title: Phase-dependent electron transport through a quantum wire on a surface.
abstract: Electron transport through a quantum wire in the presence of external periodic energy-level modulations with different on-site phases is studied within the time evolution operator method for a tight-binding Hamiltonian. It is found that in the presence of spatial symmetry of the system and no source-drain and static gate voltages the pumping current can be generated. Moreover, for a wire which is tunnel-coupled to the underlying substrate, the current flowing through an unbiased wire does not fade away but increases with the wire-surface coupling. For randomly chosen phases at every wire site two regimes of the phase-averaged current are found which are related to small and high wire density of states.
authors.affiliation: Institute of Physics, M Curie-Skłodowska University, PL-20031 Lublin, Poland. tomasz.kwapinski@umcs.lublin.pl
authors.forename: T
authors.initials: T
authors.lastname: Kwapiński
mesh_terms: D002627:Chemistry, Physical / Q000379:methods*; D004566:Electrodes; D004574:Electromagnetic Fields; D004579:Electron Transport; D004583:Electrons; D004867:Equipment Design; D015233:Models, Statistical; D011789:Quantum Theory; D013499:Surface Properties; D013696:Temperature