Higgs Mode of Planar Coupled Spin Ladders and its Observation in C9H18N2CuBr4

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Details zur Publikation

Autorinnen und Autoren: Ying T, Schmidt KP, Wessel S
Zeitschrift: Physical Review Letters
Jahr der Veröffentlichung: 2019
Band: 122
Heftnummer: 11
ISSN: 0031-9007
eISSN: 1079-7114


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.

FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Schmidt, Kai Phillip Prof. Dr.
Professur für Theoretische Physik

Einrichtungen weiterer Autorinnen und Autoren

Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen


Ying, T., Schmidt, K.P., & Wessel, S. (2019). Higgs Mode of Planar Coupled Spin Ladders and its Observation in C9H18N2CuBr4. Physical Review Letters, 122(11). https://dx.doi.org/10.1103/PhysRevLett.122.127201

Ying, T., Kai Phillip Schmidt, and S. Wessel. "Higgs Mode of Planar Coupled Spin Ladders and its Observation in C9H18N2CuBr4." Physical Review Letters 122.11 (2019).


Zuletzt aktualisiert 2019-09-09 um 14:10