Dissipative effects on quantum glassy systems
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 sub-Ohmic bath. When interactions are switched on localization disappears and the system undergoes a phase transition toward...
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2002
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v66_n1_p144441_Cugliandolo http://hdl.handle.net/20.500.12110/paper_01631829_v66_n1_p144441_Cugliandolo |
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paper:paper_01631829_v66_n1_p144441_Cugliandolo2023-06-08T15:13:59Z Dissipative effects on quantum glassy systems Lozza, Homero Fernando glass article dynamics electric resistance electricity oscillation phase transition quantum mechanics 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 sub-Ohmic 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 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, sub-Ohmic, and super-Ohmic baths lead to different transition lines. We draw our conclusions from 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. Fil:Lozza, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v66_n1_p144441_Cugliandolo http://hdl.handle.net/20.500.12110/paper_01631829_v66_n1_p144441_Cugliandolo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
glass article dynamics electric resistance electricity oscillation phase transition quantum mechanics |
| spellingShingle |
glass article dynamics electric resistance electricity oscillation phase transition quantum mechanics Lozza, Homero Fernando Dissipative effects on quantum glassy systems |
| topic_facet |
glass article dynamics electric resistance electricity oscillation phase transition quantum mechanics |
| description |
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 sub-Ohmic 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 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, sub-Ohmic, and super-Ohmic baths lead to different transition lines. We draw our conclusions from 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. |
| author |
Lozza, Homero Fernando |
| author_facet |
Lozza, Homero Fernando |
| author_sort |
Lozza, Homero Fernando |
| title |
Dissipative effects on quantum glassy systems |
| title_short |
Dissipative effects on quantum glassy systems |
| title_full |
Dissipative effects on quantum glassy systems |
| title_fullStr |
Dissipative effects on quantum glassy systems |
| title_full_unstemmed |
Dissipative effects on quantum glassy systems |
| title_sort |
dissipative effects on quantum glassy systems |
| publishDate |
2002 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v66_n1_p144441_Cugliandolo http://hdl.handle.net/20.500.12110/paper_01631829_v66_n1_p144441_Cugliandolo |
| work_keys_str_mv |
AT lozzahomerofernando dissipativeeffectsonquantumglassysystems |
| _version_ |
1768544773014028288 |