Influence of the spatial fluctuations of the Rashba field and magnetization on the electron and spin transport in 2D systems

ORAL

Abstract

In a general case, spin-orbit coupling contains regular (spatially uniform, periodic) and a random component. Local imperfections, such as a random distribution of donors or impurities, may lead to local modifications of the spin-orbit coupling. Similarly, magnetization in the system may reveal spatial fluctuations as well. Such fluctuations modify transport properties of the system and induce a variety of observable effects [Physica E 42, 2157 (2010); Nat. Phys.12, 920(2016)].
We will present the theoretical description of the selected transport characteristics (electric and spin conductivity and anomalous Hall effect) induced or modified due to the presence of random Rashba field or magnetization fluctuations in 2D systems such as semiconductor heterostructures or topological insulators. We will show an important role of the transport relaxation time for charge and spin currents, that leads to a nontrivial temperature dependence of the conductivity [S.Kudla et al., PRB 97, 245307(2018)]. We will also consider the influence of magnetization fluctuations on the anomalous Hall effect in topological insulators.

*This work has been supported by the National Science Center in Poland (project No. DEC-2017/27/B/ST3/02881) and by German Research Foundation through SFB 726 and SFB TRR 227.

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Presenters

  • Anna Dyrdal

    • Institut für Physik, Martin-Luther Universität Halle-Wittenberg, D-06099 Halle, Germany
    • Institut fur Physik, Martin-Luther Universitat Halle-Wittenberg, D-06099 Halle, Germany

Authors

  • Anna Dyrdal

    • Institut für Physik, Martin-Luther Universität Halle-Wittenberg, D-06099 Halle, Germany
    • Institut fur Physik, Martin-Luther Universitat Halle-Wittenberg, D-06099 Halle, Germany

  • Sylwia Kudla

    • Department of Physics and Medical Engineering, Rzeszow University of Technology, Al. Powstancow Warszawy 6, 35-959 Rzeszow, Poland

  • Vitalii Dugaev

    • Department of Physics and Medical Engineering, Rzeszow University of Technology, Al. Powstancow Warszawy 6, 35-959 Rzeszow, Poland
    • Department of Physics and Medical Engineering, Rzeszow University of Technology

  • Evgeny Sherman

    • Department of Physical Chemistry, Universidad del País Vasco UPV-EHU, 48080, Bilbao, Spain

  • Jozef Barnas

    • Faculty of Physics, Adam Mickiewicz University in Poznan, ul. Umultowska 85, 61-614 Poznan, Poland

  • Jamal Berakdar

    • Institut für Physik, Martin-Luther Universität Halle-Wittenberg, D-06099 Halle, Germany
    • Institut fur Physik, Martin-Luther Universitat Halle-Wittenberg, D-06099 Halle, Germany
    • Martin-Luther University Halle-Wittenberg