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Sign-Problem—Free Quantum Monte Carlo of the Onset of Antiferromagnetism in Metals

Berg, Erez ; Metlitski, Max A. ; Sachdev, Subir

Science (American Association for the Advancement of Science), 2012-12, Vol.338 (6114), p.1606-1609 [Periódico revisado por pares]

Washington, DC: American Association for the Advancement of Science

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Título:
Sign-Problem—Free Quantum Monte Carlo of the Onset of Antiferromagnetism in Metals
Autor: Berg, Erez ; Metlitski, Max A. ; Sachdev, Subir
Assuntos: Antiferromagnetism ; Atoms & subatomic particles ; Condensed matter physics ; Condensed matter: electronic structure, electrical, magnetic, and optical properties ; COPPER OXIDE ; Critical points ; ELECTRICAL CONDUCTIVITY ; Electronic structure ; Electrons ; Exact sciences and technology ; Fermi surfaces ; Fermions ; MAGNETIC PROPERTIES ; MATHEMATICAL ANALYSIS ; Mathematical models ; Mechanical oscillators ; Metals ; Monte Carlo methods ; Monte Carlo simulation ; Partitions ; Physics ; Properties of type I and type II superconductors ; Quantum field theory ; Quantum mechanics ; SOLID STATE PHYSICS ; Sums ; Superconductivity ; SUPERCONDUCTORS
É parte de: Science (American Association for the Advancement of Science), 2012-12, Vol.338 (6114), p.1606-1609
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: The quantum theory of antiferromagnetism in metals is necessary for our understanding of numerous intermetallic compounds of widespread interest. In these systems, a quantum critical point emerges as external parameters (such as chemical doping) are varied. Because of the strong coupling nature of this critical point and the "sign problem" plaguing numerical quantum Monte Carlo (QMC) methods, its theoretical understanding is still incomplete. Here, we show that the universal low-energy theory for the onset of antiferromagnetism in a metal can be realized in lattice models, which are free from the sign problem and hence can be simulated efficiently with QMC. Our simulations show Fermi surface reconstruction and unconventional spin-singlet superconductivity across the critical point.
Editor: Washington, DC: American Association for the Advancement of Science
Idioma: Inglês

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Sign-Problem—Free Quantum Monte Carlo of the Onset of Antiferromagnetism in Metals

Berg, Erez ; Metlitski, Max A. ; Sachdev, Subir

Washington, DC: American Association for the Advancement of Science

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