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Homework Help: Transmission Coefficient for Quantum Barrier

  1. Jan 14, 2015 #1
    1. The problem statement, all variables and given/known data

    Picture of Problem:


    2. Relevant equations

    $$\psi(x) = A_n e^{ikx} + B_n e^{-ikx}$$ for n=1,2,3

    3. The attempt at a solution

    I know i need to relate the wave functions $$A_n e^{ikx} + B_n e^{-ikx}$$ for n=1,2,3 (the three areas of the barrier - before barrier, inside barrier, after barrier), such that the values of the functions at the barrier edges as well as their derivatives are equal. But i am not sure how to solve for each coefficient. Also how does the length of the barrier, d, come into play?

    k is equal to $$\sqrt{\frac{2mE}{\hbar^2}}$$ outside the barrier and $$\sqrt{\frac{2m(E-V)}{\hbar^2}}$$ inside the barier.
    Last edited: Jan 14, 2015
  2. jcsd
  3. Jan 15, 2015 #2


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    Why don't you start by writing down the equations you get?
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