Libersky, M. and McKenzie, R. D. and Silevitch, D. M. and Stamp, P. C. E. and Rosenbaum, T. F. (2021) Direct Observation of Collective Electronuclear Modes about a Quantum Critical Point. Physical Review Letters, 127 (20). Art. No. 207202. ISSN 0031-9007. doi:10.1103/PhysRevLett.127.207202. https://resolver.caltech.edu/CaltechAUTHORS:20210202-095237849
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Abstract
We directly measure the low energy excitation modes of the quantum Ising magnet LiHoF₄ using microwave spectroscopy. Instead of a single electronic mode, we find a set of collective electronuclear modes, in which the spin-1/2 Ising electronic spins hybridize with the bath of spin-7/2 Ho nuclear spins. The lowest-lying electronuclear mode softens at the approach to the quantum critical point, even in the presence of disorder. This softening is rapidly quenched by a longitudinal magnetic field. Similar electronuclear structures should exist in other spin-based quantum Ising systems.
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Alternate Title: | Direct Measurement of the Soft Mode Driving a Quantum Phase Transition | ||||||||||
Additional Information: | © 2021 American Physical Society. Received 12 January 2021; revised 12 July 2021; accepted 13 October 2021; published 12 November 2021. The experimental work at Caltech was supported by the U.S. Department of Energy Basic Energy Sciences Award No. DE-SC0014866. P. C. E. S. acknowledges support at Caltech from Simons Foundation Grant No. 568762 and National Science Foundation Grant No. PHY-1733907. Theoretical work at UBC was supported by the National Sciences and Engineering Research Council of Canada, No. RGPIN-2019-05582. | ||||||||||
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Issue or Number: | 20 | ||||||||||
DOI: | 10.1103/PhysRevLett.127.207202 | ||||||||||
Record Number: | CaltechAUTHORS:20210202-095237849 | ||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20210202-095237849 | ||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||
ID Code: | 107858 | ||||||||||
Collection: | CaltechAUTHORS | ||||||||||
Deposited By: | George Porter | ||||||||||
Deposited On: | 03 Feb 2021 21:32 | ||||||||||
Last Modified: | 23 Nov 2021 16:48 |
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