Spin-Mediated Direct Photon Scattering by Plasmons in BiTeI
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arXiv
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| Hauptverfasser: | , , , , , , , , |
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| Format: | Preprint |
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2023
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| author | Lee, A. C. Sarkar, S. Du, K. Kung, H. -H. Won, C. J. Wang, K. Cheong, S. -W. Maiti, S. Blumberg, G. |
| author_facet | Lee, A. C. Sarkar, S. Du, K. Kung, H. -H. Won, C. J. Wang, K. Cheong, S. -W. Maiti, S. Blumberg, G. |
| contents | We use polarization resolved Raman spectroscopy to demonstrate that for a 3D giant Rashba system the bulk plasmon collective mode can directly couple to the Raman response even in the long wavelength $\mathbf q \rightarrow 0$ limit. Although conventional theory predicts the plasmon spectral weight to be suppressed as the square of its quasi-momentum and thus negligibly weak in the Raman spectra, we observe a sharp in-gap plasmon mode in the Raman spectrum of BiTeI below the Rashba continuum. This coupling, in a polar system with spin-orbit coupling, occurs without assistance from phonons when the incoming photon excitation is resonant with Rashba-split intermediate states. We discuss the distinctive features of BiTeI's giant Rashba system band structure that enable the direct observation of plasmon in Raman scattering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_04394 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Spin-Mediated Direct Photon Scattering by Plasmons in BiTeI Lee, A. C. Sarkar, S. Du, K. Kung, H. -H. Won, C. J. Wang, K. Cheong, S. -W. Maiti, S. Blumberg, G. Strongly Correlated Electrons We use polarization resolved Raman spectroscopy to demonstrate that for a 3D giant Rashba system the bulk plasmon collective mode can directly couple to the Raman response even in the long wavelength $\mathbf q \rightarrow 0$ limit. Although conventional theory predicts the plasmon spectral weight to be suppressed as the square of its quasi-momentum and thus negligibly weak in the Raman spectra, we observe a sharp in-gap plasmon mode in the Raman spectrum of BiTeI below the Rashba continuum. This coupling, in a polar system with spin-orbit coupling, occurs without assistance from phonons when the incoming photon excitation is resonant with Rashba-split intermediate states. We discuss the distinctive features of BiTeI's giant Rashba system band structure that enable the direct observation of plasmon in Raman scattering. |
| title | Spin-Mediated Direct Photon Scattering by Plasmons in BiTeI |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2310.04394 |