Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point
Hong T, Matsumoto M, Qiu Y, Chen W, Gentile TR, Watson S, Awwadi FF, Turnbull MM, Dissanayake SE, Agrawal H, Toft-Petersen R, Klemke B, Coester K, Schmidt KP, Tennant DA (2017)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2017
Journal
Publisher: NATURE PUBLISHING GROUP
Book Volume: 13
Pages Range: 638-+
Journal Issue: 7
DOI: 10.1038/NPHYS4182
Abstract
Spontaneous symmetry-breaking quantum phase transitions play an essential role in condensed-matter physics(1-3). The collective excitations in the broken-symmetry phase near the quantum critical point can be characterized by fluctuations of phase and amplitude of the order parameter. The phase oscillations correspond to the massless Nambu-Goldstone modes whereas the massive amplitude mode, analogous to the Higgs boson in particle physics(4,5), is prone to decay into a pair of low-energy Nambu-Goldstone modes in low dimensions(2,6,7). Especially, observation of a Higgs amplitude mode in two dimensions is an outstanding experimental challenge. Here, using inelastic neutron scattering and applying the bondoperator theory, we directly and unambiguously identify the Higgs amplitude mode in a two-dimensional S = 1/2 quantum antiferromagnet C9H18N2CuBr4 near a quantum critical point in two dimensions. Owing to an anisotropic energy gap, it kinematically prevents such decay and the Higgs amplitude mode acquires an infinite lifetime.
Authors with CRIS profile
Involved external institutions
Oak Ridge National Laboratory
United States (USA) (US)
Technische Universität Dortmund
Germany (DE)
Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Germany (DE)
Clark University
United States (USA) (US)
University of Jordan
Jordan (JO)
National Institute of Standards and Technology (NIST)
United States (USA) (US)
Shizuoka University / 静岡大学
Japan (JP)
United States (USA) (US)
Technische Universität Dortmund
Germany (DE)
Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Germany (DE)
Clark University
United States (USA) (US)
University of Jordan
Jordan (JO)
National Institute of Standards and Technology (NIST)
United States (USA) (US)
Shizuoka University / 静岡大学
Japan (JP)
How to cite
APA:
Hong, T., Matsumoto, M., Qiu, Y., Chen, W., Gentile, T.R., Watson, S.,... Tennant, D.A. (2017). Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point. Nature, 13(7), 638-+. https://dx.doi.org/10.1038/NPHYS4182
MLA:
Hong, Tao, et al. "Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point." Nature 13.7 (2017): 638-+.
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