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Tuning high-Q nonlinear dynamics in a disordered quantum magnet

Silevitch, D. M. and Tang, C. and Aeppli, G. and Rosenbaum, T. F. (2019) Tuning high-Q nonlinear dynamics in a disordered quantum magnet. Nature Communications, 10 . Art. No. 4001. ISSN 2041-1723. PMCID PMC6728381. doi:10.1038/s41467-019-11985-1.

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Quantum states cohere and interfere. Atoms arranged imperfectly in a solid rarely display these properties. Here we demonstrate an exception in a disordered quantum magnet that divides itself into nearly isolated subsystems. We probe these coherent spin clusters by driving the system nonlinearly and measuring the resulting hole in the linear spectral response. The Fano shape of the hole encodes the incoherent lifetime as well as coherent mixing of the localized excitations. For the Ising magnet LiHo_(0.045)Y_(0.955)F_4, the quality factor Q for spectral holes can be as high as 100,000. We tune the dynamics by sweeping the Fano mixing parameter qthrough zero via the ac pump amplitude as well as a dc transverse field. The zero crossing of q is associated with a dissipationless response at the drive frequency. Identifying localized two-level systems in a dense and disordered magnet advances the search for qubit platforms emerging from strongly interacting, many-body systems.

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Silevitch, D. M.0000-0002-6347-3513
Additional Information:© 2019 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit Received 22 July 2018; Accepted 13 August 2019; Published 05 September 2019. Data availability: The data that support the findings of this study are available from the corresponding author upon reasonable request. We thank G. Refael, Michael Buchhold, and Markus Müller for helpful discussions. The work at Caltech was supported by US Department of Energy Basic Energy Sciences Award DE-SC0014866. Author Contributions: D.M.S. and T.F.R. performed the measurements. D.M.S., C.T., G.A. and T.F.R. participated in the analysis of the data and the writing of the manuscript. The authors declare no competing interests.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0014866
Subject Keywords:Magnetic properties and materials; Phase transitions and critical phenomena
PubMed Central ID:PMC6728381
Record Number:CaltechAUTHORS:20190905-140204570
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98437
Deposited By: Tony Diaz
Deposited On:05 Sep 2019 21:30
Last Modified:16 Nov 2021 17:39

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