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Dissipative effects on quantum glassy systems

Leticia F. Cugliandolo·Daniel Grempel·Gustavo Lozano·Homero Lozza·Constantino da Silva Santos
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Abstract

We discuss the behavior of a quantum glassy system coupled to a bath of quantum oscillators. We show that the system localizes in the absence of interactions when coupled to a subOhmic bath. When interactions are switched on localization disappears and the system undergoes a phase transition towards a glassy phase. We show that the position of the critical line separating the disordered and the ordered phases strongly depends on the coupling to the bath. For a given type of bath, the ordered glassy phase is favored by a stronger coupling. Ohmic, subOhmic and superOhmic baths lead to different transition lines. We draw our conclusions from the analysis of the partition function using the replicated imaginary-time formalism and from the study of the real-time dynamics of the coupled system using the Schwinger-Keldysh closed time-path formalism.

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Leticia F. Cugliandolo, Daniel Grempel, Gustavo Lozano, Homero Lozza, Constantino da Silva Santos. 2001-10-23. Dissipative effects on quantum glassy systems. https://doi.org/10.1103/physrevb.66.014444

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