Electron in a triangular quantum well with triangular barrier

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SUMMARY

The discussion focuses on solving the problem of an electron in a triangular quantum well with a triangular barrier. Participants emphasize the necessity of solving the time-independent Schrödinger equation to obtain energy eigenvalues and wavefunctions. Key calculations involve integrating the square of the wavefunction to determine the probability density distribution, which should equal one. Recommended tools for coding these solutions include MATLAB and Python, which provide built-in functions for these quantum mechanics calculations.

PREREQUISITES
  • Understanding of the Schrödinger equation
  • Familiarity with quantum mechanics concepts, specifically quantum wells
  • Proficiency in MATLAB or Python programming
  • Knowledge of probability density functions
NEXT STEPS
  • Study the time-independent Schrödinger equation in detail
  • Learn how to define potential energy profiles for quantum wells
  • Explore MATLAB functions for solving differential equations
  • Investigate Python libraries such as NumPy and SciPy for numerical solutions
USEFUL FOR

Students and researchers in quantum mechanics, physicists working on semiconductor physics, and developers interested in computational modeling of quantum systems.

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Moved from a technical forum, so homework template missing
Hi, it's been so long since I learned quantum mechanics. So the only thing I can solve now is the square quantum well problem.
But I need help because I have to solve this problem of quantum well.

KakaoTalk_20191023_122535839.png

I tried some calculation but not far.I try to draw the capacitance-voltage profile by drawing the probability distribution when the electron is in the quantum well in the figure, and by finally calculating the variation of external electric field.
Is ∫|ψ|^2dx =1 in well?
How do I get started and how do I code my programs?

I really don't remember anything at all... I'm sorry for the lack of context in this questions.
 
Physics news on Phys.org
The square quantum well problem is a classic example of a one-dimensional quantum system. It models the motion of an electron confined to a region of space (the quantum well) with certain boundary conditions. The solution of this problem involves solving the Schrödinger equation and obtaining the energy levels and wavefunctions of the electron in the quantum well. To solve this problem, you need to start by defining the potential energy inside the quantum well, which is typically a piecewise constant function. You then need to solve the time-independent Schrödinger equation for this potential energy profile to get the energy eigenvalues and wavefunctions for the electron in the quantum well. Once you have obtained the wavefunctions, you can calculate the probability density distribution and the capacitance-voltage profile of the quantum well using the wavefunctions. To do this, you need to integrate the square of the wavefunction over the region of the quantum well. This integral should indeed be equal to one.If you are having difficulty coding up the solution to this problem, you could consider using a software package such as MATLAB or Python that has built-in functions for solving the Schrödinger equation and calculating the wavefunctions and probability density distributions.
 

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