Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
2D dirac equation for graphene
Posted Mar 30, 2010, 2:34 p.m. EDT 1 Reply
Please login with a confirmed email address before reporting spam
I am trying to simulate graphene using Dirac equation in 2D. First, I wanted to try something simple like free particle and particle in a box using Dirac equation (rather than Schrodinger equation). I used PDE modes -> PDE, Coefficient Form -> Eigenvalue analysis. I put 'u1 u2' as the dependent variables and enter the coefficient as in the Dirac equation. For boundary condition, I specified 'u' to be zero at the boundaries (particle in a box).
However, the result that I got indicate the energy level (eigenvalues) as complex numbers and the wavefunctions spread out to the edge as attached (not form a standing wave pattern as expected).
I don't know what wrong with the model. Note that, I tried with Schrodinger equation and it works. So, the differences are only the equations in subdomain.
Any idea will be much appreciated. Thank you in advance.
Sansiri
Attachments:
Hello Sansiri
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.
Please login with a confirmed email address before reporting spam
Did you managed to get your model working? If not you could try upload your model file, this would make it a lot easier to find problems with your model and try and solve them.
Best Wishes
Daniel