Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 59: Magnonics III

MA 59.2: Talk

Friday, March 13, 2026, 09:45–10:00, POT/0361

Anisotropic magnon transports in van der Waals altermagnetic and ferromagnetic insulators — •Qirui Cui — Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, AlbaNova University Center, SE-10691 Stockholm, Sweden

Based on state-of-the-art first-principles calculations and model analysis [Nat. Rev. Phys. 5, 43-61 (2023)], we report the spin Seebeck effect (SSE) and spin Nernst effect (SNE) in vdW altermagnetic and ferromagnetic insulators, which are entirely independent of magnetic fields and spin-orbit coupling [Phys. Rev. B 108, L180401 (2023)]. In altermagnetic monolayers Cr2Te2O and Cr2Se2O, the breaking of combined symmetries of space inversion P, time reversal T, and translation τ, while preserving the combined symmetry of mirror M and τ, renders magnons with anisotropic spin-momentum locking, i.e., altermagnetic magnons. Interestingly, this spin-momentum locking gives rise to the SSE and SNE, with very efficient generation of longitudinal and transverse spin currents when the thermal gradient is aligned with and deviates from the main crystal axes, respectively. Moreover, anisotropic magnon dispersions are also realized in synthesized ferromagnetic monolayers CrPS4 and CrSBr, arising from C4 symmetry breaking-induced anisotropic exchange couplings [Adv. Funct. Mater. 35, 2407469 (2025)]. Consequently, without the magnetic field, the anisotropic SSE and the SNE emerge. These nontrivial magnonic transports can be further manipulated by the temperature and gate current.

Keywords: Magnonic Transport; First-principles calculations; Altermagnets; Spin Seebeck effects; Spin Nernst effects