Electrons traversing a Potential well

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SUMMARY

The discussion centers on the behavior of electrons traversing a potential well, specifically examining the transmission coefficients for electrons approaching from both directions in a one-dimensional potential well scenario. It concludes that if the potential well is symmetric, the transmission coefficients for electrons arriving from negative infinity and positive infinity should be equal due to the parity symmetry of the Hamiltonian. However, if the potential well is not symmetric, this equality does not hold, indicating that the direction of approach affects the transmission coefficient.

PREREQUISITES
  • Understanding of quantum mechanics principles, particularly wave-particle duality.
  • Familiarity with potential wells and their mathematical representations.
  • Knowledge of Hamiltonian mechanics and symmetry operations.
  • Basic grasp of transmission coefficients in quantum tunneling scenarios.
NEXT STEPS
  • Study the mathematical formulation of potential wells in quantum mechanics.
  • Explore the concept of parity symmetry in quantum systems.
  • Investigate the implications of asymmetric potential wells on electron transmission.
  • Learn about quantum tunneling and its applications in semiconductor physics.
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Students and professionals in physics, particularly those focusing on quantum mechanics, as well as researchers exploring electron behavior in potential wells and related quantum phenomena.

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Let's imagine an electron that lives in an one dimensional world where there is a potential well near x=0 and that for x=+inf or -inf the electron is free.
Is there any relation between the transmission coefficient of an electron arriving at the well coming from x=-inf and the transmission coefficient for another electron traversing the other way?
Should they be equal?
 
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If the potential well is symmetric, then it means the entire Hamiltonian is symmetric under parity (space reversal). So there's nothing in the description of the system that could allow the electron to know which direction it's coming from. In that case, the coefficient of transmission should be the same either way.
 
it is not symmetric
 

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