Transmission of a TWO step potential

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SUMMARY

The discussion focuses on evaluating the transmission coefficient for an incident wave encountering a two-step potential defined by V(x) with regions V1 and V2, where 0 < V1 < V2 and E > V2. The transmission coefficient T is calculated using the formula T = 4k0k1 / ((k0 + k1)^2). The presence of two boundary conditions significantly influences the wavefunction and the resulting transmission, as the wave interacts with both potential steps, leading to reflections at each boundary.

PREREQUISITES
  • Understanding of quantum mechanics, specifically wavefunctions and potential barriers.
  • Familiarity with the concept of transmission coefficients in quantum mechanics.
  • Knowledge of boundary conditions and their impact on wave behavior.
  • Basic proficiency in solving differential equations related to quantum systems.
NEXT STEPS
  • Study the derivation of the transmission coefficient for multiple potential barriers.
  • Learn about the implications of boundary conditions on wavefunctions in quantum mechanics.
  • Explore the mathematical techniques for solving Schrödinger's equation in piecewise potential scenarios.
  • Investigate the physical interpretations of reflection and transmission in quantum tunneling.
USEFUL FOR

Students and professionals in quantum mechanics, particularly those studying wave-particle interactions and potential barriers, will benefit from this discussion.

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Homework Statement


Consider the potential:
V(x)
=0 x<0
=V1 0<x<a
=V2 x>a

Where 0<V1<V2 and E>V2

Evaluate the transmission coefficient for the incident wave into the region x>a


Homework Equations


T= 4k0k1/((k0+k1)^2)


The Attempt at a Solution


I have not attempted this. It seems pretty straight forward if there were only ONE step. How does the fact that there are two steps factor into the answer?

Thank you.
 
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You will have 2 boundary conditions which can affect your answer. Since a wave traveling from the far left will interact with both of them, and some of it will reflect back at both steps.

Just solve for the wavefunction with the 2 BC's, and solve for the transmission the way you usually do after that.
 

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