title: Does chaos assist localization or delocalization?
abstract: We aim at a long-standing contradiction between chaos-assisted tunneling and chaos-related localization study quantum transport of a single particle held in an amplitude-modulated and tilted optical lattice. We find some near-resonant regions crossing chaotic and regular regions in the parameter space, and demonstrate that chaos can heighten velocity of delocalization in the chaos-resonance overlapping regions, while chaos may aid localization in the other chaotic regions. The degree of localization enhances with increasing the distance between parameter points and near-resonant regions. The results could be useful for experimentally manipulating chaos-assisted transport of single particles in optical or solid-state lattices.
authors.affiliation: Department of Physics and Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha 410081, China.
authors.forename: Jintao
authors.initials: J
authors.lastname: Tan
authors.affiliation: Department of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410004, China.
authors.forename: Gengbiao
authors.initials: G
authors.lastname: Lu
authors.affiliation: Department of Physics and Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha 410081, China.
authors.forename: Yunrong
authors.initials: Y
authors.lastname: Luo
authors.affiliation: Department of Physics and Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha 410081, China.
authors.forename: Wenhua
authors.initials: W
authors.lastname: Hai