Enhanced Electron Reflectionat Mott-Insulator Interfaces
Abstract
The Klein paradox describes an incoming electron being scattered at a supercritical barrier to create electron-positron pairs, a phenomenon widely discussed in textbooks. While demonstrating this phenomenon experimentally with the fundamental particles remains challenging, condensed matter analogs are more accessible to experimental realization. For spinless quasi-particles, theoretical works show an enhancement of the pair production rate, and analogs of this effect in condensed matter systems have been studied theoretically. Here, we present another condensed matter system, a heterostructure comprised of two materials with strongly and weakly interacting electrons, that allows for constructing analytical solutions using the hierarchy-of-correlations method. The results show enhanced electron reflection related with the production of doublon-holon pairs, as known from the Klein paradox.
Cite
@article{arxiv.2601.05140,
title = {Enhanced Electron Reflectionat Mott-Insulator Interfaces},
author = {Jan Verlage and Peter Kratzer},
journal= {arXiv preprint arXiv:2601.05140},
year = {2026}
}