<jupyter_start><jupyter_text>Run the cell below by clicking on it and pressing *ctrl + enter* and enjoy the game:* Since the 2D problem is computationally more involved than the 1D, then it takes a bit slower to recalculate the band structure, that is, 1-3 seconds.* The image opens in a new window and it is possible to control it by the widgets appearing bellow* To move the 3D image use the left click of the mouse; to zoom in and out use left click and move the mouse up/down. The user icons in the figure work only for the 2D figure* The Brillouin zone is discretised to  $ 30 \times 30 $ different k-points here.<jupyter_code>%run UserInterface_2DNoPopOut.ipynb
display(ToDisplay)
fig<jupyter_output><empty_output>
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