Phase transitions in electron spin resonance under continuous microwave driving

Karabanov, Alexander and Rose, Dominic C. and Köckenberger, Walter and Garrahan, Juan P. and Lesanovsky, Igor (2017) Phase transitions in electron spin resonance under continuous microwave driving. Physical Review Letters, 119 . p. 150402. ISSN 1079-7114

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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.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number:
Depositing User: Lesanovsky, Igor
Date Deposited: 08 Sep 2017 11:20
Last Modified: 04 May 2020 19:11

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