Direct Observation of Collective Electronuclear Modes about a Quantum Critical Point

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.

Item Type:

Article

Related URLs:

URL	URL Type	Description
https://doi.org/10.1103/PhysRevLett.127.207202	DOI	Article
https://arxiv.org/abs/2101.05143	arXiv	Discussion Paper

ORCID:

Author	ORCID
McKenzie, R. D.	0000-0001-5265-7635
Silevitch, D. M.	0000-0002-6347-3513

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.

Funders:

Funding Agency	Grant Number
Department of Energy (DOE)	DE-SC0014866
Simons Foundation	568762
NSF	PHY-1733907
Natural Sciences and Engineering Research Council of Canada (NSERC)	RGPIN-2019-05582

Issue or Number:

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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