title: Quantum-classical transition and quantum activation of ratchet currents in the parameter space.
abstract: The quantum ratchet current is studied in the parameter space of the dissipative kicked rotor model coupled to a zero-temperature quantum environment. We show that vacuum fluctuations blur the generic isoperiodic stable structures found in the classical case. Such structures tend to survive when a measure of statistical dependence between the quantum and classical currents are displayed in the parameter space. In addition, we show that quantum fluctuations can be used to overcome transport barriers in the phase space. Related quantum ratchet current activation regions are spotted in the parameter space. Results are discussed based on quantum, semiclassical, and classical calculations. While the semiclassical dynamics involves vacuum fluctuations, the classical map is driven by thermal noise.
authors.affiliation: Departamento de Física, Universidade Federal do Paraná, 81531-980 Curitiba, Brazil.|Max-Planck-Institute for the Physics of Complex Systems, Nöthnitzer Strasse 38, 01187 Dresden, Germany.
authors.forename: M W
authors.initials: MW
authors.lastname: Beims
authors.affiliation: Institute for Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Schlesinger
authors.affiliation: Departamento de Física, Universidade do Estado de Santa Catarina, 89219-710 Joinville, Brazil.
authors.forename: C
authors.initials: C
authors.lastname: Manchein
authors.affiliation: Max-Planck-Institute for the Physics of Complex Systems, Nöthnitzer Strasse 38, 01187 Dresden, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Celestino
authors.affiliation: Institute for Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Pernice
authors.affiliation: Institute for Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany.
authors.forename: W T
authors.initials: WT
authors.lastname: Strunz
mesh_terms: D008962:Models, Theoretical; D011789:Quantum Theory; D013696:Temperature