Mod-03 Lec-32 E Vs k, Brillouin Zones and the Origin of Bands

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1. What causes direct and indirect bandgaps to occur?
2. You Sir ARE A GENIUS. THANK YOU THANK YOU THANK YOU
3. its relly excellent lecture
4. Excellent lecture Sir. One of the best. Explains many concepts. Thank you for your effort.
5. This is a spectacular lecture! Thank you for clearly explaining many key points that other professors and text books often fail at. I also have a question for you. Why can the origin in reciprocal space be located at any reciprocal lattice vector? If a wave function has a wave vector equal to any reciprocal lattice vector, does it have an energy of 0?
6. You, sir, are a genius. Thank you!
7. Dear All, An online course based on the videos of Physics of Materials
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8. Thank you so much for making this video. This has helped clear a lot of things up for me!
9. Thank you so much great explanation!
10. Thank you very much sir for uploading this...
11. Thank you so much for such a wonderful explanation of the topic.
12. Respected Sir, it was an awsome lecture.......Thank you for such an awsome lecture
13. Best lecture found on the internet for E-k diagram and Brillouin Zones! Thank you NPTEL
14. Wonderful lecture !!! Thank you very much!!!
15. This was very informative and concise! Thank you for such a great lecture.
16. Muy claro  excelente 
17. Dear Prof. Haridoss, Thanks for your excellent and clear presentation.
18. Very good lecture ...
19. Haven't logged in for a while, just logged in because I have to express my gratitude to Dr Haridross for such clear and visual explanation. I learned more in this lesson than in the last month in my solid state physics course. I look forward to watching your other videos.
20. Great presentation...very good, very clear. I clarified confusing issues I had for months. Keep up!