Higgs Mode of Planar Coupled Spin Ladders and its Observation in C9 H18 N2CuBr4
Ying T, Schmidt KP, Wessel S (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 122
Article Number: 127201
Journal Issue: 12
DOI: 10.1103/PhysRevLett.122.127201
Abstract
Polarized inelastic neutron scattering experiments recently identified the amplitude (Higgs) mode in C9H18N2CuBr4, a two-dimensional near-quantum-critical spin-1/2 two-leg ladder compound, which exhibits a weak easy-axis exchange anisotropy. Here, we theoretically examine the dynamic spin structure factor of such planar coupled spin-ladder systems using large-scale quantum Monte Carlo simulations. This allows us to provide a quantitative account of the experimental neutron scattering data within a consistent quantum spin model. Moreover, we trace the details of the continuous evolution of the amplitude mode from a two-particle bound state of coupled ladders in the classical Ising limit all the way to the quantum spin-1/2 Heisenberg limit with fully restored SU(2) symmetry, where it gets overdamped by the two-magnon continuum in neutron scattering.
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APA:
Ying, T., Schmidt, K.P., & Wessel, S. (2019). Higgs Mode of Planar Coupled Spin Ladders and its Observation in C9 H18 N2CuBr4. Physical Review Letters, 122(12). https://dx.doi.org/10.1103/PhysRevLett.122.127201
MLA:
Ying, T., Kai Phillip Schmidt, and S. Wessel. "Higgs Mode of Planar Coupled Spin Ladders and its Observation in C9 H18 N2CuBr4." Physical Review Letters 122.12 (2019).
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