Anomalous phonon-mode dependence in polarized Raman spectroscopy of the topological Weyl semimetal TaP
Topological Weyl semimetals (WSMs) have attracted widespread interest due to the chiral Weyl fermions and surface Fermi arcs that enable unique optical and transport phenomena. In this work, we present angle-resolved Raman spectroscopy of TaP, a prototypical noncentrosymmetric WSM, for five excitati...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2020
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| Online Access: | https://hdl.handle.net/1721.1/125587 |
| _version_ | 1826213584793763840 |
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| author | Zhang, Kunyan Pang, Xiaoqi Wang, Tong Han, Fei Shang, Shun-Li Hung, Nguyen T. Nugraha, Ahmad R. T. Liu, Zi-Kui Li, Mingda Saito, Riichiro Huang, Shengxi |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Zhang, Kunyan Pang, Xiaoqi Wang, Tong Han, Fei Shang, Shun-Li Hung, Nguyen T. Nugraha, Ahmad R. T. Liu, Zi-Kui Li, Mingda Saito, Riichiro Huang, Shengxi |
| author_sort | Zhang, Kunyan |
| collection | MIT |
| description | Topological Weyl semimetals (WSMs) have attracted widespread interest due to the chiral Weyl fermions and surface Fermi arcs that enable unique optical and transport phenomena. In this work, we present angle-resolved Raman spectroscopy of TaP, a prototypical noncentrosymmetric WSM, for five excitation wavelengths ranging from 364 to 785 nm. The Raman-active modes, A_{1}, B_{1}^{1}, and B_{1}^{2} modes, exhibit two main unique features beyond the conventional Raman theory. First, the relative intensities of Raman-active modes change as a function of the excitation wavelength. Second, angle-resolved polarized Raman spectra show systematic deviation from the Raman tensor theory. In particular, the B_{1}^{1} mode is absent for 633-nm excitation, whereas the B_{1}^{2} mode shows an unusual twofold symmetry instead of a fourfold symmetry for 488-, 532-, and 633-nm excitations. These unconventional phenomena are attributed to the interference effect in the Raman process owing to the existence of multiple carrier pockets with almost the same energy but different symmetries. |
| first_indexed | 2024-09-23T15:51:35Z |
| format | Article |
| id | mit-1721.1/125587 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:51:35Z |
| publishDate | 2020 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1255872022-09-29T16:37:52Z Anomalous phonon-mode dependence in polarized Raman spectroscopy of the topological Weyl semimetal TaP Zhang, Kunyan Pang, Xiaoqi Wang, Tong Han, Fei Shang, Shun-Li Hung, Nguyen T. Nugraha, Ahmad R. T. Liu, Zi-Kui Li, Mingda Saito, Riichiro Huang, Shengxi Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Topological Weyl semimetals (WSMs) have attracted widespread interest due to the chiral Weyl fermions and surface Fermi arcs that enable unique optical and transport phenomena. In this work, we present angle-resolved Raman spectroscopy of TaP, a prototypical noncentrosymmetric WSM, for five excitation wavelengths ranging from 364 to 785 nm. The Raman-active modes, A_{1}, B_{1}^{1}, and B_{1}^{2} modes, exhibit two main unique features beyond the conventional Raman theory. First, the relative intensities of Raman-active modes change as a function of the excitation wavelength. Second, angle-resolved polarized Raman spectra show systematic deviation from the Raman tensor theory. In particular, the B_{1}^{1} mode is absent for 633-nm excitation, whereas the B_{1}^{2} mode shows an unusual twofold symmetry instead of a fourfold symmetry for 488-, 532-, and 633-nm excitations. These unconventional phenomena are attributed to the interference effect in the Raman process owing to the existence of multiple carrier pockets with almost the same energy but different symmetries. US DOE BES Award No. DE-SC0020148 2020-05-29T16:45:45Z 2020-05-29T16:45:45Z 2020-01 2020-01 2020-01-30T16:00:48Z Article http://purl.org/eprint/type/JournalArticle 2469-9969 2469-9950 https://hdl.handle.net/1721.1/125587 Zhang, Kunyan, et al. "Anomalous phonon-mode dependence in polarized Raman spectroscopy of the topological Weyl semimetal TaP." Physical Review B, 101, 1 (January 2020): 014308. © 2020 American Physical Society en http://dx.doi.org/10.1103/PhysRevB.101.014308 Physical Review B Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Zhang, Kunyan Pang, Xiaoqi Wang, Tong Han, Fei Shang, Shun-Li Hung, Nguyen T. Nugraha, Ahmad R. T. Liu, Zi-Kui Li, Mingda Saito, Riichiro Huang, Shengxi Anomalous phonon-mode dependence in polarized Raman spectroscopy of the topological Weyl semimetal TaP |
| title | Anomalous phonon-mode dependence in polarized Raman spectroscopy of the topological Weyl semimetal TaP |
| title_full | Anomalous phonon-mode dependence in polarized Raman spectroscopy of the topological Weyl semimetal TaP |
| title_fullStr | Anomalous phonon-mode dependence in polarized Raman spectroscopy of the topological Weyl semimetal TaP |
| title_full_unstemmed | Anomalous phonon-mode dependence in polarized Raman spectroscopy of the topological Weyl semimetal TaP |
| title_short | Anomalous phonon-mode dependence in polarized Raman spectroscopy of the topological Weyl semimetal TaP |
| title_sort | anomalous phonon mode dependence in polarized raman spectroscopy of the topological weyl semimetal tap |
| url | https://hdl.handle.net/1721.1/125587 |
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