The control of out-of-equilibrium electron dynamics in topological insulators is essential to unlock their potential in next-generation quantum technologies. However, the role of temperature on the renormalization of the electronic band structure and, consequently, on electron scattering processes is still elusive. Here, using high-resolution time- and angle-resolved photoemission spectroscopy (TR-ARPES), we show that even a modest (∼15 meV) renormalization of the conduction band of Bi2Te3 can critically affect bulk and surface electron scattering processes. Supported by a kinetic Monte Carlo toy-model, we show that temperature-induced changes in the bulk band structure modulate the intervalley electron-phonon scattering rate, reshaping the out-of-equilibrium response. This work establishes temperature as an effective control knob for engineering scattering pathways in topological insulators.
@article{arxiv.2506.03251,
title = {Control of intervalley scattering in Bi$_2$Te$_3$ via temperature-dependent band renormalization},
author = {A. Jabed and F. Goto and B. Frimpong and D. Armanno and A. Longa and M. Michiardi and A. Damascelli and P. Hofmann and G. Jargot and H. Ibrahim and F. Légaré and N. Gauthier and S. Beaulieu and F. Boschini},
journal= {arXiv preprint arXiv:2506.03251},
year = {2026}
}