Erez Berg, Max A. Metlitski, Subir Sachdev
The onset of antiferromagnetism in two-dimensional metals is described at low energies by excitations in the vicinity of a finite number of "hot spots" on the Fermi surface. We demonstrate that by deforming the Fermi surface far from the hot spots, but leaving the vicinities of the hot spots unchanged, we can obtain a model which eliminates the sign problem of quantum Monte Carlo simulations. This opens the way towards large-scale numerical studies of a strongly-coupled quantum critical point in a metal. Results showing Fermi surface reconstruction and unconventional spin-singlet superconductivity across the critical point are obtained.
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http://arxiv.org/abs/1206.0742
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