The Holstein polaron: results from numerical and analytical ... - PiTP
The Holstein polaron: results from numerical and analytical ... - PiTP
The Holstein polaron: results from numerical and analytical ... - PiTP
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Since G(k,w) is a sum of diagrams, keeping the correct no. of diagrams is extremely important!<br />
found correctly if n=0 diagram kept correctly dominates if t >> g, λ 0<br />
found correctly if we sum correct no. of<br />
diagrams dominates if g >>t, λ >>1
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