Kronig-Penney model and formation of energy bands

  1. Initialize the Simulation:

    o Open the simulation interface in your web browser. You will see a graphical canvas along with sliders for adjusting the potential depth and lattice spacing.
  2. Adjust Parameters:

    o Use the Potential Depth Slider to set the depth of the potential wells. As you move the slider, the value displayed next to it will update accordingly.
    o Use the Lattice Spacing Slider to adjust the distance between potential wells. This will also update the value displayed next to the slider.
  3. Visualize the Periodic Potential:

    o The simulation will automatically display the periodic potential wells as green vertical lines or rectangular barriers on the canvas.
    o Observe how the potential wells are structured and how they repeat across the canvas.
  4. Analyze Energy Bands:

    o The simulation will draw horizontal blue lines to represent energy bands. These lines indicate the allowed energy levels for electrons within the periodic potential.
    o Notice how the number and position of these bands change with different potential depth and lattice spacing settings.
  5. Examine Electron Wavefunctions:

    o The simulation will also display electron wavefunctions as red sine waves. These curves show how electrons behave within the potential wells.
    o Adjust the sliders to see how changes in potential depth and lattice spacing affect the wavefunctions.
  6. Explore the Effects of Parameter Changes:

    o Modify the potential depth and lattice spacing using the sliders to explore their effects on the energy bands and wavefunctions.
    o Observe how increasing or decreasing these parameters alters the formation of energy bands and the characteristics of electron wavefunctions.
  7. Draw Conclusions:

    o Based on your observations, analyze how the periodic potential influences the energy bands and wavefunctions.
    o Relate your findings to concepts such as band gaps, the behavior of conductors, semiconductors, and insulators.
  8. Document Your Findings:

    o Take notes on how different parameter values affect the system. Pay attention to any patterns or insights you gain about the relationship between the periodic potential and electronic properties.