Chiral Phonons and Giant Magneto‐Optical Effect in CrBr3 2D Magnet. Issue 36 (24th July 2021)
- Record Type:
- Journal Article
- Title:
- Chiral Phonons and Giant Magneto‐Optical Effect in CrBr3 2D Magnet. Issue 36 (24th July 2021)
- Main Title:
- Chiral Phonons and Giant Magneto‐Optical Effect in CrBr3 2D Magnet
- Authors:
- Yin, Tingting
Ulman, Kanchan Ajit
Liu, Sheng
Granados del Águila, Andrés
Huang, Yuqing
Zhang, Lifa
Serra, Marco
Sedmidubsky, David
Sofer, Zdenek
Quek, Su Ying
Xiong, Qihua - Abstract:
- Abstract: Phonons with chirality determine the optical helicity of inelastic light scattering processes due to their nonzero angular momentum. Here it is shown that 2D magnetic CrBr3 hosts chiral phonons at the Brillouin‐zone center. These chiral phonons are linear combinations of the doubly‐degenerate Eg phonons, and the phonon eigenmodes exhibit clockwise and counterclockwise rotational vibrations corresponding to angular momenta of l = ± 1. Such Eg chiral phonons completely switch the polarization of incident circularly polarized light. On the other hand, the non‐degenerate non‐chiral Ag phonons display a giant magneto‐optical effect under an external out‐of‐plane magnetic field, rotating the plane of polarization of the scattered linearly polarized light. The corresponding degree of polarization of the scattered light changes from 91% to −68% as the magnetic field strength increases from 0 to 5 T. In contrast, the chiral Eg modes display no field dependence. The results lay a foundation for the study of phonon chirality and magneto‐optical phenomena in 2D magnetic materials, as well as their related applications, such as the phonon Hall effect, topological photonics, and Raman lasing. Abstract : Phonon chirality and magneto‐optical phenomena in CrBr3 2D magnet are reported. The superposition of doubly degenerate Eg modes results in chiral phonons with PAM of l = ±1, exhibiting isotropic linearly polarized Raman scattering. The non‐degenerate Ag modes display a giantAbstract: Phonons with chirality determine the optical helicity of inelastic light scattering processes due to their nonzero angular momentum. Here it is shown that 2D magnetic CrBr3 hosts chiral phonons at the Brillouin‐zone center. These chiral phonons are linear combinations of the doubly‐degenerate Eg phonons, and the phonon eigenmodes exhibit clockwise and counterclockwise rotational vibrations corresponding to angular momenta of l = ± 1. Such Eg chiral phonons completely switch the polarization of incident circularly polarized light. On the other hand, the non‐degenerate non‐chiral Ag phonons display a giant magneto‐optical effect under an external out‐of‐plane magnetic field, rotating the plane of polarization of the scattered linearly polarized light. The corresponding degree of polarization of the scattered light changes from 91% to −68% as the magnetic field strength increases from 0 to 5 T. In contrast, the chiral Eg modes display no field dependence. The results lay a foundation for the study of phonon chirality and magneto‐optical phenomena in 2D magnetic materials, as well as their related applications, such as the phonon Hall effect, topological photonics, and Raman lasing. Abstract : Phonon chirality and magneto‐optical phenomena in CrBr3 2D magnet are reported. The superposition of doubly degenerate Eg modes results in chiral phonons with PAM of l = ±1, exhibiting isotropic linearly polarized Raman scattering. The non‐degenerate Ag modes display a giant magneto‐optical effect under an external out‐of‐plane magnetic field, rotating the plane of polarization of the scattered linearly polarized light. … (more)
- Is Part Of:
- Advanced materials. Volume 33:Issue 36(2021)
- Journal:
- Advanced materials
- Issue:
- Volume 33:Issue 36(2021)
- Issue Display:
- Volume 33, Issue 36 (2021)
- Year:
- 2021
- Volume:
- 33
- Issue:
- 36
- Issue Sort Value:
- 2021-0033-0036-0000
- Page Start:
- n/a
- Page End:
- n/a
- Publication Date:
- 2021-07-24
- Subjects:
- chiral phonons -- pseudoangular momentum -- magneto‐optical effect -- CrBr 3 ferromagnet -- spin‐phonon coupling
Materials -- Periodicals
Chemical vapor deposition -- Periodicals
620.11 - Journal URLs:
- http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1521-4095 ↗
http://onlinelibrary.wiley.com/ ↗ - DOI:
- 10.1002/adma.202101618 ↗
- Languages:
- English
- ISSNs:
- 0935-9648
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 0696.897800
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 24666.xml