Excitonic superfluidity in double phosphorene monolayers is investigated using the BCS mean-field equations. Highly anisotropic superfluidity is predicted where we found that the maximum superfluid gap is in the BEC regime along the armchair direction and in the BCS-BEC crossover regime along the zigzag direction. We estimate the highest Kosterlitz-Thouless transition temperature with maximum value up to ∼90 K with onset carrier densities as high as 4×1012 cm−2. This transition temperature is significantly larger than what is found in double electron-hole few-layers of graphene. Our results can guide experimental research towards the realization of anisotropic condensate states in electron-hole phosphorene monolayers.
@article{arxiv.1804.06889,
title = {High temperature electron-hole superfluidity with strong anisotropic gaps in double phosphorene monolayers},
author = {S. Saberi-Pouya and M. Zarenia and A. Perali and T. Vazifehshenas and F. M. Peeters},
journal= {arXiv preprint arXiv:1804.06889},
year = {2018}
}