In this tutorial page 17, it says: "Aluminum is even simpler than Silicon: one atom per unit cell in a fcc lattic".
If it is FCC, then it should be the same as Silicon, two atoms per unit cell, ibrav=2.
I have a very small part of a protein that is supposed to be helical. However, in molecular dynamics simulation, it unfolds and gets into extended conformation. Is there any way I can force it to stay helical by applying any restraints, or any other biases? Thanks.