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Why can interactions be neglected for the Integer Quantum Hall effect?

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Though the statement is made often, I've not seen any justification for neglecting electron-electron (Coulumb) interactions in the fully filled $\nu =1$ IQH state. I would highly appreciate if someone could provide an argument for the same.

Also, I don't have a background in solid-state physics, maybe I'm missing something obvious?

This post imported from StackExchange Physics at 2014-04-24 02:35 (UCT), posted by SE-user Siva

asked Nov 22, 2013 in Theoretical Physics by Siva (720 points) [ no revision ]

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