Distinguishing Thermal Fluctuations from Polaron Formation in Halide Perovskites

Author(s): Bai-Qing Zhao, Jue-Yi Qi, Xun Xu, Xuan-Yan Chen, Chuan-Nan Li, Jinshan Li, Chris G. Van de Walle, and Xie Zhang Recent angle-resolved photoelectron spectroscopy (ARPES) measurements of the hole effective mass in ${\mathrm{CsPbBr}}_{3}$ revealed an enhancement of $∼50%$ compared to the bare mass computed from first principles for ${\mathrm{CsPbBr}}_{3}$ at $T=0\text{ }\text{ }\mathrm{K}$. This large enhancemen… [Phys. Rev. Lett. 134, 226402] Published Thu Jun 05, 2025