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arXiv · 1804.06889

High temperature electron-hole superfluidity with strong anisotropic gaps in double phosphorene monolayers

S. Saberi-Pouya·M. Zarenia·A. Perali·T. Vazifehshenas·F. M. Peeters
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Abstract

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 $\sim 90$ K with onset carrier densities as high as $4 \times 10^{12}$ 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.

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S. Saberi-Pouya, M. Zarenia, A. Perali, T. Vazifehshenas, F. M. Peeters. 2018-04-18. High temperature electron-hole superfluidity with strong anisotropic gaps in double phosphorene monolayers. https://doi.org/10.1103/physrevb.97.174503

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