Tuneable Poisson’s ratio of monolayer GeS and Ge2SSe

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 n...

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Bibliographic Details
Published inExtreme Mechanics Letters Vol. 56; p. 101838
Main Authors Jangir, Arun, Ho, Duc Tam, Schwingenschlögl, Udo
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2022
Subjects
2D material
Electric field
Poisson’s ratio
Poisson’s ratio
Electric field
2D material
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Summary: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.
ISSN:2352-4316
2352-4316
DOI:10.1016/j.eml.2022.101838