Asymptotically Exact Theory for Nonlinear Spectroscopy of Random Quantum Magnets

S. A. Parameswaran, S. Gopalakrishnan

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We study nonlinear response in quantum spin systems near infinite-randomness critical points. Nonlinear dynamical probes, such as two-dimensional (2D) coherent spectroscopy, can diagnose the nearly localized character of excitations in such systems. We present exact results for nonlinear response in the 1D random transverse-field Ising model, from which we extract information about critical behavior that is absent in linear response. Our analysis yields exact scaling forms for the distribution functions of relaxation times that result from realistic channels for dissipation in random magnets. We argue that our results capture the scaling of relaxation times and nonlinear response in generic random quantum magnets in any spatial dimension.

Original languageEnglish (US)
Article number237601
JournalPhysical review letters
Issue number23
StatePublished - Dec 2 2020

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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