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phonon wave vector

Hi everyone it is the first time for me to work on comsol and I want to calculate the phonon modes in nanowire but I don't know how to extract the wave-vectors corresponding to the eigenfrequencies of...

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Re: phonon wave vector

Have you had any luck? I am interested in this as well.

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Re: phonon wave vector

hi, could u find out how? I dont know how to define bloch boundary condition in solid mechanics physics.

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Re: phonon wave vector

You can manually define a Bloch boundary condition between two boundaries B1 and B2 by applying on boundary B1 a prescribed displacement of the form bndsim1(u)*exp(i*kx*L) where bndsim1() is a boundary...

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Re: phonon wave vector

I am trying to solve nanowire`s phonon dispersion. But I have trouble in solving it. I used 2D axis & 3D circular design. But I can not get satisfied results.. (I used structure mechanics ->...

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Re: phonon wave vector

How is a continuum model going to give optical phonon modes? Seems at best you can get only a linear approximation for low-k.

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Re: phonon wave vector

I need to solve acoustic phonon modes & some lower optical modes. If I use continuum model, I can not solve optical modes? Could I know linear approximation setting method?

View Article

phonon wave vector

Hi everyone it is the first time for me to work on comsol and I want to calculate the phonon modes in nanowire but I don't know how to extract the wave-vectors corresponding to the eigenfrequencies of...

View Article


Re: phonon wave vector

Have you had any luck? I am interested in this as well.

View Article


Re: phonon wave vector

hi, could u find out how? I dont know how to define bloch boundary condition in solid mechanics physics.

View Article

Re: phonon wave vector

You can manually define a Bloch boundary condition between two boundaries B1 and B2 by applying on boundary B1 a prescribed displacement of the form bndsim1(u)*exp(i*kx*L) where bndsim1() is a boundary...

View Article

Re: phonon wave vector

I am trying to solve nanowire`s phonon dispersion. But I have trouble in solving it. I used 2D axis & 3D circular design. But I can not get satisfied results.. (I used structure mechanics ->...

View Article

Re: phonon wave vector

How is a continuum model going to give optical phonon modes? Seems at best you can get only a linear approximation for low-k.

View Article


Re: phonon wave vector

I need to solve acoustic phonon modes & some lower optical modes. If I use continuum model, I can not solve optical modes? Could I know linear approximation setting method?

View Article
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