Loading…
Ultrafast Measurements of Mode-Specific Deformation Potentials of Bi 2 Te 3 and Bi 2 Se 3
Quantifying electron-phonon interactions for the surface states of topological materials can provide key insights into surface-state transport, topological superconductivity, and potentially how to manipulate the surface state using a structural degree of freedom. We perform time-resolved x-ray diff...
Saved in:
Published in: | Physical review. X 2023-12, Vol.13 (4), Article 041050 |
---|---|
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | Quantifying electron-phonon interactions for the surface states of topological materials can provide key insights into surface-state transport, topological superconductivity, and potentially how to manipulate the surface state using a structural degree of freedom.
We perform time-resolved x-ray diffraction (XRD) and angle-resolved photoemission (ARPES) measurements on Bi$_2$Te$_3$ and Bi$_2$Se$_3$, following the excitation of coherent A$_{1g}$ optical phonons.
We extract and compare the deformation potentials coupling the surface electronic states to local A$_{1g}$-like displacements in these two materials using the experimentally determined atomic displacements from XRD and electron band shifts from ARPES.
We find the coupling in Bi$_2$Te$_3$ and Bi$_2$Se$_3$ to be similar and in general in agreement with expectations from density functional theory.
We establish a methodology that quantifies the mode-specific electron-phonon coupling experimentally, allowing detailed comparison to theory.
Our results shed light on fundamental processes in topological insulators involving electron-phonon coupling. |
---|---|
ISSN: | 2160-3308 2160-3308 |
DOI: | 10.1103/PhysRevX.13.041050 |