Structural, electronic and intrinsic transport in two-dimensional borophene sheets

TL;DR

This study uses density functional theory to analyze the stability, electronic, and transport properties of two-dimensional borophene sheets, revealing tunable anisotropic transport behavior influenced by strain.

Contribution

It provides new insights into the strain-dependent stability and anisotropic transport properties of borophene polymorphs, which were not previously characterized in detail.

Findings

Directional dependency in electron transport confirmed.

Strain influences the anisotropy of current-voltage characteristics.

Tunable transport properties under external strain observed.

Abstract

Experimental realization of two-dimensional boron sheets was reported very recently by Feng et. al. using molecular beam epitaxy on silver (111) surface. These boron sheets possess promising electronic and transport properties. We performed the density functional theory (DFT) calculation to see the stability of two $\beta_{12}$ and $\chi$ polymorphs of boron under strain and further studied electronic and transport properties. We verified the directional dependency in electron transport properties in these two boron polymorphs. Here we report tunable anisotropic transport properties of the borophenes. We also investigated current-voltage characteristics in low bias regime after applying strain on these systems to see how this external strain affects the anisotropy of current.