Upon strain, 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 and 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.
|Number of pages||7|
|Publication status||Published - 2021 Mar 24|
Bibliographical noteFunding Information:
F.M. acknowledges the support from the National Natural Science Foundation of China (Grants 11847017 and 11904077) and Science Foundation of Hebei Normal University (Grant L2019B09) and the financial support program from Hebei Province (Grant E2019050018). Y.J. appreciates the funding from the Alexander von Humboldt Foundation. S.A.Y. is supported by the Singapore MOE AcRF Tier 2 (Grant MOE2019-T2-1-001). The high-performance computer center of TU Dresden (ZIH) is thanked for computer time.
© 2021 American Chemical Society. All rights reserved.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering