Pulse-pumped double quantum dot with spin-orbit coupling

¹  Department of Physics, University of Nizhny Novgorod - 23 Gagarin Avenue, 603950 Nizhny Novgorod, Russian Federation
²  Department of Physical Chemistry, Universidad del País Vasco - 48080 Bilbao, Spain, EU
³  Basque Foundation for Science IKERBASQUE - 48011, Bilbao, Spain, EU

Corresponding author: evgeny_sherman@ehu.es

Received: 5 November 2009
Accepted: 15 April 2010

Abstract

We consider the full driven quantum dynamics of a qubit realized as spin of electron in a one-dimensional double quantum dot with spin-orbit coupling. The driving perturbation is taken in the form of a single half-period pulse of electric field. Spin-orbit coupling leads to a nontrivial evolution in the spin and charge densities making the dynamics in both quantities irregular. As a result, the charge density distribution becomes strongly spin-dependent. The transition from the field-induced tunneling to the strong-coupling regime is clearly seen in the charge and spin channels. These results can be important for the understanding of the techniques for the spin manipulation in nanostructures.