Nonlinear Spin-Charge Dynamics in a Driven Double Quantum Dot

TL;DR

This paper investigates the complex nonlinear interactions between spin and charge in a driven double quantum dot, revealing chaotic spin behavior and spin-dependent orbital dynamics influenced by external electric and magnetic fields.

Contribution

It introduces a semiclassical model of coupled nonlinear spin-charge dynamics in a double quantum dot with spin-orbit interaction under external driving fields.

Findings

Spin-flip Rabi frequency shows unusual dependence on field amplitude.

Spin dynamics can become chaotic under certain conditions.

Orbital motion is strongly affected by spin evolution.

Abstract

The coupled nonlinear coordinate and spin dynamics of an electron in a double quantum dot with spin-orbit interaction is studied semiclassically. The system is driven by an electric field with the frequency matching the orbital or the Zeeman resonance in magnetic field. Calculated evolution of the spin state is crucially sensitive to the irregularities in the spatial motion and the geometry of the host nanostructure. The resulting spin-flip Rabi frequency has an unusual dependence on the field amplitude, demonstrating approach to the chaotic spin motion. In turn, the orbital dynamics depends strongly on the spin evolution due to the spin-dependent term in the electron velocity.