Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 63: Focus Session: Emerging Magnetic Phenomena from Chiral Phonons I (joint session MA/TT)
TT 63.4: Hauptvortrag
Donnerstag, 21. März 2024, 11:15–11:45, H 1058
Orbital magnetic moment of phonons in diamagnetic and paraelectric perovskites — Filip Kadlek1, Christelle Kadlek1, •Martina Basini2,3, Sergey Kovalev4, Jan-Christoph Deinert4, Stefano Bonetti1,5, and Stanislav Kamba1 — 1Institute of Physics of the Czech Academy of Sciences, Praha, Czech Republic — 2Department of Physics, Stockholm University, Stockholm, Sweden — 3Deparment of Materials and Nanophysics, KTH Royal Institute of Technology, Stockholm Sweden — 4Helmholz Zentrum Dresden-Rossendorf, Germany — 5Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Venice, Italy
In the present work, we demonstrate transient magnetism in KTaO3 induced by chiral phonons. In particular, the infrared-active soft phonon was circularly excited by means of intense quasi-monochromatic THz pulses produced by the TELBE facility and the magnetic moment was probed by magneto-optical Faraday effect. The evidence will be compared with our previous results on SrTiO3. We anticipate that, contrary to SrTiO3, KTaO3 does not undergo any structural phase transition at low temperature so that we could efficiently excite the soft phonon below 100K, where the phonon effective charge is larger and a higher value of the induced orbital magnetic moments per unit cell is expected.
Keywords: Chiral phonons; Dynamical muliferroicity; Phonon dynamics; Phonon magnetic moment; Ulrafast Barnett Effect