Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session K41: Ferroics in Two Dimensional Materials, Films, and Heterostructures
3:00 PM–5:36 PM,
Tuesday, March 7, 2023
Room: Room 319
Sponsoring
Unit:
DMP
Chair: Lingfang Lin, University of Tennessee
Abstract: K41.00001 : A type-II multiferroic in two dimensions*
3:00 PM–3:36 PM
Presenter:
Riccardo Comin
(Massachusetts Institute of Technology MIT)
Author:
Riccardo Comin
(Massachusetts Institute of Technology MIT)
In this talk, I will present our recent study and realization of type-II multiferroic order in a single atomic layer of the transition metal-based van der Waals material NiI2 [5]. The multiferroic state of NiI2 is characterized by an inversion-symmetry-breaking helimagnetic order which induces a chirality-dependent electrical polarization. Using circular dichroic Raman measurements, we directly probed the magneto-chiral ground state and its electromagnon modes originating from dynamic magnetoelectric coupling. Using birefringence and second-harmonic generation measurements, we observed a highly anisotropic electronic state simultaneously breaking three-fold rotational and inversion symmetry to support polar order. The evolution of the optical signatures as a function of temperature and layer number surprisingly revealed an ordered magnetic, polar state that persists down to the ultrathin limit of monolayer NiI2 [6].
[1] Matsukura, F., Tokura, Y. and Ohno, H., Nat. Nanotech. 10, 209 (2015).
[2] Spaldin, N. A. and Ramesh, R., Nat. Mater. 18, 203 (2019).
[3] Huang, B., et al., Nat. Nanotech. 13, 544 (2018).
[4] Jiang, S., Li, L., Wang, Z., Mak, K. F. and Shan, J., Nat. Nanotech. 13, 549 (2018).
[5] Kurumaji, T., et al., Phys. Rev. B 87, 014429 (2013).
[6] Song, Q., et al., Nature 602, 601 (2022)
*The presenting author acknolwedges support by the US Department of Energy, BES (DE-SC0019126), the National Science Foundation (DMR-1751739), and the NSF-STC Center for Integrated Quantum Materials (DMR-1231319).
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