Nonlinear spectroscopy of random quantum magnets
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...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
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American Physical Society
2020
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| _version_ | 1826272434844598272 |
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| author | Parameswaran, SA Gopalakrishnan, S |
| author_facet | Parameswaran, SA Gopalakrishnan, S |
| author_sort | Parameswaran, SA |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-06T22:12:31Z |
| format | Journal article |
| id | oxford-uuid:524e4075-b4af-4666-b202-3a28a933e0ca |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:12:31Z |
| publishDate | 2020 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:524e4075-b4af-4666-b202-3a28a933e0ca2022-03-26T16:24:45ZNonlinear spectroscopy of random quantum magnetsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:524e4075-b4af-4666-b202-3a28a933e0caEnglishSymplectic ElementsAmerican Physical Society2020Parameswaran, SAGopalakrishnan, SWe 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. |
| spellingShingle | Parameswaran, SA Gopalakrishnan, S Nonlinear spectroscopy of random quantum magnets |
| title | Nonlinear spectroscopy of random quantum magnets |
| title_full | Nonlinear spectroscopy of random quantum magnets |
| title_fullStr | Nonlinear spectroscopy of random quantum magnets |
| title_full_unstemmed | Nonlinear spectroscopy of random quantum magnets |
| title_short | Nonlinear spectroscopy of random quantum magnets |
| title_sort | nonlinear spectroscopy of random quantum magnets |
| work_keys_str_mv | AT parameswaransa nonlinearspectroscopyofrandomquantummagnets AT gopalakrishnans nonlinearspectroscopyofrandomquantummagnets |