title: Barrier-induced chaos in a kicked rotor: Classical subdiffusion and quantum localization.
abstract: The relation between classically chaotic dynamics and quantum localization is studied in a system that violates the assumptions of the Kolmogorov-Arnold-Moser (KAM) theorem, namely, the kicked rotor in a discontinuous potential barrier. We show that the discontinuous barrier induces chaos and more than two distinct subdiffusive energy growth regimes, the latter being an unusual feature for Hamiltonian chaos. We show that the dynamical localization in the quantized version of this system carries the imprint of non-KAM classical dynamics through the dependence of quantum break time on subdiffusion exponents. We briefly comment on the experimental feasibility of this system.
authors.affiliation: Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pune 411 008, India.
authors.forename: Sanku
authors.initials: S
authors.lastname: Paul
authors.affiliation: Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Codigo Postal 62210, Cuernavaca, Mexico.
authors.forename: Harinder
authors.initials: H
authors.lastname: Pal
authors.affiliation: Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pune 411 008, India.
authors.forename: M S
authors.initials: MS
authors.lastname: Santhanam