Topology-Engineered Orbital Hall Effect in Two-Dimensional Ferromagnets

Nano Letters

Abstract

Recent advances in the manipulation of the orbital angular momentum (OAM) within the paradigm of orbitronics presents a promising avenue for the design of future electronic devices. In this context, the recently observed orbital Hall effect (OHE) occupies a special place. Here, focusing on both the second-order topological and quantum anomalous Hall insulators in two-dimensional ferromagnets, we demonstrate that topological phase transitions present an efficient and straightforward way to engineer the OHE, where the OAM distribution can be controlled by the nature of the band inversion. Using first-principles calculations, we identify Janus RuBrCl and three septuple layers of MnBi 2 Te 4 as experimentally feasible examples of the proposed mechanism of OHE engineering by topology. With our work, we open up new possibilities for innovative applications in topological spintronics and orbitronics.

Authors 10

1. Zhiqi Chen

   Shandong University · State Key Laboratory of Crystal Materials

   Affiliation as printed

   School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

2. Runhan Li

   Shandong University · State Key Laboratory of Crystal Materials

   Affiliation as printed

   School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

3. Yingxi Bai

   Shandong University · State Key Laboratory of Crystal Materials

   Affiliation as printed

   School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

4. Ning Mao

   Shandong University · State Key Laboratory of Crystal Materials

   Affiliation as printed

   School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

5. Mahmoud Zeer Aachen Department of Physics

   Forschungszentrum Jülich · RWTH Aachen University

   Affiliation as printed

   Department of Physics, RWTH Aachen University, 52056 Aachen, Germany

   Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany

6. Dongwook Go

   Johannes Gutenberg University Mainz

   Affiliation as printed

   Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany

7. Ying Dai corresponding

   Shandong University · State Key Laboratory of Crystal Materials

   Affiliation as printed

   School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

8. Baibiao Huang

   Shandong University · State Key Laboratory of Crystal Materials

   Affiliation as printed

   School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

9. Yuriy Mokrousov

   Johannes Gutenberg University Mainz

   Affiliation as printed

   Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany

10. Chengwang Niu corresponding

    Shandong University · State Key Laboratory of Crystal Materials

    Affiliation as printed

    School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China