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• W3101428612 abstract "Understanding the nature of the excitation spectrum in quantum spin liquids is of fundamental importance, in particular for the experimental detection of candidate materials. However, current theoretical and numerical techniques have limited capabilities, especially in obtaining the dynamical structure factor, which gives a crucial characterization of the ultimate nature of the quantum state and may be directly assessed by inelastic neutron scattering. In this work, we investigate the low-energy properties of the S=1/2 Heisenberg model on the triangular lattice, including both nearest-neighbor J1 and next-nearest-neighbor J2 superexchanges, by a dynamical variational Monte Carlo approach that allows accurate results on spin models. For J2=0, our calculations are compatible with the existence of a well-defined magnon in the whole Brillouin zone, with gapless excitations at K points (i.e., at the corners of the Brillouin zone). The strong renormalization of the magnon branch (also including rotonlike minima around the M points, i.e., midpoints of the border zone) is described by our Gutzwiller-projected state, where Abrikosov fermions are subject to a nontrivial magnetic π flux threading half of the triangular plaquettes. When increasing the frustrating ratio J2/J1, we detect a progressive softening of the magnon branch at M, which eventually becomes gapless within the spin-liquid phase. This feature is captured by the band structure of the unprojected wave function (with two Dirac points for each spin component). In addition, we observe an intense signal at low energies around the K points, which cannot be understood within the unprojected picture and emerges only when the Gutzwiller projection is considered, suggesting the relevance of gauge fields for the low-energy physics of spin liquids.2 MoreReceived 21 March 2019Revised 14 June 2019DOI:https://doi.org/10.1103/PhysRevX.9.031026Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasFrustrated magnetismQuantum spin liquidTechniquesMonte Carlo methodsCondensed Matter, Materials & Applied Physics" @default.
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• W3101428612 date "2019-08-15" @default.
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• W3101428612 title "Dynamical Structure Factor of the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi>J</mml:mi><mml:mn>1</mml:mn></mml:msub><mml:mo>−</mml:mo><mml:msub><mml:mi>J</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> Heisenberg Model on the Triangular Lattice: Magnons, Spinons, and Gauge Fields" @default.
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• W3101428612 doi "https://doi.org/10.1103/physrevx.9.031026" @default.
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