Net current generation in a 1D quantum ring at zero magnetic field

Gylfadottir, Sigridur Sif; Nita, Marian; Gudmundsson, Vidar; Manolescu, Andrei

Net current generation in a 1D quantum ring at zero magnetic field

Authors

Gylfadottir, Sigridur Sif

Nita, Marian

Gudmundsson, Vidar

Manolescu, Andrei

Description

We study a non-adiabatic excitation of an electron system in a 1D quantum ring radiated by a short THz pulse. The response of two models, a continuous and discrete, is explored. By introducing a spatial asymmetry in the external perturbation a net current can be generated in the ring at a zero magnetic field. Effect of impurities and ratchets are investigated in combination with symmetric and asymmetric external excitation.
LaTeX 4 pages with 6 embedded postscript figures