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Quantum dynamics in strongly driven random dipolar magnets

Buchhold, M. and Tang, C. S. and Silevitch, D. M. and Rosenbaum, T. F. and Refael, G. (2020) Quantum dynamics in strongly driven random dipolar magnets. Physical Review B, 101 (21). Art. No. 214201. ISSN 2469-9950. doi:10.1103/PhysRevB.101.214201.

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The random dipolar magnet LiHo_xY_(1−x)F₄ enters a strongly frustrated regime for small Ho³⁺ concentrations with x < 0.05. In this regime, the magnetic moments of the Ho³⁺ ions experience small quantum corrections to the common Ising approximation of LiHo_xY_(1−x)F₄, which lead to a Z₂-symmetry breaking and small, degeneracy breaking energy shifts between different eigenstates. Here we show that destructive interference between two almost degenerate excitation pathways burns spectral holes in the magnetic susceptibility of strongly driven magnetic moments in LiHo_xY_(1−x)F₄. Such spectral holes in the susceptibility, microscopically described in terms of Fano resonances, can already occur in setups of only two or three frustrated moments, for which the driven level scheme has the paradigmatic Λ shape. For larger clusters of magnetic moments, the corresponding level schemes separate into almost isolated many-body Λ schemes, in the sense that either the transition matrix elements between them are negligibly small or the energy difference of the transitions is strongly off-resonant to the drive. This enables the observation of Fano resonances, caused by many-body quantum corrections to the common Ising approximation also in the thermodynamic limit. We discuss its dependence on the driving strength and frequency as well as the crucial role that is played by lattice dissipation.

Item Type:Article
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URLURL TypeDescription Paper
Buchhold, M.0000-0001-5194-9388
Silevitch, D. M.0000-0002-6347-3513
Additional Information:© 2020 American Physical Society. Received 24 February 2020; revised manuscript received 13 May 2020; accepted 13 May 2020; published 1 June 2020. This work was partially supported by the Department of Energy under Grant No. DE-SC0019166. M.B. acknowledges support from the Alexander von Humboldt foundation. T.F.R. acknowledges support from US Department of Energy Basic Energy Sciences Award No. DE-SC0014866. We thank Gabriel Aeppli and Markus Müller for fruitful discussions.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0019166
Alexander von Humboldt FoundationUNSPECIFIED
Department of Energy (DOE)DE-SC0014866
Issue or Number:21
Record Number:CaltechAUTHORS:20200420-111501884
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102654
Deposited By: Tony Diaz
Deposited On:20 Apr 2020 18:25
Last Modified:16 Nov 2021 18:14

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