CrN/MgO(111) multilayers modeled via \textit{ab initio} calculations give rise to nanoscale, scalable, spatially separated two-dimensional electron and hole gases (2DEG+2DHG), each confined to its own CrN interface. Due to the Cr 3d3 configuration, both electron and hole gases are based on correlated transition metal layers involving bands of 3d character. Transport calculations predict each subsystem will have a large thermopower, on the order of 250 μV/K at room temperature. These heterostructures combine a large thermoelectric efficiency with scalable nanoscale conducting sheets; for example, operating at a temperature difference of 50K, 40 bilayers could produce a 1 V voltage with a film thickness of 100 nm.
@article{arxiv.1705.04534,
title = {All 3d electron-hole bilayers in CrN/MgO(111) multilayers},
author = {Antia S. Botana and Victor Pardo and Warren E. Pickett},
journal= {arXiv preprint arXiv:1705.04534},
year = {2017}
}