Tuning high-Q nonlinear dynamics in a disordered quantum magnet
Abstract
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.
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 http://creativecommons.org/licenses/by/4.0/. 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.Attached Files
Published - s41467-019-11985-1.pdf
Supplemental Material - 41467_2019_11985_MOESM1_ESM.pdf
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Additional details
- PMCID
- PMC6728381
- Eprint ID
- 98437
- Resolver ID
- CaltechAUTHORS:20190905-140204570
- Department of Energy (DOE)
- DE-SC0014866
- Created
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2019-09-05Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field