Exciton Bose Liquid in a Hard-Core Boson Ring Mod

6 Jan 2011, 10:50
50m
FB54

FB54

Speaker

Olexei Motrunich (Caltech) (Caltech)

Description

I will present our Quantum Monte Carlo studies of hard-core boson Hamiltonians with ring-only interactions on the 2D square lattice searching for a so-called Excitonic Bose Liquid (EBL). This phase, which can be viewed as a special type of "Bose metal", had eluded numerical realization since the first proposal a decade ago, as the original model showed either charge-order at half-filling or phase separation at generic density. By a minimal modification of the model by including more extended ring exchanges, we are able to stabilize the EBL both at half-filling and away from half-filling and start confronting the EBL theory with unbiased numerical results. I will also describe a parton-gauge perspective on the EBL and some lessons for Gutzwiller-type wavefunctions

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