2007/07/26 by A. Goker, A Goker, B. A. Friedman +3
Computer Science · Engineering · Physics and Astronomy · #Charge (physics) #Current (fluid) #Electron #Friedel oscillations #Kondo effect #Molecular Junctions and Nanostructures #Quantum and electron transport phenomena #Quantum dot #Quantum-Dot Cellular Automata #Transient (computer programming) #Transistor #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/19/37/376206
11 pages, 5 figures; to appear in J. Phys. Condens. Matter
arxiv created 2007/07/26 · openalex publication_date 2007/08/22 · arxiv updated 2015/05/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The time-dependent non-crossing approximation is used to study the transient current in a single-electron transistor attached asymmetrically to two leads following a sudden change in the energy of the dot level. We show that for asymmetric coupling, sharp features in the density of states of the leads can induce oscillations in the current through the dot. These oscillations persist to much longer timescales than the timescale for charge fluctuations. The amplitude of the oscillations increases as the temperature or source–drain bias across the dot is reduced and saturates for values below the Kondo temperature. We discuss the microscopic origin of these oscillations and comment on the possibility for their experimental detection.