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Debanjana Adhikari posted an Question
May 19, 2020 • 16:12 pm 30 points
  • CSIR NET
  • Physical Sciences

The dispersion relation for a one dimensional monatomic crystal with lattice spacing a, which interacts nearest neighbour harmonic potential is given by asin aa

The dispersion relation for a one dimensional monatomic crystal with lattice spacing a, which interacts nearest neighbour harmonic potential is given by Asin Aa where A is a constant of appropriate unit. The group velocity at the boundary of the first Brillouin zone is

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    Dhairya sharma best-answer

    at first Brillouin zone it will be zero. see the attached

    cropped8442229835058857084.jpg
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    Ruby negi

    remember omega/k is phase velocity and d(omega)/dk is group velocity.

    cropped-66620370.jpg
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