Electric field – velocity relation for strongly coupled Fröhlich polaron in emerging 2D materials

Abstract

Abstract In this paper we evaluate the electric field—velocity relation for strong electron—LO phonon coupled 2D materials namely Hf S 2 , HfS e 2 , Zr S 2 and ZrS e 2 by applying Thornber—Feynman (TF) formalism applied to the case of the 2D Fröhlich polaron. We demonstrate that the generally-accepted Fermi’s Golden Rule based approach breaks down for these strongly coupled materials. We predict ZrS e 2 has highest mobility of 449 c m 2 / V -s at room temperature followed by HfS e 2 with 240 c m 2 / V -s whereas other materials have below 100 c m 2 / V -s.