The search for chiral topological superconductivity in magnetic topological insulator (TI)-FeTe heterostructures is a key frontier in condensed matter physics, with potential applications in topological quantum computing. The combination of ferromagnetism, superconductivity, and topologically nontrivial surface states brings together the key elements required for chiral Majorana physics. In this work, we examine the interplay between magnetism and superconductivity at the interfaces between FeTe and a series of TI overlayers. In superconducting MnBi2Te4/FeTe, any interfacial suppression of antiferromagnetism must affect at most a few nanometers. On the other hand, (Bi,Sb)2Te3/FeTe layers exhibit near-total suppression of antiferromagnetic ordering. Ferromagnetic Crx(Bi,Sb)2−xTe3 (CBST)/FeTe bilayers exhibit net magnetization in both CBST and FeTe layers, with evidence of interactions between superconductivity and ferromagnetism. These observations identify magnetic TI/FeTe interfaces as an exceptionally robust platform to realize chiral topological superconductivity.
@article{arxiv.2503.11502,
title = {Complex Magnetic Ordering in Candidate Topological Superconductors},
author = {Purnima P. Balakrishnan and Hemian Yi and Zi-Jie Yan and Wei Yuan and Andreas Suter and Christopher J. Jensen and Pascal Manuel and Fabio Orlandi and Takayasu Hanashima and Christy J. Kinane and Andrew J. Caruana and Brian B. Maranville and Zaher Salman and Thomas Prokscha and Cui-Zu Chang and Alexander J. Grutter},
journal= {arXiv preprint arXiv:2503.11502},
year = {2025}
}