Problem 2.34 Consider the "step" potential:53 V (x) = [0, x ≤0, Vo, x > 0. (a) Calculate the reflection coefficient, for the case E < Vo, and comment on the answer. (b) Calculate the reflection coefficient for the case E > Vo

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Problem 2.34 Consider the "step" potential:53
V (x) =
[0, x ≤0,
Vo, x > 0.
(a) Calculate the reflection coefficient, for the case E < Vo, and comment on
the answer.
(b) Calculate the reflection coefficient for the case E > Vo
Transcribed Image Text:Problem 2.34 Consider the "step" potential:53 V (x) = [0, x ≤0, Vo, x > 0. (a) Calculate the reflection coefficient, for the case E < Vo, and comment on the answer. (b) Calculate the reflection coefficient for the case E > Vo
(c) For a potential (such as this one) that does not go back to zero to the
right of the barrier, the transmission coefficient is not simply | F²/A2
(with A the incident amplitude and F the transmitted amplitude), because
the transmitted wave travels at a different speed. Show that
(2.175)
E-Vo F1²
T = E A²²¹
for E > Vo. Hint: You can figure it out using Equation 2.99, or-more
elegantly, but less informatively-from the probability current (Problem
2.18). What is T, for E < Vo?
(d) For E > Vo, calculate the transmission coefficient for the step potential,
and check that T + R = 1.
Transcribed Image Text:(c) For a potential (such as this one) that does not go back to zero to the right of the barrier, the transmission coefficient is not simply | F²/A2 (with A the incident amplitude and F the transmitted amplitude), because the transmitted wave travels at a different speed. Show that (2.175) E-Vo F1² T = E A²²¹ for E > Vo. Hint: You can figure it out using Equation 2.99, or-more elegantly, but less informatively-from the probability current (Problem 2.18). What is T, for E < Vo? (d) For E > Vo, calculate the transmission coefficient for the step potential, and check that T + R = 1.
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