Band structure (contd.) and Fermi-Dirac distribution

[@abhijitghosh6242]

Fantastic lecture, thank you professor Finally I understand the beauty of semiconductor

[@mytreyak]

35:49 if you are wondering how at T= 0K for Ei

[@bagadivenkatramesh9046]

But why should we calculate it that way?

[@cidletsgo3298]

@mytreya kasturi.... thank you 🙂

[@mdshahidansari9126]

Sir it is because of you we understood all these topics otherwise it would have been impossible

[@vathsalmehta3488]

You are a savior ,I was finding a course very much like this not involving complex quantum mechanics and maths

[@UsamaThakurr]

Would you please tell me where are those lectures that involves Quantum Mechanics and Mathematics more that's what I am looking for. Thank you

[@harlankingston841]

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[@justiceelias9237]

@Harlan Kingston instablaster :)

[@harlankingston841]

@Justice Elias Thanks for your reply. I found the site through google and I'm waiting for the hacking stuff atm. I see it takes a while so I will get back to you later when my account password hopefully is recovered.

[@harlankingston841]

@Justice Elias it worked and I actually got access to my account again. I'm so happy! Thank you so much, you saved my ass!

[@udaytewary3809]

Really thankyou sir ❤️❤️❤️❤️ for this amazing lecture and this really help me to visualise the Fermi level and probability concept like never before

[@deepankarsarmah8208]

Very nicely explained. Thank you for this

[@saralashanthi.j9258]

Excellent Crystal Clear Session

[@dr.md.humaunkabir7441]

Great, professor.

[@mdaliakbar9867]

Thank you, Dr. Nath

[@Prince-fz6yo]

Sir please rename the lectures with its real topic name...it 'll be easier to get a specific topic easily from all lectures...by looking at names we r not able to recognise the actual lecture we need !

[@vinayjjachar3365]

nice concepts..sir thank you.

[@markapuramkarthik8961]

ffantabulous lecture can you tell analog electronics like this sir it will be very helpful

[@louerleseigneur4532]

Awesome

[@subarnamondal3787]

Excellent

[@ashwanipushpjivi47]

your every word is very clear , thank you very much sir

[@Arjuna_insync]

have you made the class notes ?

[@sahibhasan7095]

Thank you so much

[@Arjuna_insync]

hey have you made the class notes ?

[@markapuramkarthik8961]

superb sir

[@navdeepbedibedi360]

Thanku sir 🤗🙏

[@saralashanthi.j9258]

Inspiring , Aesthetics of Semiconductor Physics.

[@harshinibaggam7662]

Why E-K diagram of holes have separate branches where as electrons don't

[@harshinibaggam7662]

@Shravanee thank you

[@theunknown43]

Holes will be moving continuously towards right side in the V.B Where as electrons don't do. Since they r moving contiously their momentum will change contiously. So here by the e-k diagram for holes has many branches.

[@harshinibaggam7662]

thank you@@theunknown43

[@ParminderKaur-zm4kw]

@@theunknown43 electrons also move in conduction band when e. F is applied and at same time holes move in VB.. Rightt??

[@jyotiranjansahoo3791]

what are these states at given energy?

[@SouravMondal-zx7ds]

25:39

[@alanjoy7915]

Nice lecture

[@sumanth1444]

how come a lot of electrons exist in the same energy state....? usually no 2 electrons have same energy states right...

[@shubhayansarkhel4363]

here that particular energy state splitted in a continum manner and those discrete energy levels create energy band what you are talking about is true for 1s, 2s state , but after spliting they (those energy state ) no longer exist.

[@chinmaykulkarni237]

May be they indeed do not have the same energy state. Remember that here we are only talking about the probability of finding those electrons by classifying them in the same energy state. Am I making sense ?

[@rayhan8701]

But nptel karmalkar sir told that energy band diagram is not to scale

[@kothapalliavinashkumar8699]

Hloo sir electrons are also moving in valence band along with holes. isn't it

[@sanitparashar8381]

We model the movement of multiple electrons by saying that a hoke exists and it moves this way. U only have to take one. That's why holes are quasi particles. If u say both holes and electrons move u treat them both as real particles which is not possible

[@akamalahmedgadi7111]

How is k=0 possible in E k diagram,as for k=0 lambda needs to be infinite?

[@notnemeziz]

k is momentum...which can be 0.....also lambda can be infinite since here lambda corresponds to reciprocal space (Fourier transformation of real space)....hence if there is no real space then k=0

[@Neeraj-is1jt]

K cannot be exactly zero we only take values which is very close to zero. If k becomes exactly zero it will violate the uncertainty principle

[@user-mp3lb5ew2b]

if the mass of electron is not same as hole then how the hole move because hole is heavier than elec.

[@Neeraj-is1jt]

Did u get the answer?

[@rajuranjan8798]

4th lecture

[@Abhishek-cw4jn]

13:00

[@Arjuna_insync]

hey have you made the class notes ?

[@Upgradezz]

Shoddy

[@sainani8271]

Sir, can you explain how holes can get the mass. We are saying hole is absence of electron then how it will get specific mass.

[@b_40_princekumargupta51]

Holes are created due to absence of electron. When electron moves to CB he leaves an empty space in VB that empty space we call Holes.....now when we apply Electric Field say in the Right hand direction then electron are try to move in left direction and they fell the free space which we are calling holes means holes are nothing but electrons that's why holes have mass.....There is nothing called holes in any atom we are just name the empty space which was created by electron when he moves to CB and empty space we called it holes for our understanding this empty space is filled by electron during there motion when we apply EF.......So conclusion holes are nothing but electrons see 4:20

[@Neeraj-is1jt]

holes are just the absence of electron can u plz tell why there effective mass are different ?

[@livininamatrix]

How is he saying probability of finding electrons is 50% when it's clearly 100% according to the diagram?

[@Arjuna_insync]

hey have you made the class notes ?