Screening of Polar Electron-Phonon Interactions near the Surface of the Rashba Semiconductor BiTeCl

Understanding electron-phonon coupling in noncentrosymmetric materials is critical for controlling the internal fields which give rise to Rashba interactions. We apply time- and angle-resolved photoemission spectroscopy (trARPES) to study coherent phonons in the surface and bulk regions of the polar semiconductor BiTeCl. Aided by ab initio calculations, our measurements reveal the coupling of out-of-plane A_{1} modes and an in-plane E_{2} mode. By considering how these modes modulate the electric dipole moment in each unit cell, we show that the polar A_{1} modes are more effectively screened in the metallic surface region, while the nonpolar E_{2} mode couples in both regions. In addition to informing strategies to optically manipulate Rashba interactions, this Letter has broader implications for the behavior of electron-phonon coupling in systems characterized by inhomogeneous dielectric environments.

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Publication Details

Journal
Physical Review Letters
Published
2024-09-03
DOI
https://doi.org/10.1103/physrevlett.133.106401
Citations
4
Primary Topic
Electronic and Structural Properties of Oxides
Type
article
Field-Weighted Citation Impact
0.47

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article

Screening of Polar Electron-Phonon Interactions near the Surface of the Rashba Semiconductor BiTeCl

J. Liu, Xue Han, Zhi‐Xun Shen, P. S. Kirchmann et al.
4 citations
Physical Review Letters
Electronic and Structural Properties of Oxides
0.47
article

Screening of Polar Electron-Phonon Interactions near the Surface of the Rashba Semiconductor BiTeCl

J. Liu, Xue Han, Zhi‐Xun Shen, P. S. Kirchmann, Thomas Devereaux, Jonathan A. Sobota, Y. J. Zeng, Brian Moritz, Jason Qu, Emma Frances Cuddy, Hui Li
article en
4 citations

Abstract

Understanding electron-phonon coupling in noncentrosymmetric materials is critical for controlling the internal fields which give rise to Rashba interactions. We apply time- and angle-resolved photoemission spectroscopy (trARPES) to study coherent phonons in the surface and bulk regions of the polar semiconductor BiTeCl. Aided by ab initio calculations, our measurements reveal the coupling of out-of-plane A_{1} modes and an in-plane E_{2} mode. By considering how these modes modulate the electric dipole moment in each unit cell, we show that the polar A_{1} modes are more effectively screened in the metallic surface region, while the nonpolar E_{2} mode couples in both regions. In addition to informing strategies to optically manipulate Rashba interactions, this Letter has broader implications for the behavior of electron-phonon coupling in systems characterized by inhomogeneous dielectric environments.

Physical Review LettersVol. 133(10)
Shenzhen University (CN), SLAC National Accelerator Laboratory (US), Shenzhen Technology University (CN), Stanford University (US)
U.S. Department of Energy, National Energy Research Scientific Computing Center, Basic Energy Sciences, Division of Materials Sciences and Engineering
Openalex Percentile: Top 39%
Electronic and Structural Properties of Oxides
0.47
DOIOpen Access PDFOpenAlex
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