Imaging electron motion with attosecond time resolution
Imaging electron motion with attosecond time resolution
Imaging electron motion with attosecond time resolution
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Frenkel vs. Wannier in <strong>time</strong>-domain IXS<br />
Wannier’s Excitonic Basis:<br />
| R, R + β ><br />
Excitons come from diagonalizing<br />
∑<br />
K<br />
ββ ′<br />
′<br />
R<br />
−i<br />
⋅R<br />
H ( K) = e < R, R + β | H | 0, β ><br />
For Frenkel exciton, dominated by one term:<br />
∑<br />
K<br />
R<br />
( ) −i<br />
⋅R<br />
H , | | 0,0<br />
00<br />
K = e < R R H ><br />
Conclusion: Frenkel exciton keeps its size / shape through its life. Wannier<br />
changes. Inverted IXS directly sensitive to Wannier vs. Frenkel vs.<br />
intermediate descriptions.
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