Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 22: Quantum Dots, Quantum Wires, Point Contacts

TT 22.12: Talk

Tuesday, March 17, 2020, 12:30–12:45, HSZ 201

Pseudospin resonances in a double quantum dot — •Christoph Rohrmeier and Andrea Donarini — Institute of Theoretical Physics University of Regensburg, Regensburg, Germany

The interplay between interference and interaction produces several effects in degenerate quantum systems, including spin torques [1], all electrical spin control [2] and dark states formation [3]. In this context, a spin resonance without spin splitting has been first predicted for a single quantum dot spin valve [4]. We consider a spin-full double quantum dot with the orbital degree of freedom described by a pseudospin and predict a rich variety of pseudospin resonances. The latter are modulated with the system parameters, can be split up and even turned into a Fano-like resonance in the presence of ferromagnetic leads. This interplay of spin and pseudospin is understood in terms of spin dependent pseudo-exchange fields. The numerical results are obtained in the framework of a generalized master equation, calculated up to next to leading order in the tunnelling coupling.

[1] M. Braun et al., Phys. Rev. B 70, 195345 (2004)

[2] A. Donarini et al., Nano Lett. 9, 2897 (2009)

[3] A. Donarini et al., Nature Comm. 10, 381 (2019)

[4] M. Hell et al., Phys. Rev. B 91, 195404 (2015)