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1er avril 2021: 1 événement

séminaire

  • Parabolic Hall Effect due to co-propagating surface modes

    Jeudi 1er avril 11:00-12:00 - Maxim Breitkreiz - Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin

    Parabolic Hall Effect due to co-propagating surface modes

    Résumé : Real-space separation of countermoving states to opposite surfaces is realized in various condensed-matter system, leading to different types of Hall effects, such as the quantum-, spin-, or the anomalous-Hall effect. A much less extensively explored type of real-space separation of countermovers is when the states of opposite surfaces move in the same direction while the countermovers are delocalized in the bulk. This can be realized in a modified Haldane model (2D) or in a magnetic Weyl semimetal (3D).
    I will show that such an exotic chirality separation is associated with a novel Hall effect, characterized by a parabolic potential profile through the conductor cross-section, such that the Hall voltage occurs not between opposite surfaces but between a single surface and the inner bulk [1]. In 2D systems the parabolic potential profile is measurable directly and in 3D systems the Hall voltage is measurable in the geometry of a hollow cylinder between the inner and the outer surfaces.
    [1] M. Breitkreiz, Phys. Rev. Research 2, 012071(R) (2020)

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