Spin-mediated direct photon scattering by plasmons in BiTeI

A. C. Lee; S. Sarkar; K. Du; H. H. Kung; C. J. Won; K. Wang; Sang-Wook Cheong; S. Maiti; G. Blumberg

doi:10.1103/PhysRevB.109.L041111

Spin-mediated direct photon scattering by plasmons in BiTeI

A. C. Lee, S. Sarkar, K. Du, H. H. Kung, C. J. Won, K. Wang, Sang-Wook Cheong, S. Maiti, G. Blumberg

School of Arts and Sciences, Physics & Astronomy

Rutgers, The State University

Research output: Contribution to journal › Article › peer-review

Abstract

We use polarization-resolved Raman spectroscopy to demonstrate that for a three-dimensional giant Rashba system the bulk plasmon collective mode can directly couple to the Raman response even in the long-wavelength q→0 limit. Although conventional theory predicts the plasmon spectral weight to be suppressed as the square of its quasimomentum 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 plasmons in Raman scattering.

Original language	English (US)
Article number	L041111
Journal	Physical Review B
Volume	109
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevB.109.L041111
State	Published - Jan 15 2024

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.109.L041111

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title = "Spin-mediated direct photon scattering by plasmons in BiTeI",

abstract = "We use polarization-resolved Raman spectroscopy to demonstrate that for a three-dimensional giant Rashba system the bulk plasmon collective mode can directly couple to the Raman response even in the long-wavelength q→0 limit. Although conventional theory predicts the plasmon spectral weight to be suppressed as the square of its quasimomentum 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 plasmons in Raman scattering.",

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T1 - Spin-mediated direct photon scattering by plasmons in BiTeI

AU - Lee, A. C.

AU - Sarkar, S.

AU - Du, K.

AU - Kung, H. H.

AU - Won, C. J.

AU - Wang, K.

AU - Cheong, Sang-Wook

AU - Maiti, S.

AU - Blumberg, G.

PY - 2024/1/15

Y1 - 2024/1/15

N2 - We use polarization-resolved Raman spectroscopy to demonstrate that for a three-dimensional giant Rashba system the bulk plasmon collective mode can directly couple to the Raman response even in the long-wavelength q→0 limit. Although conventional theory predicts the plasmon spectral weight to be suppressed as the square of its quasimomentum 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 plasmons in Raman scattering.

AB - We use polarization-resolved Raman spectroscopy to demonstrate that for a three-dimensional giant Rashba system the bulk plasmon collective mode can directly couple to the Raman response even in the long-wavelength q→0 limit. Although conventional theory predicts the plasmon spectral weight to be suppressed as the square of its quasimomentum 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 plasmons in Raman scattering.

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Spin-mediated direct photon scattering by plasmons in BiTeI

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