The plot will display the Energy Functional vs. Energy by default. Click the pul

Question

The plot will display the Energy Functional vs. Energy by default. Click the pull-down menu and go to Band Information. From the pull-down menu, now select Allowed Bands. This shows the Band Information graphically.

Looking at the Allowed Bands plot, what do the green lines and red lines represent?

Periocic Potential Lab ?× Terminate Keep for later Simulate Potential type Enegy Details Well Geometry width of single periodic cell (A)100A Resut Energy functional vs Energy Enter the a (A) 50A 0 Efective mass of the particle (m) 0023 100 Energy (deVD Clear One Cleat All Step Potenbal PNG imag 18.5 kB Wiath of single periodic cell (A)- 100A Enter the a (A) 50 Efective mass of the particle (n).0023 Vmin

Explanation / Answer

As far as functional energy Vs energy is concerned, red line at every band gap is outside of [-1,1], therefore from plot we can conclude that it is out of band, and green line which is inside the band of [-1,1] hence it is allowed signal.

From band information chart one thing is clear, when energy of the device is increasing then band gap is decreasing. If we compare this with semiconductor and conductor material then we can find that, when temperature increases semiconductor material bandgap decreases. Same thing happening with this plot as energy (eV) is increasing, which means green signal is also getting wider and at the same time band gap is decreasing due to increasing energy, same thing we can see from band information chart.

Note- above explaination is as per plot and given information, if it is not relevant, please find me in comment box.

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