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TT: Fachverband Tiefe Temperaturen

TT 84: Focus Session: Emerging Magnetic Phenomena from Chiral Phonons II (joint session MA/TT)

Friday, March 22, 2024, 09:30–11:30, H 1058

Contemporary efforts in spintronics focus on utilizing and controlling electronic angular momentum for possible applications in data storage and processing. Only recently, an alternative has arisen in the form of angular momentum generated by circularly polarized (chiral) phonons. Chiral phonons have been shown to lead to a variety of novel magnetic phenomena, including a phonon Hall, phonon Einstein-de Haas, phonon Barnett, and phonon Zeeman effect. Phonon angular momentum can be utilized to control the magnetic state of solids and even to induce magnetization in nonmagnetic materials. These discoveries make the angular momentum of chiral phonons a promising tool for the control of magnetic materials and an emerging quantity of interest for spintronic applications. The goal of this focus session is to highlight topical research on novel magnetic phenomena arising from chiral phonons and to connect this rapidly developing field to the broader audience working in magnetism and spintronics.

Coordinators: Sebastian T. B. Goennenwein, Universität Konstanz, sebastian.goennenwein@uni-konstanz.de Ulrich Nowak, Universität Konstanz, ulrich.nowak@uni-konstanz.de

	09:30	TT 84.1	Born effective charges in insulators and metals — •Paolo Fachin, Francesco Macheda, and Francesco Mauri
	09:45	TT 84.2	Magnon-phonon coupling in Co25Fe75 thin film/crystalline substrate heterostructures — •J. Weber, M. Müller, F. Engelhardt, V. Bittencourt, T. Luschmann, M. Cherkasskii, S.T.B. Goennenwein, S.V. Kusminskiy, S. Geprägs, R. Gross, M. Althammer, and H. Huebl
	10:00	TT 84.3	Phonon inverse Faraday effect — •Natalia Shabala and R. Matthias Geilhufe
	10:15	TT 84.4	Creating and observing elliptically polarized coherent optical shear phonons in graphite — Arne Ungeheuer, Mashood T. Mir, Ahmed S. Hassanien, Lukas Nöding, Thomas Baumert, and •Arne Senftleben
	10:30	TT 84.5	The contribution has been withdrawn.
	10:45	TT 84.6	Ultrafast symmetry breaking with multicolor chiral phonons — •Omer Yaniv and Dominik Juraschek
	11:00	TT 84.7	Chiral phonons as dark matter detectors — •Carl Romao, Riccardo Catena, Nicola Spaldin, and Marek Matas
	11:15	TT 84.8	Nuclear boost to pseudomagnetic fields from quantum geometry — •Lennart Klebl, Arne Schobert, Giorgio Sangiovanni, Alexander V. Balatsky, and Tim O. Wehling