Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.15: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster C
Skyrmion Stripes in Twisted Double Bilayer Graphene — •Debasmita Giri1,2, Dibya Kanti Mukherjee3,4, Herbert A. Fertig4,5,6, and Arijit Kundu2 — 1University of Regensburg, Regensburg, Germany — 2Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India — 3Laboratoire de Physique des Solides, CNRS UMR 8502, Universitè Paris-Saclay, 91405 Orsay Cedex, France — 4Department of Physics, Indiana University, Bloomington, IN 47405 — 5Quantum Science and Engineering Center, Indiana University, Bloomington, IN, 47408 — 6Instituto de Ciencia de Materiales de Madrid, (CSIC), Cantoblanco, 28049, Madrid, Spain
Two-dimensional moiré systems have recently emerged as a platform in which the interplay between topology and strong correlations of electrons play out in non-trivial ways. Among these systems, twisted double bilayer graphene (TDBG) is of particular interest as its topological properties may be tuned via both twist angle and applied perpendicular electric field. In this system, energy gaps are observed at the half-filling of particular bands, which can be associated with correlated spin-polarized states. In this work, we investigate the fate of these states as the system is doped away from this filling. We demonstrate that, for a broad range of fractional fillings, the resulting ground state is partially valley polarized and supports multiple broken symmetries, including a textured spin order indicative of skyrmions, with a novel stripe ordering that spontaneously breaks C3 symmetry.
Keywords: Twisted double bilayer graphene; Stripe order skyrmion; Hartree-Fock self consistent approximation; spin texture; doped half-filled band