Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 15: Spins on surfaces at the atomic scale I
O 15.1: Invited Talk
Monday, March 9, 2026, 15:00–15:30, WILL/A317
Tuning Spin-1/2 Interactions in Graphene: From Long-Range Coupling to Altermagnetic Order — •Beatriz Viña-Bausá1, Manuel A. García-Blázquez1, Antonio T. Costa2, Joao C. G. Henriques2, Roberto Carrasco1, Eva Cortés-del Río1, Diego Expósito1, Pierre Mallet3, Jean-Yves Veuillen3, Joaquín Fernandez-Rossier2, Juan J. Palacios1, and Iván Brihuega1 — 1Dept. Física de la Materia Condensada, Universidad Autónoma de Madrid, Spain — 2International Iberian Nanotechnology Laboratory, Portugal — 3Université Grenoble Alpes, France
Here, we demonstrate that graphene, functionalized with H atoms, serves as a versatile platform for engineering and investigating long-range magnetic interactions. Through scanning tunneling microscopy, we manipulate spin-1/2 moments induced by single H atoms on graphene and quantify their coupling via spin excitations using inelastic electron tunneling spectroscopy[1]. Our measurements reveal robust ferromagnetic and antiferromagnetic exchange interactions in H pairs, extending over nanometer-scale distances. Additionally, guided by symmetry selection, we realize unconventional magnetic phases in our system, namely altermagnets and Lieb ferrimagnets[2]. Our results, supported by mean-field Hubbard and density functional theory calculations put forward hydrogenated graphene as a promising material for simulating exotic spin systems.
[1] B. Viña-Bausá, et al., arXiv:2511.06887 (2025)
[2] B. Viña-Bausá, et al., Nano Letters 25,11554-11561 (2025)
Keywords: Graphene; Altermagnetism; Atomic manipulation; scanning tunneling microscopy (STM); Spin excitations