著者 |
Felix, G., G., Hernandez
Andrey, Baydin
Swati, Chaudhary
en |
Swati, Chaudhary
Department of Physics, The University of Texas at Austin
Department of Physics, Northeastern University
Department of Physics, Massachusetts Institute of Technology
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Fuyang Tay
ORCID
0000-0003-0264-5104
en |
Fuyang Tay
Department of Electrical and Computer Engineering, Rice University
Applied Physics Graduate Program, Smalley-Curl Institute, Rice University
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Ikufumi, Katayama
en |
Ikufumi, Katayama
Department of Physics, Graduate School of Engineering Science, Yokohama National University
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Jun, Takeda
en |
Jun, Takeda
Department of Physics, Graduate School of Engineering Science, Yokohama National University
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Hiroyuki, Nojiri
Anderson, K., Okazaki
Paulo, H., O., Rappl
Eduardo, Abramof
Martin Rodriguez-Vega
Gregory, A., Fiete
Junichiro, Kono
ORCID
0000-0002-4195-0577
en |
Junichiro, Kono
Department of Electrical and Computer Engineering, Rice University
Smalley-Curl Institute, Rice University
Department of Physics and Astronomy, Rice University
Department of Materials Science and NanoEngineering, Rice University
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内容記述 |
The recently demonstrated chiral modes of lattice motion carry angular momentum and therefore directly couple to magnetic fields. Notably, their magnetic moments are predicted to be strongly influenced by electronic contributions. Here, we have studied the magnetic response of transverse optical phonons in a set of Pb1−xSnxTe films, which is a topological crystalline insulator for x > 0.32 and has a ferroelectric transition at an x-dependent critical temperature. Polarization-dependent terahertz magnetospectroscopy measurements revealed Zeeman splittings and diamagnetic shifts, demonstrating a large phonon magnetic moment. Films in the topological phase exhibited phonon magnetic moment values that were larger than those in the topologically trivial samples by two orders of magnitude. Furthermore, the sign of the effective phonon g-factor was opposite in the two phases, a signature of the topological transition according to our model. These results strongly indicate the existence of interplay between the magnetic properties of chiral phonons and the topology of the electronic band structure. |