Nonequilibrium dynamics of quantum spin glass in an AC magnetic field |
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| Authors: | G Busiello R V Saburova V G Sushkova G P Chugunova |
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| Institution: | (1) Baronissi-Salerno and INFM-Unitá di Salerno, Salerno, Itali;(2) Dipartimento di Fisica “E.R. Caianiello,”, Universitá di Salerno, 84081, Itali;(3) Kazan State Power University, Kazan, 620066, Tatarstan, Russia;(4) Kazan State University of Technology, Kazan, 420015, Tatarstan, Russia |
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| Abstract: | The ageing effect is studied analytically in a disordered quantum system interacting with its surroundings and subjected to an external ac magnetic field. Energy dissipation is due to the interaction of the system with a set of independent harmonic oscillators, imitating a quantum thermal bath. Dynamic equations for the autocorrelation function and linear-response function are derived using the method of closed-path integrals. The effect of an external field is studied on the correlation function and response in the spin-glass and paramagnetic phases. Both functions are found to depend on the spin interaction strength. |
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