Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 15: Topology: Majorana Physics
TT 15.8: Talk
Monday, March 9, 2026, 17:00–17:15, HSZ/0105
Proximity-induced superconducting states in high Chern number quantum anomalous Hall heterostructures — Alejandro S. Gómez1,2, Rafael A. Molina3, Pablo Burset1,2,4, and •Yuriko Baba2,3 — 1Universidad Autónoma de Madrid, Madrid, Spain — 2IFIMAC-UAM, Madrid, Spain — 3Instituto de Estructura de la Materia IEM-CSIC, Madrid, Spain — 4Instituto Nicolás Cabrera-UAM, Madrid, Spain
Multilayer stackings of magnetically doped and undoped topological insulators can host multiple chiral channels forming a high Chern number quantum anomalous Hall (QAH) state [1]. This topological state does not require an external magnetic field. Therefore, a single channel QAH proximized by an s-wave superconductor has been proposed as a promising platform to achieve topological superconductivity and chiral Majorana modes [2,3]. In this work, we generalize these proposals to the case of heterostructures with multiple chiral states proximitized by a superconductor. We theoretically study the topological phases of the bulk system and the appearance of zero-energy states due to the bulk-boundary correspondence in the band inversion regime. Finally, we discuss the nature and topological protection of the zero-energy states against disorder and finite-size confinement effects.
[1] Y.F. Zhao et al. Nature 588 (2020) 419
[2] X.L. Qi, T.L. Hughes, S.C. Zhang Phys. Rev. B 82 (2010) 184516
[3] A. Udayet al., Nat. Phys. 20 (2024) 1589
Keywords: Quantum Anomalous Hall; High Chern number; Topological Superconductivity; Majorana physics; Anderson disorder