[FONT="Comic Sans MS"]The subscript 'nn' indicates nearest neighbor hopping; 'nnn' next nearest neighbor hopping. We use Kittel but the lectures on the Tight Binding Model came from Ashcroft's text. Distinctions in notation exist between the two texts. I think Ashcroft was used for this...
[FONT="Comic Sans MS"]We recently covered the tight binding model. I have a question from an early lecture regarding sign conventions for the hopping parameter t(T). It was explained that t>0 due to MO theory. I agree and understand why; orbital overlap. It was then stated that tnn<0; that...
[FONT="Comic Sans MS"]I am posting this to see if any readers/mentors, etc. can refer me to any type of reference for Rydberg states that also exhibit the quantum defect wherein we need to be concerned with the attractive force between the nucleus (or possibly, the ion core) and valence...
[FONT="Comic Sans MS"]DrDu,
Thanks again for the reference to Born & Huang. I purchased a used copy and you are correct; the subject matter receives a thorough treatment.
Rick
[FONT="Comic Sans MS"]alxm,
Thank you; I appreciate your efforts. I do know about Griffiths but do not yet own a copy; that discrepancy will be resolved soon. I'll also perform the search for adiabatic theorem to see what results it brings.
Rick
[FONT="Comic Sans MS"]alxm,
Thank you for your reply and explanation. However, I remain scratching my head regarding this because my undergraduate degree is best described as chemical physics. However, I stopped this early to begin graduate school during the fall so I was awarded a BA in...
[FONT="Comic Sans MS"]I was educated as a physical chemist so this subject is not unknown to me. However, I am currently taking a condensed matter physics course and this was presented primarily as the "adiabatic approximation." Can someone elaborate on this notion of adiabicity (i.e., S...