Isotope engineering of carrier mobility via Fr\"ohlich electron-phonon interaction
Abstract
Isotope effects on phonon properties and transport have been predicted and observed for decades. However, despite the crucial impact of electron-phonon interactions, the effect of isotopes on electron transport remains largely unexplored. Here, by using first-principles calculations, we theoretically predict that the electron mobility of lithium hydride (LiH) can increase by up to ~100% as is replaced with . This remarkable phenomenon is primarily attributed to the isotope engineering of the Fr\"ohlich interaction by the mass-induced line shift of the longitudinal optical (LO) phonons. Notably, the isotope-dependent absorption of LO phonons dominates while the isotope-insensitive emission process is mostly suppressed due to energy conservation. We further propose general guidelines for evaluating isotope effects on carrier transport in different materials.
Keywords
Cite
@article{arxiv.2401.15283,
title = {Isotope engineering of carrier mobility via Fr\"ohlich electron-phonon interaction},
author = {Wenjiang Zhou and Te-Huan Liu and Bai Song},
journal= {arXiv preprint arXiv:2401.15283},
year = {2025}
}