Hi
The Poisson ratio definition is: the ratio of transverse strain to axial strain.And due to my knowledge if we want to apply a uni-axial ( for example in a direction) strain on the cell of 2D structure we should a bit increase the corresponding cell vector (say a ) and related atomic positions. Now, what is the transverse strain when we applied an uni-axial strain on a 2D structure cell? because the change applied only in a direction, it seems that the transverse change (or the transverse strain) is zero. Am I right?
Dear Hossein, to calculate the poisson's ratio of 2D structures you can for example extract the C11 and C12 elastic constants, since the poisson's ratio can be defined as C12 divided by C11.
If you apply a uniaxial strain you can obtain the C11, with a isotropical strain you can obtain the C12, just plotting a graph of the Uniaxial/Isotropic strain over the total energy and getting the second derivative of it.
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