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Mesoscopic mean-field theory for spin-boson chains in quantum optical systems

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Nevado Serrano, Pedro and Porras Torres, Diego (2013) Mesoscopic mean-field theory for spin-boson chains in quantum optical systems. European physical journal-special topics, 217 (1). pp. 29-41. ISSN 1951-6355

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Official URL: http://doi.org/10.1140/epjst/e2013-01751-1


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Abstract

We present a theoretical description of a system of many spins strongly coupled to a bosonic chain. We rely on the use of a spin-wave theory describing the Gaussian fluctuations around the mean-field solution, and focus on spin-boson chains arising as a generalization of the Dicke Hamiltonian. Our model is motivated by experimental setups such as trapped ions, or atoms/qubits coupled to cavity arrays. This situation corresponds to the cooperative (E circle times beta) Jahn-Teller distortion studied in solid-state physics. However, the ability to tune the parameters of the model in quantum optical setups opens up a variety of novel intriguing situations. The main focus of this paper is to review the spin-wave theoretical description of this problem as well as to test the validity of mean-field theory. Our main result is that deviations from mean-field effects are determined by the interplay between magnetic order and mesoscopic cooperativity effects, being the latter strongly size-dependent.


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Additional Information:

© Springer Heidelberg
We acknowledge QUITEMAD S2009-ESP-1594, FIS2009-10061, CAM-UCM/910758 and RyC Contract Y200200074, and COST action ”IOTA”.

Uncontrolled Keywords:Phase-rransition; Trapped Ions; Simulation
Subjects:Sciences > Physics
ID Code:47360
Deposited On:08 May 2018 11:06
Last Modified:09 May 2018 09:00

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