Auxetic and Ferroelastic Borophane: A Novel 2D Material with Negative Possion's Ratio and Switchable Dirac Transport Channels
Document Type
Article
Publication Date
1-1-2016
Publication Title
Nano Letters
Volume
16
Issue
12
First page number:
7910
Last page number:
7914
Abstract
Recently synthesized atomically thin boron sheets (that is, borophene) provide a fascinating template for new material property discovery. Here, we report findings of an extraordinary combination of unusual mechanical and electronic properties in hydrogenated borophene, known as borophane, from first-principles calculations. This novel 2D material has been shown to exhibit robust Dirac transport physics. Our study unveils that borophane is auxetic with a surprising negative Poisson's ratio stemming from its unique puckered triangle hinge structure and the associated hinge dihedral angle variation under a tensile strain in the armchair direction. Our results also identify borophane to be ferroelastic with a stress-driven 90° lattice rotation in the boron layer, accompanied by a remarkable orientation switch of the anisotropic Dirac transport channels. These outstanding strain-engineered properties make borophane a highly versatile and promising 2D material for innovative applications in microelectromechanical and nanoelectronic devices. © 2016 American Chemical Society.
Keywords
auxeticity; Borophane; ferroelasticity; switchable Dirac transport channels
File Format
File Size
1890 KB
Language
English
Repository Citation
Kou, L.,
Ma, Y.,
Tang, C.,
Sun, Z.,
Du, A.,
Chen, C.
(2016).
Auxetic and Ferroelastic Borophane: A Novel 2D Material with Negative Possion's Ratio and Switchable Dirac Transport Channels.
Nano Letters, 16(12),
7910-7914.
http://dx.doi.org/10.1021/acs.nanolett.6b04180
