[Pw_forum] negative e-ph coupling constant lambda(q)

陳 少華 chen_shao_hua197 at yahoo.com.tw
Fri Mar 23 20:29:01 CET 2007

Dear members,
The e-ph coupling constant lambda(q) should be >= 0 by
its definition.
So if we get the negative lambda(q) by example07
steps,does it mean the material structure unstable ?
(just like get negative freqency )

Best Regards

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