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000885474 1001_ $$0P:(DE-HGF)0$$aHohenadler, Martin$$b0
000885474 245__ $$aOrthogonal metal in the Hubbard model with liberated slave spins
000885474 260__ $$aWoodbury, NY$$bInst.$$c2019
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000885474 520__ $$aA two-dimensional Falicov-Kimball model, equivalent to the Hubbard model in an unconstrained slave-spin representation, is studied by quantum Monte Carlo simulations. The focus is on a fractionalized metallic phase that is characterized in terms of spectral, thermodynamic, and transport properties, including a comparison to the half-filled Hubbard model. The properties of this phase, most notably a single-particle gap but gapless spin and charge excitations, can in principle be understood in the framework of orthogonal metals. However, important and interesting differences arise in the present setting compared to single-particle mean-field theories and other models. We also discuss the role of the local constraints from the slave-spin representation within an extended phase diagram that includes the spatial dimension as a parameter, thereby making contact with previous work in infinite dimensions. Finally, we highlight the absence of $π$-flux configurations in the slave-spin formulation, in particular in the context of topologically ordered fractional phases predicted at the mean-field level.
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000885474 536__ $$0G:(DE-Juel1)hwb03_20190501$$aNumerical simulations of strongly correlated electron systems. (hwb03_20190501)$$chwb03_20190501$$fNumerical simulations of strongly correlated electron systems.$$x1
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