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Phase transitions in electron spin resonance under continuous microwave driving

Karabanov, Alexander; Rose, Dominic C.; Köckenberger, Walter; Garrahan, Juan P.; Lesanovsky, Igor

Authors

Alexander Karabanov

Dominic C. Rose



Abstract

We study an ensemble of strongly coupled electrons under continuous microwave irradiation interacting with a dissipative environment, a problem of relevance to the creation of highly polarized non-equilibrium states
in nuclear magnetic resonance. We analyze the stationary states of the dynamics, described within a Lindblad master equation framework, at the mean-field approximation level. This approach allows us to identify steady state phase transitions between phases of high and low polarization controlled by the distribution of disordered electronic interactions. We compare the mean-field predictions to numerically exact simulations of small systems and find good agreement. Our study highlights the possibility of observing collective phenomena, such as metastable states, phase transitions and critical behaviour in appropriately designed paramagnetic systems. These phenomena occur in a low-temperature regime which is not theoretically tractable by conventional methods, e.g., the spin-temperature approach.

Citation

Karabanov, A., Rose, D. C., Köckenberger, W., Garrahan, J. P., & Lesanovsky, I. (in press). Phase transitions in electron spin resonance under continuous microwave driving. Physical Review Letters, 119, https://doi.org/10.1103/PhysRevLett.119.150402

Journal Article Type Article
Acceptance Date Sep 6, 2017
Online Publication Date Oct 11, 2017
Deposit Date Sep 8, 2017
Publicly Available Date Oct 11, 2017
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 119
DOI https://doi.org/10.1103/PhysRevLett.119.150402
Public URL http://eprints.nottingham.ac.uk/id/eprint/45579
Publisher URL https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.150402
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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