Quantum phase transitions in holographic models of magnetism and superconductors
Name
Iqbal-2010-Quantum phase transi.pdf
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1.86 MB
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Author(s)
Liu, Hong
Iqbal, Nabil
Mezei, Mark Koppany
Si, Qimiao
Date Issued
August 2010
Journal
Physical Review D
Publisher
American Physical Society
Citation
Iqbal, Nabil et al. “Quantum phase transitions in holographic models of magnetism and superconductors.” Physical Review D 82.4 (2010): 045002. © 2010 The American Physical Society.
Version
Final published version
Abstract
We study a holographic model realizing an “antiferromagnetic” phase in which a global SU(2) symmetry representing spin is broken down to a U(1) by the presence of a finite electric charge density. This involves the condensation of a neutral scalar field in a charged anti–de Sitter black hole. We observe that the phase transition for both neutral and charged (as in the standard holographic superconductor) order parameters can be driven to zero temperature by a tuning of the UV conformal dimension of the order parameter, resulting in a quantum phase transition of the Berezinskii-Kosterlitz-Thouless–type. We also characterize the antiferromagnetic phase and an externally forced ferromagnetic phase by showing that they contain the expected spin waves with linear and quadratic dispersions, respectively.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.82.045002
