Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session B64: Quantum Spin Liquids
11:30 AM–2:30 PM,
Monday, March 14, 2022
Room: Hyatt Regency Hotel -Grant Park B
Sponsoring
Unit:
DCMP
Chair: Matthew Enjalran, Southern Conn State Univ
Abstract: B64.00004 : Quantum spin-glass criticality in disordered frustrated dimer magnets
12:06 PM–12:18 PM
Presenter:
Darshan G Joshi
(Harvard University)
Authors:
Darshan G Joshi
(Harvard University)
Matthias Vojta
(Technical University of Dresden, Germany)
We study the effect of quenched disorder on non-collinear magnetism in frustrated quantum magnets near quantum criticality. Specifically, we consider a triangular-lattice bilayer Heisenberg model with bond disorder. The clean system has two phases: a dimer quantum paramagnet and a 120° Neel phase, separated by a quantum critical point. Intralayer bond disorder destroys the 120° Neel phase via dipolar textures and results in spin-glass order, such that the system features a quantum phase transition between spin-glass and dimer paramagnetic phases. We study the vicinity of this transition using variant of bond-operator theory and calculate static observables as well as excitation spectra. Bond disorder leads to strong inhomogeneities near the transition and induces real-space localization of excitation modes. In particular, the spin-glass order parameter displays strong quantum fluctuations, indicating the proximity to a spin-liquid-like phase.
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