Observation of interplay between phonon chirality and electronic band topology

Author:

Hernandez Felix G. G.1ORCID,Baydin Andrey23ORCID,Chaudhary Swati456,Tay Fuyang27ORCID,Katayama Ikufumi8,Takeda Jun8,Nojiri Hiroyuki9ORCID,Okazaki Anderson K.10ORCID,Rappl Paulo H. O.10ORCID,Abramof Eduardo10ORCID,Rodriguez-Vega Martin45ORCID,Fiete Gregory A.56ORCID,Kono Junichiro231112ORCID

Affiliation:

1. Instituto de Física, Universidade de São Paulo, São Paulo, SP 05508-090, Brazil.

2. Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA.

3. Smalley-Curl Institute, Rice University, Houston, TX 77005, USA.

4. Department of Physics, The University of Texas at Austin, Austin, TX 78712, USA.

5. Department of Physics, Northeastern University, Boston, MA 02115, USA.

6. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

7. Applied Physics Graduate Program, Smalley-Curl Institute, Rice University, Houston, TX 77005, USA.

8. Department of Physics, Graduate School of Engineering Science, Yokohama National University, Yokohama 240-8501, Japan.

9. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.

10. Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP 12201-970, Brazil.

11. Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA.

12. Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA.

Abstract

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 Pb 1− x Sn x Te 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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Ultrafast entropy production in pump-probe experiments;Nature Communications;2024-01-02

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