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Title: Generalized plaquette state in the anisotropic Shastry-Sutherland model
Authors: Zhang, Zhifeng
Sengupta, Pinaki
Keywords: Physics and Applied Physics
Issue Date: 2015
Source: Zhang, Z., & Sengupta, P. (2015). Generalized plaquette state in the anisotropic Shastry-Sutherland model. Physical Review B, 92, 094440-.
Series/Report no.: Physical Review B
Abstract: We use a generalized Schwinger boson approach to investigate the nature of the intermediate phase (separating the antiferromagnetic and dimer phases) in the Shastry-Sutherland model with exchange anisotropy. Our results confirm the plaquette nature of the intermediate phase and demonstrate that exchange anisotropy (both Ising-like and XY-like) weakens the plaquette order and ultimately suppresses it altogether for sufficiently strong anisotropy. Interestingly, we find that the low-energy excitation spectrum of the plaquette state changes dramatically near the boundary with the dimer phase—the location of the minimum in the (gapped) lowest excitation mode changes from k=(0,0) to four degenerate points.
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.92.094440
Schools: School of Physical and Mathematical Sciences 
Rights: © 2015 American Physical Society. This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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