Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-50441
Leuenberger, D; Yanagisawa, H; Roth, S; Osterwalder, J; Hengsberger, M (2011). Disentanglement of electron dynamics and space-charge effects in time-resolved photoemission from h-BN/Ni(111). Physical Review B, 84(12):125107.
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We observe time-resolved and polarization dependent two-, three-, and four-photon transitions from a Ni(111) surface covered with a monolayer of hexagonal boron nitride. The spectra show features due to transitions involving two unoccupied intermediate states: the n=1 image potential state of Ni(111) and a boron nitride-related interface state. We use these transitions in order to track the effects of space-charge on the spectra in view of pump-probe experiments, at high excitations densities. A simple model is presented, which reproduces the measured energy shifts and broadenings in great detail, allowing the ultrafast dynamics and the space-charge effects to be disentangled. Moreover, owing to the high excitation densities an additional particular three-photon transition via both the interface state and a virtual intermediate state could be measured and identified. The polarization-dependent transient of this transition has successfully been simulated, allowing the lifetime of the involved intermediate state to be extracted from the data.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Physics Institute|
|Deposited On:||31 Oct 2011 14:01|
|Last Modified:||01 Dec 2013 01:57|
|Publisher:||American Physical Society|
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