james walshe
- 7
- 0
Hi all,
If you are given the real space lattice vectors (14 Angstroms in the x-direction and 8 Angstroms wit an angle of 91 degrees between them) and have to draw the reciprocal lattice and the the first Brillouin zone, and then using this data sketch the E-k graph and comment on the band-gap structure.
I can graph the reciprocal lattice and the first Brillouin zone, and I sketched the E-k graph using:
k=(pie/a) and k=(pie/b) where a and b are the real space lattice vectors. From this I can determine the energy of the middle of the band using:
E=((h-bar)^2 *(k)^2/(2*m))
where the two values of k were used, which gave two different energy values. Using this information how do I determine the width of the band gap or its band-gap energy.
If you are given the real space lattice vectors (14 Angstroms in the x-direction and 8 Angstroms wit an angle of 91 degrees between them) and have to draw the reciprocal lattice and the the first Brillouin zone, and then using this data sketch the E-k graph and comment on the band-gap structure.
I can graph the reciprocal lattice and the first Brillouin zone, and I sketched the E-k graph using:
k=(pie/a) and k=(pie/b) where a and b are the real space lattice vectors. From this I can determine the energy of the middle of the band using:
E=((h-bar)^2 *(k)^2/(2*m))
where the two values of k were used, which gave two different energy values. Using this information how do I determine the width of the band gap or its band-gap energy.