Radiation-induced current in quantum wires with side-coupled nano-rings
arXiv:cond-mat/0610709 · doi:10.1103/PhysRevB.75.035326
Abstract
Photocurrent generation is studied in a system composed of a quantum wire with side-coupled quantum rings. The current generation results from the interplay of the particular geometry of the system and the use of circularly polarized radiation. We study the energy-momentum conservation for optical transitions involving electrons moving forwards and backwards in the wire. Due to the lack of time-reversal symmetry in the radiation, the optical transitions depend on the direction of motion of the electrons, leading to a current at zero bias voltage. The photocurrent increases with the number of rings within a wide range of physical parameters. A weak non-linear dependence of the current in the number of rings, related to quantum interference effects, is also predicted. This geometry suggests a scalable method for the generation of sizeable photocurrents based on nanoscale components.
7 pages, 6 figures
References in corpus (5)
- Laser-controlled local magnetic field with semiconductor quantum rings
- Persistent and radiation-induced currents in distorted quantum rings
- Photovoltaic effect in bent quantum wires
- Spin-photovoltaic effect in quantum wires due to inter-subband transitions
- Spin Photovoltaic Effect in Quantum Wires with Rashba Interaction