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Jamie Teherani

Uniaxial Strain is Scaled from Entered Value

Very nice tool!

I’m trying to calculate band structure in Si with unaxially applied strain in the < 100 > direction.

Tool version 2.06.

On the “Analysis” page of the tool: Select numerical simulation: “Strain Analysis” Strain Model: “Uniaxial” Strain Direction: “001” Initial Strain (Exx): “-0.01” Final Strain (Exx): “0.01” Number of Points: 21

On the simulate page, when I plot something such as Bandgap vs Strain, I only see data for Strain from -0.0028 to 0.0028. I do see 21 points of data.

Why is the strain being scaled from 0.01% strain to 0.0028% strain?

Thanks, Jamie

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Chosen Answer

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    Abhijeet Paul

    This issue has been fixed now and the plots are shown against the input strain range and not the fixed eps_xx range. Please see the version 2.0.7 in which this bug has been fixed. Thanks for bringing this to our notice.

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Responses (2)

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    Abhijeet Paul

    Hello This happens since the strain axis is along 001 which is the standard z axis. This means that the initial and final strain values of -0.01 and 0.01 are associated with Eps_zz and not with Eps_xx. The plots are always made with respect to Eps_xx. So the uniaxial strain value in 001 (Eps_zz) direction from -0.01 to 0.01 will have a values of -0.028 to 0.028 in the 100 direction (Eps_xx).

    I hope this answers your question.

    Thanks

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    1. Jamie Teherani

      Yes, I found this out and posted it in the question title “Followup: Uniaxial Strain is Scaled from Entered Value”

      I guess the inital and final strains are mislabeled on the analysis page?

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      1. Abhijeet Paul

        Can you clarify this a bit more ?

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        1. Jamie Teherani

          On the analysis page, when the simulation is setup to do a Strain Analysis, and the strain model is set to Uniaxial, and strain direction is 001, the program asks to specify in the initial and final strains along the Exx. However, these strains are actually being applied along Ezz.

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    Benjamin P Haley

    Thanks for bringing this to our attention. We will investigate this and get back to you.

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    1. Abhijeet Paul

      I think this has been a typo in the tool. I will take a look and fix it. Thanks for bringing this into light.

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