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Half-Auxeticity and Anisotropic Transport in Pd Decorated Two-Dimensional Boron Sheets

preprint
revised on 21.12.2020, 15:16 and posted on 22.12.2020, 09:24 by Fengxian Ma, Yalong Jiao, Weikang Wu, Ying Liu, Shengyuan A. Yang, Thomas Heine

If one strains a material, most materials shrink normal to the direction of applied strain. Similarly, if a material is compressed, it will expand in the direction orthogonal to the pressure. Few materials, those of negative Poisson ratio, show the opposite behavior. Here, we show an unprecedented feature, a material that expands normal to the direction of stress, regardless if it is strained or compressed. Such behavior, namely half-auxeticity, is demonstrated for a borophene sheet stabilized by decorating Pd atoms. We explore Pd-decorated borophene, identify three stable phases of which one has this peculiar property of half auxeticity. After carefully analyzing stability, mechanical and electronic properties we explore the origin of this very uncommon behavior, and identify it as a structural feature that may also be employed to design further 2D nanomaterials.


History

Email Address of Submitting Author

thomas.heine@tu-dresden.de

Institution

TU Dresden

Country

Germany

ORCID For Submitting Author

0000-0003-2379-6251

Declaration of Conflict of Interest

No conflict of interest

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