Single spin Landau-Zener-St\"uckelberg-Majorana interferometry of Zeeman-split states with strong spin-orbit interaction in a double quantum dot

TL;DR

This paper theoretically investigates the complex spin dynamics in a driven double quantum dot with strong spin-orbit interaction, revealing conditions for efficient spin control via Landau-Zener-Stückelberg-Majorana interference and EDSR harmonics.

Contribution

It introduces a Floquet-based method to analyze spin evolution in a Zeeman-split four-level system, identifying special parameter points for optimized spin control in quantum dots.

Findings

Identification of triple-crossing resonance conditions

Revealing EDSR harmonics in spin-dependent tunneling maps

Potential applications for qubit spin control and readout

Abstract

Single spin state evolution induced by the Landau-Zener-St\"uckelberg-Majorana (LZSM) interference in a Zeeman-spit four level system in a periodically driven double quantum dot is studied theoretically by the Floquet stroboscopic method. An interplay between spin-conserving and spin-flip tunneling processes with the Electric Dipole Spin Resonance (EDSR) that is induced in an individual dot and enhanced by the LZSM multiple level crossings with the neighboring quantum dot is investigated as a function of the microwave (MW) frequency, driving amplitude, interdot detuning, and magnetic field. A number of special points in the parameter space are identified, out of which where all the three features are merged. Under this triple-crossing resonance condition the interdot tunneling is combined with a fast spin evolution in each dot at the EDSR frequency. Harmonics of the EDSR are revealed in the spin-dependent tunneling maps versus variable magnetic field and MW frequency. The results are applicable for both electron and hole systems with strong spin-orbit interaction and may be useful for developing new time-efficient schemes of the spin control and readout in qubit devices.