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Phonons in nanowire

Posted Nov 8, 2010, 12:42 p.m. EST 3 Replies

Hussein Ayedh
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Hi ,
I'm doing simulation about the phonons in nanowires by comsol35 depending on the continuum model,then I I've used the structural mechanics module - solid ,strain stress - Eigenfrequency analysis ,by using the GUI not by script and I got at the end the eigenmodes with their eigenfrequencies, but when I wanted to get the wavevectors that correspond the eigenfrequencies I couldn't,
the process I used as the following:
- design the cylindrical nanowire by the GUI radius=20nm, L=225nm and the material is GaAs ,then the sample is meshed (free mesh) then I solved that for 30 eigenfrequency .
finally from the postprocessing one can get the eigenfrequency easily, but the problem is how to get the wavevector.

I still newbie in comsol so if someone knows how to do that please please help me .
3 Replies Last Post Jun 11, 2015, 2:12 a.m. EDT
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Hello Hussein Ayedh

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Hyunjoon Park
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Posted: 10 years ago May 5, 2015, 4:57 a.m. EDT
I have same problem,,
Could you tell me how solved that?
I really thanks about any comments.
I have same problem,, Could you tell me how solved that? I really thanks about any comments.
Daniel Connelly
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Posted: 10 years ago May 6, 2015, 12:26 p.m. EDT
How do you define the wave numbers? Based on longitudinal periodicity?
How do you define the wave numbers? Based on longitudinal periodicity?
Hyunjoon Park
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Posted: 10 years ago Jun 11, 2015, 2:12 a.m. EDT
yes, At first, I set lattice constant(= a ), I set periodicity for longitudinal direction.

But I got the bad result(y-axis figure is smaller than expected value.)
yes, At first, I set lattice constant(= a ), I set periodicity for longitudinal direction. But I got the bad result(y-axis figure is smaller than expected value.)

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