Posted by Pseudonym on March 24, 2013, 6:28 pm
In the bottom paragraph of the page in the qualitative description of the perturbation shift you say that t is the amplitude for hopping, is this correct, if it is then the last term in the equation above it has units of per energy (I think) also, given the numerator in 2nd order perturbation theory is a mod squared where is the minus sign coming from after the equality? Cheers 
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