Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 51: Spin Transport and Orbitronics, Spin-Hall Effects II (joint session MA/TT)

MA 51.4: Talk

Thursday, March 12, 2026, 15:45–16:00, POT/0361

Orbital contribution to g-tensor from first-principles modern theory — •Garima Ahuja¹, Mirco Sastges^2,3, Dongwook Go⁴, Shobhana Narasimhan¹, Yuriy Mokrousov^2,3, and Stefan Blügel^2,5 — ¹Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India — ²Peter Grünberg Institut, Forschungszentrum Jülich and JARA, Jülich, Germany — ³Institute of Physics, Johannes Gutenberg University Mainz, Mainz, Germany — ⁴Department of Physics, Korea University, Seoul, South Korea — ⁵Institute for Theoretical Physics, RWTH Aachen University, Aachen, Germany

The electronic g-factor, which measures how angular momentum couples to magnetic fields, is a key descriptor of magnetic behavior in solids. In crystalline materials, the orbital contribution to the g-factor can significantly modify its value. In this talk, we present a first-principles framework for computing g-factors, based on multiband perturbation theory with the DFT-Wannier approach, to reveal microscopic origins of the orbital contribution, highlighting the roles of local and non-local orbital currents. We resolve both orbital and spin responses, determine the full g-tensor, and show how interband couplings and band geometry shape the g-tensor across the Brillouin zone. g-tensor plays a key role in quantum technologies, where qubit coherence and control depend on accurate knowledge of magnetic response. We present our findings for some interesting bulk and 2D systems, offering a predictive route for engineering magnetic responses in materials relevant to quantum computing, spin-orbitronics, and spectroscopy.

Keywords: g-tensor; magnetic responses; orbital effects; DFT; Wannier method