Multiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers

Abstract The van der Waals Kitaev magnet α-RuCl3 has recently garnered considerable attention due to its possible realization of topological spin liquids. Combining Raman spectroscopy with numerical calculations, we report here the thickness dependence of electronic structure and ensuing low-energy...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Je-Ho Lee, Youngsu Choi, Seung-Hwan Do, Beom Hyun Kim, Maeng-Je Seong, Kwang-Yong Choi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/0ca7cb15a247427cbb4dfba3c1b01a56
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:0ca7cb15a247427cbb4dfba3c1b01a56
record_format	dspace
spelling	oai:doaj.org-article:0ca7cb15a247427cbb4dfba3c1b01a562021-12-02T16:51:31ZMultiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers10.1038/s41535-021-00340-72397-4648https://doaj.org/article/0ca7cb15a247427cbb4dfba3c1b01a562021-05-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00340-7https://doaj.org/toc/2397-4648Abstract The van der Waals Kitaev magnet α-RuCl3 has recently garnered considerable attention due to its possible realization of topological spin liquids. Combining Raman spectroscopy with numerical calculations, we report here the thickness dependence of electronic structure and ensuing low-energy excitations for exfoliated α-RuCl3. We observe two pronounced peaks at A1 = 249 meV and A2 = 454 meV, which are assigned to single and double spin-orbit (SO) excitons, respectively. Our numerical calculations support this interpretation by reproducing their spectral energy and shape with the electronic parameters: SO coupling λ = 140 meV, Hund’s coupling J H = 350 meV, and on-site Coulomb interaction U = 2.35 eV. The multiple SO excitons persist down to a single layer, whereas their peaks shift slightly to lower energy. For frequencies below 350 cm−1, both a magnetic continuum and phonons show noticeable thickness dependence. These results demonstrate that a SO entangled j eff = 1/2 picture remains valid in a monolayer limit despite the presence of lattice distortions.Je-Ho LeeYoungsu ChoiSeung-Hwan DoBeom Hyun KimMaeng-Je SeongKwang-Yong ChoiNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Je-Ho Lee Youngsu Choi Seung-Hwan Do Beom Hyun Kim Maeng-Je Seong Kwang-Yong Choi Multiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers
description	Abstract The van der Waals Kitaev magnet α-RuCl3 has recently garnered considerable attention due to its possible realization of topological spin liquids. Combining Raman spectroscopy with numerical calculations, we report here the thickness dependence of electronic structure and ensuing low-energy excitations for exfoliated α-RuCl3. We observe two pronounced peaks at A1 = 249 meV and A2 = 454 meV, which are assigned to single and double spin-orbit (SO) excitons, respectively. Our numerical calculations support this interpretation by reproducing their spectral energy and shape with the electronic parameters: SO coupling λ = 140 meV, Hund’s coupling J H = 350 meV, and on-site Coulomb interaction U = 2.35 eV. The multiple SO excitons persist down to a single layer, whereas their peaks shift slightly to lower energy. For frequencies below 350 cm−1, both a magnetic continuum and phonons show noticeable thickness dependence. These results demonstrate that a SO entangled j eff = 1/2 picture remains valid in a monolayer limit despite the presence of lattice distortions.
format	article
author	Je-Ho Lee Youngsu Choi Seung-Hwan Do Beom Hyun Kim Maeng-Je Seong Kwang-Yong Choi
author_facet	Je-Ho Lee Youngsu Choi Seung-Hwan Do Beom Hyun Kim Maeng-Je Seong Kwang-Yong Choi
author_sort	Je-Ho Lee
title	Multiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers
title_short	Multiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers
title_full	Multiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers
title_fullStr	Multiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers
title_full_unstemmed	Multiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers
title_sort	multiple spin-orbit excitons in α-rucl3 from bulk to atomically thin layers
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0ca7cb15a247427cbb4dfba3c1b01a56
work_keys_str_mv	AT jeholee multiplespinorbitexcitonsinarucl3frombulktoatomicallythinlayers AT youngsuchoi multiplespinorbitexcitonsinarucl3frombulktoatomicallythinlayers AT seunghwando multiplespinorbitexcitonsinarucl3frombulktoatomicallythinlayers AT beomhyunkim multiplespinorbitexcitonsinarucl3frombulktoatomicallythinlayers AT maengjeseong multiplespinorbitexcitonsinarucl3frombulktoatomicallythinlayers AT kwangyongchoi multiplespinorbitexcitonsinarucl3frombulktoatomicallythinlayers
_version_	1718382901201993728

Multiple spin-orbit excitons in α-RuCl3 from bulk to atomically thin layers

Ejemplares similares