SKM 2021 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 24: Poster Session: Transport

TT 24.3: Poster

Thursday, September 30, 2021, 13:30–16:00, P

Pseudospin resonances reveal synthetic spin-orbit interaction — •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], dark states formation [2] and multilevel coherences [3]. In this context, a spin resonance without spin splitting has been first predicted for a single quantum dot spin valve [4]. We investigate a spinful double quantum dot coupled to leads in a pseudospin valve configuration. We predict in the stability diagram a rich variety of current resonances which are modulated by the system parameters [5]. In the presence of ferromagnetic leads and pseudospin anisotropy, those resonances split, turn into dips, and acquire a Fano shape, thus revealing a synthetic spin-orbit interaction induced on the double quantum dot. A set of rate equations derived for a minimal model captures those features. The model accurately matches the numerical results obtained for the full system in the framework of a generalized master equation and calculated within the next to leading order approximation.
[1] M. Braun et al., Phys. Rev. B 70, 195345 (2004)
[2] A. Donarini et al., Nature Comm. 10, 381 (2019)
[3] M. Maurer et al., Phys. Rev. Research 2, 033440 (2020)
[4] M. Hell et al., Phys. Rev. B 91, 195404 (2015)
[5] C. Rohrmeier et al., Phys. Rev. B 103, 205420 (2021)