High-frequency spin eigenstates of an altermagnetic domain wall

Date

Dec 9, 2025

Time

11:00 AM - 12:00 PM

Speaker

Oksana Peschanska

Affiliation

Bogolyubov Institute, Kiyv + German-Ukrainian Research Center for Quantum Materials (GU-QuMat)

Language

en

Main Topic

Materialien

Host

Grit Rötzer

Description

We have considered the scattering of spin waves by a domain wall (DW) in an easy-axis d-wave altermagnet (e.g. CoF2, MnF2). Similar to the conventional antiferromagnet, the scattering problem is reduced to the Schroedinger equation with sech^2 potential. However, due to altermagnetism, the amplitude of the scattering potential depends on the energy of the magnons. The latter has a number of physical consequences: (i) the scattering process is different for the clockwise and counterclockwise polarized magnons; (ii) the transmission coefficient is a nonmeromorphic function of the complex-valued wave vector, so a modification of Levinson's theorem is required; (iii) new high-frequency bound (localized) eigenstates appear and propagate along DW. The number of new eigenstates, their eigenfrequencies, and eigenfunctions depend on the altermagnetic strength, wave vector q along DW, and orientation of the DW relative to the crystallographic axes. With the increase of q, the size of the localization region of the bound state can increase as well as decrease, depending on the eigenstate polarization, the sign of the altermagnetic parameter, and the DW orientation. .

Links

• Seminars at the IFW

Last modified: Dec 5, 2025, 7:38:00 AM