supersolid Phase at Commensurate Density Quantum Melting of Valence Bond Crystal Insulators and Novel Supersolid Phase at Commensurate Density

2009-12-10

arxiv.org/abs/0912.2036v2

Phys. Rev. Lett. 104, 127203 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures; added references, improved content; fitting with PRL format

Scientific paper

10.1103/PhysRevLett.104.127203

Bosonic and fermionic Hubbard models on the checkerboard lattice are studied numerically for infinite on-site repulsion. At particle density n=1/4 and strong nearest-neighbor repulsion, insulating Valence Bond Crystals (VBC) of resonating particle pairs are stabilized. Their melting into superfluid/metallic phases under increasing hopping is investigated at T=0K. More specifically, we identify a novel and unconventional commensurate VBC supersolid region, precursor to the melting of the bosonic crystal. Hardcore bosons (spins) are compared to fermions (electrons), as well as positive to negative (frustrating) hoppings.

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