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Debanjana adhikari Asked a Question
May 19, 2020 10:42 ampts 30 pts
  • 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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  • Ruby negi
    remember first brillouin zone is at the k value of +-π/2a
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  • Vaishnavi rajora thankyou
    at first Brillouin zone it will be zero. see the attached
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  • Abhishek singh
    See attached.
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  • Ruby negi
    remember omega/k is phase velocity and d(omega)/dk is group velocity.
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