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TT: Fachverband Tiefe Temperaturen
TT 6: Topological Superconductors
TT 6.2: Vortrag
Montag, 9. März 2026, 09:45–10:00, CHE/0091
Higher-order topological states in antiferromagnet/superconductor interface — •Ignacio Sardinero1,4, Yuriko Baba2, Rubén Seoane-Souto3, and Pablo Burset1,4 — 1Department of Theoretical Condensed Matter Physics, Universidad Autónoma de Madrid, 28049 Madrid, Spain — 2Instituto de Estructura de la Materia (IEM-CSIC), Serrano, 121, 28006 Madrid, Spain — 3Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Sor Juana Inés de la Cruz, 3, 28049 Madrid, Spain — 4Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain
Topological superconductors (TSs) are promising candidates for reliable quantum information processing. While field-free platforms often rely on ferromagnets, their stray magnetization hinders scalability. Antiferromagnets (AFMs) offer a novel approach by providing local time-reversal symmetry breaking without macroscopic magnetization. Motivated by recent experiments [1], we investigate TS in van der Waals AFM/superconductor hybrid structures. We show that trivial Andreev bound states can localize at uncompensated magnetic edges, which could explain the recent experiment [1]. Then, we propose a pathway to nontrivial topological phases driven by the interplay of AFM with Rashba or Ising spin-orbit couplings. We demonstrate that specific crystalline symmetries, particularly mirror symmetry combined spin-flip operations, stabilize second-order topological superconducting phases, characterized by a finite quadrupole moment.
[1] C. González-Sánchez et al., arXiv:2505.18578
Keywords: Superconductor; Antiferromagnet; Topological superconductivity; Andreev bound states