Exfoliation and Optical Properties of S=1 Triangular Lattice Antiferromagnet NiGa$_2$S$_4$
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866917520882008064 |
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| author | Victorin, Jazzmin Razpopov, Aleksandar Higo, Tomoya Dziobek-Garrett, Reynolds Kempa, Thomas J. Nakatsuji, Satoru Valentí, Roser Drichko, Natalia |
| author_facet | Victorin, Jazzmin Razpopov, Aleksandar Higo, Tomoya Dziobek-Garrett, Reynolds Kempa, Thomas J. Nakatsuji, Satoru Valentí, Roser Drichko, Natalia |
| contents | Two-dimensional (2D) van der Waals (vdW) materials have been an exciting area of research ever since scientists first isolated a single layer of graphene. Single layer magnetic materials can provide a pathway for vdW heterostructures with magnetic properties. While most of the magnetic vdW materials exhibit ordering transitions in the bulk, here we report a successful exfoliation of a triangular lattice S=1 antiferromagnet NiGa$_2$S$_4$, which already demonstrates exotic magnetism in the bulk material. We establish the number of layers of the material by atomic force microscopy (AFM) and detail a careful characterization using Raman and optical spectroscopy to demonstrate how the optical, electronic, and structural properties of NiGa$_2$S$_4$ change as a function of sample thickness. Optical measurements and electronic structure calculations of bulk versus monolayer NiGa$_2$S$_4$ confirm the material to be a Mott insulator with an electronic gap of about 1.5 eV, which slightly increases for layers below 10 L. We conclude with a theoretical analysis of the possibility of doping monolayer NiGa$_2$S$_4$ by proximity to a metal. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_02853 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exfoliation and Optical Properties of S=1 Triangular Lattice Antiferromagnet NiGa$_2$S$_4$ Victorin, Jazzmin Razpopov, Aleksandar Higo, Tomoya Dziobek-Garrett, Reynolds Kempa, Thomas J. Nakatsuji, Satoru Valentí, Roser Drichko, Natalia Materials Science Mesoscale and Nanoscale Physics Two-dimensional (2D) van der Waals (vdW) materials have been an exciting area of research ever since scientists first isolated a single layer of graphene. Single layer magnetic materials can provide a pathway for vdW heterostructures with magnetic properties. While most of the magnetic vdW materials exhibit ordering transitions in the bulk, here we report a successful exfoliation of a triangular lattice S=1 antiferromagnet NiGa$_2$S$_4$, which already demonstrates exotic magnetism in the bulk material. We establish the number of layers of the material by atomic force microscopy (AFM) and detail a careful characterization using Raman and optical spectroscopy to demonstrate how the optical, electronic, and structural properties of NiGa$_2$S$_4$ change as a function of sample thickness. Optical measurements and electronic structure calculations of bulk versus monolayer NiGa$_2$S$_4$ confirm the material to be a Mott insulator with an electronic gap of about 1.5 eV, which slightly increases for layers below 10 L. We conclude with a theoretical analysis of the possibility of doping monolayer NiGa$_2$S$_4$ by proximity to a metal. |
| title | Exfoliation and Optical Properties of S=1 Triangular Lattice Antiferromagnet NiGa$_2$S$_4$ |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2406.02853 |