Competing Orders in a Nearly Antiferromagnetic Metal.
We study the onset of spin-density wave order in itinerant electron systems via a two-dimensional lattice model amenable to numerically exact, sign-problem-free determinantal quantum Monte Carlo simulations. The finite-temperature phase diagram of the model reveals a dome-shaped d-wave superconducting phase near the magnetic quantum phase transition. Above the critical superconducting temperature, an extended fluctuation regime manifests itself in the opening of a gap in the electronic density of states and an enhanced diamagnetic response. While charge density wave fluctuations are moderately enhanced in the proximity of the magnetic quantum phase transition, they remain short ranged. The striking similarity of our results to the phenomenology of many unconventional superconductors points a way to a microscopic understanding of such strongly coupled systems in a controlled manner.
Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
Yoni
Y
Schattner
Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany.
Max H
MH
Gerlach
Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany.
Simon
S
Trebst
Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
Erez
E
Berg