Phonon modes and Raman signatures of MnBi_{2n}Te_{3n+1}(n=1,2,3,4) magnetic topological heterostructures
An intrinsic antiferromagnetic topological insulator MnBi_{2}Te_{4} arises when intercalating a Mn-Te bilayer chain in a topological insulator, Bi_{2}Te_{3}. We present observations on the inter- and intralayer phonon modes of the generalized MnBi_{2n}Te_{3n+1}(n=1,2,3,4) family using cryogenic low-...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2022-02-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.4.013108 |
| _version_ | 1797210767258288128 |
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| author | Yujin Cho Jin Ho Kang Liangbo Liang Madeline Taylor Xiangru Kong Subhajit Ghosh Fariborz Kargar Chaowei Hu Alexander A. Balandin Alexander A. Puretzky Ni Ni Chee Wei Wong |
| author_facet | Yujin Cho Jin Ho Kang Liangbo Liang Madeline Taylor Xiangru Kong Subhajit Ghosh Fariborz Kargar Chaowei Hu Alexander A. Balandin Alexander A. Puretzky Ni Ni Chee Wei Wong |
| author_sort | Yujin Cho |
| collection | DOAJ |
| description | An intrinsic antiferromagnetic topological insulator MnBi_{2}Te_{4} arises when intercalating a Mn-Te bilayer chain in a topological insulator, Bi_{2}Te_{3}. We present observations on the inter- and intralayer phonon modes of the generalized MnBi_{2n}Te_{3n+1}(n=1,2,3,4) family using cryogenic low-frequency Raman spectroscopy with various polarization configurations. Two peaks at 66 and 112cm^{–1} show abnormal perturbation in Raman linewidths below magnetic transition temperature due to spin-phonon coupling. In MnBi_{4}Te_{7}, Bi_{2}Te_{3} layers induce Davydov splitting of the A_{1g} mode around 137cm^{–1} at 5 K. The out-of-plane interlayer force constant estimated using the linear chain model was (3.98±0.14)×10^{19}N/m^{3}, three times weaker than that of Bi_{2}Te_{3}. Adding more Bi_{2}Te_{3} layers, such as MnBi_{6}Te_{10} and MnBi_{8}Te_{13}, makes Bi_{2}Te_{3} properties more dominant than magnetic properties. Our work experimentally and theoretically discovers the dynamics of phonon modes of MnBi_{2n}Te_{3n+1} family, facilitating utilization of magnetic topological heterostructures. |
| first_indexed | 2024-04-24T10:15:49Z |
| format | Article |
| id | doaj.art-163a5a04733b46549da8daee2b00363c |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:15:49Z |
| publishDate | 2022-02-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-163a5a04733b46549da8daee2b00363c2024-04-12T17:18:00ZengAmerican Physical SocietyPhysical Review Research2643-15642022-02-014101310810.1103/PhysRevResearch.4.013108Phonon modes and Raman signatures of MnBi_{2n}Te_{3n+1}(n=1,2,3,4) magnetic topological heterostructuresYujin ChoJin Ho KangLiangbo LiangMadeline TaylorXiangru KongSubhajit GhoshFariborz KargarChaowei HuAlexander A. BalandinAlexander A. PuretzkyNi NiChee Wei WongAn intrinsic antiferromagnetic topological insulator MnBi_{2}Te_{4} arises when intercalating a Mn-Te bilayer chain in a topological insulator, Bi_{2}Te_{3}. We present observations on the inter- and intralayer phonon modes of the generalized MnBi_{2n}Te_{3n+1}(n=1,2,3,4) family using cryogenic low-frequency Raman spectroscopy with various polarization configurations. Two peaks at 66 and 112cm^{–1} show abnormal perturbation in Raman linewidths below magnetic transition temperature due to spin-phonon coupling. In MnBi_{4}Te_{7}, Bi_{2}Te_{3} layers induce Davydov splitting of the A_{1g} mode around 137cm^{–1} at 5 K. The out-of-plane interlayer force constant estimated using the linear chain model was (3.98±0.14)×10^{19}N/m^{3}, three times weaker than that of Bi_{2}Te_{3}. Adding more Bi_{2}Te_{3} layers, such as MnBi_{6}Te_{10} and MnBi_{8}Te_{13}, makes Bi_{2}Te_{3} properties more dominant than magnetic properties. Our work experimentally and theoretically discovers the dynamics of phonon modes of MnBi_{2n}Te_{3n+1} family, facilitating utilization of magnetic topological heterostructures.http://doi.org/10.1103/PhysRevResearch.4.013108 |
| spellingShingle | Yujin Cho Jin Ho Kang Liangbo Liang Madeline Taylor Xiangru Kong Subhajit Ghosh Fariborz Kargar Chaowei Hu Alexander A. Balandin Alexander A. Puretzky Ni Ni Chee Wei Wong Phonon modes and Raman signatures of MnBi_{2n}Te_{3n+1}(n=1,2,3,4) magnetic topological heterostructures Physical Review Research |
| title | Phonon modes and Raman signatures of MnBi_{2n}Te_{3n+1}(n=1,2,3,4) magnetic topological heterostructures |
| title_full | Phonon modes and Raman signatures of MnBi_{2n}Te_{3n+1}(n=1,2,3,4) magnetic topological heterostructures |
| title_fullStr | Phonon modes and Raman signatures of MnBi_{2n}Te_{3n+1}(n=1,2,3,4) magnetic topological heterostructures |
| title_full_unstemmed | Phonon modes and Raman signatures of MnBi_{2n}Te_{3n+1}(n=1,2,3,4) magnetic topological heterostructures |
| title_short | Phonon modes and Raman signatures of MnBi_{2n}Te_{3n+1}(n=1,2,3,4) magnetic topological heterostructures |
| title_sort | phonon modes and raman signatures of mnbi 2n te 3n 1 n 1 2 3 4 magnetic topological heterostructures |
| url | http://doi.org/10.1103/PhysRevResearch.4.013108 |
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