Manipulating Spin-Lattice Coupling in Layered Magnetic Topological Insulator Heterostructure $via$ Interface Engineering
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| Autores principales: | , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2022
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| author | Maity, Sujan Dey, Dibyendu Ghosh, Anudeepa Masanta, Suvadip De, Binoy Krishna Kunwar, Hemant Singh Das, Bikash Kundu, Tanima Palit, Mainak Bera, Satyabrata Dolui, Kapildeb Watanabe, Kenji Taniguchi, Takashi Yu, Liping Taraphder, A Datta, Subhadeep |
| author_facet | Maity, Sujan Dey, Dibyendu Ghosh, Anudeepa Masanta, Suvadip De, Binoy Krishna Kunwar, Hemant Singh Das, Bikash Kundu, Tanima Palit, Mainak Bera, Satyabrata Dolui, Kapildeb Watanabe, Kenji Taniguchi, Takashi Yu, Liping Taraphder, A Datta, Subhadeep |
| contents | Induced magnetic order in a topological insulator (TI) can be realized either by depositing magnetic adatoms on the surface of a TI or engineering the interface with epitaxial thin film or stacked assembly of two-dimensional (2D) van der Waals (vdW) materials. Herein, we report the observation of spin-phonon coupling in the otherwise non-magnetic TI Bi$_\mathrm{2}$Te$_\mathrm{3}$, due to the proximity of FePS$_\mathrm{3}$ (an antiferromagnet (AFM), $T_\mathrm{N}$ $\sim$ 120 K), in a vdW heterostructure framework. Temperature-dependent Raman spectroscopic studies reveal deviation from the usual phonon anharmonicity originated from spin-lattice coupling at the Bi$_{2}$Te$_{3}$/FePS$_{3}$ interface at/below 60 K in the peak position (self-energy) and linewidth (lifetime) of the characteristic phonon modes of Bi$_{2}$Te$_{3}$ (106 cm$^{-1}$ and 138 cm$^{-1}$) in the stacked heterostructure. The Ginzburg-Landau (GL) formalism, where the respective phonon frequencies of Bi$_{2}$Te$_{3}$ couple to phonons of similar frequencies of FePS$_{3}$ in the AFM phase, has been adopted to understand the origin of the hybrid magneto-elastic modes. At the same time, the reduction of characteristic $T_\mathrm{N}$ of FePS$_3$ from 120 K in isolated flakes to 65 K in the heterostructure, possibly due to the interfacial strain, which leads to smaller Fe-S-Fe bond angles as corroborated by computational studies using density functional theory (DFT). Besides, inserting hexagonal boron nitride within Bi$_{2}$Te$_{3}$/FePS$_{3}$ stacking regains the anharmonicity in Bi$_{2}$Te$_{3}$. Controlling interfacial spin-phonon coupling in stacked heterostructure can have potential application in surface code spin logic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2212_12772 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Manipulating Spin-Lattice Coupling in Layered Magnetic Topological Insulator Heterostructure $via$ Interface Engineering Maity, Sujan Dey, Dibyendu Ghosh, Anudeepa Masanta, Suvadip De, Binoy Krishna Kunwar, Hemant Singh Das, Bikash Kundu, Tanima Palit, Mainak Bera, Satyabrata Dolui, Kapildeb Watanabe, Kenji Taniguchi, Takashi Yu, Liping Taraphder, A Datta, Subhadeep Mesoscale and Nanoscale Physics Materials Science Induced magnetic order in a topological insulator (TI) can be realized either by depositing magnetic adatoms on the surface of a TI or engineering the interface with epitaxial thin film or stacked assembly of two-dimensional (2D) van der Waals (vdW) materials. Herein, we report the observation of spin-phonon coupling in the otherwise non-magnetic TI Bi$_\mathrm{2}$Te$_\mathrm{3}$, due to the proximity of FePS$_\mathrm{3}$ (an antiferromagnet (AFM), $T_\mathrm{N}$ $\sim$ 120 K), in a vdW heterostructure framework. Temperature-dependent Raman spectroscopic studies reveal deviation from the usual phonon anharmonicity originated from spin-lattice coupling at the Bi$_{2}$Te$_{3}$/FePS$_{3}$ interface at/below 60 K in the peak position (self-energy) and linewidth (lifetime) of the characteristic phonon modes of Bi$_{2}$Te$_{3}$ (106 cm$^{-1}$ and 138 cm$^{-1}$) in the stacked heterostructure. The Ginzburg-Landau (GL) formalism, where the respective phonon frequencies of Bi$_{2}$Te$_{3}$ couple to phonons of similar frequencies of FePS$_{3}$ in the AFM phase, has been adopted to understand the origin of the hybrid magneto-elastic modes. At the same time, the reduction of characteristic $T_\mathrm{N}$ of FePS$_3$ from 120 K in isolated flakes to 65 K in the heterostructure, possibly due to the interfacial strain, which leads to smaller Fe-S-Fe bond angles as corroborated by computational studies using density functional theory (DFT). Besides, inserting hexagonal boron nitride within Bi$_{2}$Te$_{3}$/FePS$_{3}$ stacking regains the anharmonicity in Bi$_{2}$Te$_{3}$. Controlling interfacial spin-phonon coupling in stacked heterostructure can have potential application in surface code spin logic devices. |
| title | Manipulating Spin-Lattice Coupling in Layered Magnetic Topological Insulator Heterostructure $via$ Interface Engineering |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2212.12772 |