A tuneable Poisson's ratio is desirable to extend the applications of 2D materials. We demonstrate that Poisson's ratio of monolayer GeS depends approximately linear on the applied strain and electric field strength. In contrast, monolayer Ge2SSe is subject to abrupt switching between positive and negative values (sign reversal) at particular critical values of the strain and electric field strength. The tuneability of Poisson's ratio is attributed to the interplay of different bending stiffnesses. A structural transition is identified as origin of the sign reversal in the case of monolayer Ge2SSe.
Bibliographical noteFunding Information:
The authors thank Dr. Paresh C. Rout for fruitful discussions. The research reported in this publication was supported by funding from the King Abdullah University of Science and Technology (KAUST) .
© 2022 Elsevier Ltd
- 2D material
- Electric field
- Poisson's ratio
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Engineering (miscellaneous)
- Mechanics of Materials
- Mechanical Engineering