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Ultrafast dynamics of excitons in delafossite thin films
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View: Figures


Image of FIG. 1.
FIG. 1.

Absorption spectrum (closed circles) at 80 K for a thin film grown on a SCAM substrate. Also shown are the result of fit (solid curve), composed of exciton discrete levels (dashed curve) and its continuum (dotted curve). Energies of exciton peak , band gap , pump, and probe are shown. A horizontal bar indicates the probe energy range for which time traces were taken, while downward arrows correspond to energy positions of those adopted in Fig. 2. The inset shows a crystal structure of .

Image of FIG. 2.
FIG. 2.

Measured (open circles) and calculated (solid curves) transient differential transmission at different probe energies of 4.132 (top), 3.873 (middle), and 3.755 eV (bottom). The traces are offset for clarity, the baselines of which are shown by dashed lines. The rising and decay time constants are indicated on each curve.

Image of FIG. 3.
FIG. 3.

(a) Inverted differential transmission spectrum (solid squares) at a time delay with a calculated result (solid curve). (b) The steady-state absorption. (c) Spectral distribution of the decay time constant (solid squares) derived from exponential function fit to the experimental data. Parentheses were attached for data, the precision of which are not sufficient due to weak signal. The dashed line corresponds to a lifetime of exciton used in the calculation based on Eq. (1).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultrafast dynamics of excitons in delafossite CuScO2 thin films