Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.21: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
Quantum Hall Ferromagnetism in Two-Dimensional Atomic Lattices — •Angelika Knothe1, Thierry Jolicoeur2, and Vladimir Fal'ko1 — 1National Graphene Institute, The University of Manchester, Manchester M13 9PL, United Kingdom — 2Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS), Université Paris-Sud, 91405 Orsay, France
Since the seminal discovery of graphene, two-dimensional (2D) atomic crystals have proven to be an exciting playground for investigating novel quantum Hall (QH) phenomena. Besides mono- and bilayer graphene [1,2] this includes 2D surface states of crystals such as the (111) surface of elemental bismuth [3] or heterostructures such as graphene on hexagonal boron nitride [4].
We theoretically investigate these novel QH systems focussing on the multiple discrete degrees of freedom the electrons may carry. Within the framework of QH ferromagnetism, i.e, treating the electronic degrees of freedom as spins and isospins, different aspects of the systems are explored by analysing the resulting spin and isospin structure. Hartree Fock theory is employed to study the influence of electronic interactions in these multicomponent spin and isospin system on the mean field level [5].
[1] A.Knothe, T. Jolicoeur, PRB 92, 165110 (2015), [2] A. Knothe, T. Jolicoeur, PRB 94, 235149 (2016), [3] B. E. Feldman, Ali Yazdani, et al., Science 354, 316-321 (2016) [4] Xi Chen, J. R. Wallbank, V. I. Fal'ko, et al., PRB 89, 075401 (2014) [5] A. Knothe, Ph.D. Thesis, University of Freiburg (2017)