I have a question... in a simple system of two bands with Fermi level at zero. Then, one band goes up and the other band goes down without the two of them touch each other (meaning indirect closing of the gap and therefore a change in the occupation) can we still define the Zak phase?.
May I please ask this question: You said this in the beginning of the lecture 2:12: 'If we look at the data of the longitudinal magnetoresistance we see that it is an insulator. On all these plateaus we see these regions where the resistance is zero, so that fits with our previous definition (of an insulator)...' An insulator has a big resistance. Please, could you explain this statement of yours? Thank you in advance. I understand that the question is silly:) I just want to get to know this topic.
It's not a silly question, it's actually an important point(!) An explanation is in this channel's video "TMS19 Steve Simon: Intro to integer and fractional QHE (I)" around minute 8:40
Amazing lecture!
Awesome lecture! Linked together a lot of my piecewise knowledge
very nice and clear presentation. thanks a lot.
cap, most difficult thing ever. She explained it like she had to little time
Really great talk, super clear, thank you!
I have a question... in a simple system of two bands with Fermi level at zero. Then, one band goes up and the other band goes down without the two of them touch each other (meaning indirect closing of the gap and therefore a change in the occupation) can we still define the Zak phase?.
May I please ask this question:
You said this in the beginning of the lecture 2:12:
'If we look at the data of the longitudinal magnetoresistance we see that it is an insulator. On all these plateaus we see these regions where the resistance is zero, so that fits with our previous definition (of an insulator)...'
An insulator has a big resistance. Please, could you explain this statement of yours? Thank you in advance.
I understand that the question is silly:) I just want to get to know this topic.
It's not a silly question, it's actually an important point(!) An explanation is in this channel's video "TMS19 Steve Simon: Intro to integer and fractional QHE (I)" around minute 8:40