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MA: Fachverband Magnetismus

MA 11: Functional Antiferromagnetism

MA 11.5: Talk

Monday, March 18, 2024, 16:00–16:15, EB 202

Hexagonal MnTe with Antiferromagnetic Spin Splitting and Hidden Rashba-Dresselhaus Interaction for Antiferromagnetic Spintronics — Suman Rooj, Jayita Chakraborty, Abhijeet Kumar, and •Nirmal Ganguli — Department of Physics, Indian Institute of Science Education and Research Bhopal, Bhauri, Bhopal 462066, India

Hexagonal MnTe emerges as a critical component in designing magnetic quantum heterostructures, calling for a detailed study. After finding a suitable combination of exchange-correlation functional and corrections, our study within ab initio density functional theory uncovers an insulating state with a preferred antiferromagnetic order. We compute the exchange interaction strengths to estimate the antiferromagnetic ordering temperature via Monte Carlo calculations. Our calculations and symmetry analysis reveal a large spin splitting in the system due to the antiferromagnetic order without considering spin-orbit interaction, except in the k_x-k_y plane. Critically examining the band dispersion and spin textures obtained from our calculations and comparing them with an insightful symmetry analysis and analytical model, we confirm a combined Rashba-Dresselhaus interaction in the k_x-k_y plane, around the K point of the system. Our results and insights would help design heterostructures of MnTe for technological applications.

https://doi.org/10.1002/apxr.202300050

Keywords: Antiferromagnetism; Altermagnetism; Rashba interaction; Spintronics; Exchange interaction