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 superconducti...

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Bibliographic Details
Published in:Physical review letters 2016-08, Vol.117 (9), p.097002-097002, Article 097002
Main Authors: Schattner, Yoni, Gerlach, Max H, Trebst, Simon, Berg, Erez
Format: Article
Language:English
Subjects:
Computer simulation
Electronics
Fluctuation
Mathematical models
Monte Carlo methods
Phase transformations
Superconductivity
Unconventional superconductors
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.117.097002