Tuneable Poisson’s ratio of monolayer GeS and Ge2SSe

Arun Jangir, Duc Tam Ho, Udo Schwingenschlögl*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.
Original languageEnglish
Article number101838
Number of pages4
JournalExtreme Mechanics Letters
Early online date16 Jul 2022
Publication statusPublished - 1 Oct 2022
Externally publishedYes

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