Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 2: Altermagnets I
MA 2.1: Vortrag
Montag, 9. März 2026, 09:30–09:45, HSZ/0004
Electric Control of Spin and Valley Polarization in the XMoTeO6 Family of Two-dimensional Altermagnets — •Avijeet Ray1, Fatemeh Haddadi2, Antimo Marrazzo3, and Marco Gibertini1,4 — 1University of Modena and Reggio Emilia, Italy — 2EPFL, Switzerland — 3SISSA, Italy — 4Istituto Nanoscienze-CNR, Italy
Altermagnets are a special class of antiferromagnets with zero net magnetization but spin-split bands, even in the absence of spin-orbit-coupling. In semiconducting altermagnets, this spin-splitting can give rise to spin-valley locking, where valleys located at specific k-points have a well-defined spin. Still, symmetries connecting the spin sublattices impose an overall degeneracy between valleys of opposite spins. An external electric field can break these symmetries, enabling controllable spin (and valley) polarization. This is particularly promising in two-dimensional (2D) materials where it is easy to apply a vertical electric field in a double-gate field-effect setup, provided that 2D altermagnets with suitable crystal symmetries are found. Here, by using first-principles simulations, not only we put forward an interesting family of 2D altermagnets that display the correct symmetries, but we also show that the electric field effect is sizable in these materials and reaches the requirements needed for applications in spin-valleytronics.
Keywords: Altermagnet; 2D Materials; Magnetism; spintronics and valleytronics; First-principles