Control of photoemission delay in resonant two-photon transitions
Entity
UAM. Departamento de QuímicaPublisher
American Physical SocietyDate
2017-04-26Citation
10.1103/PhysRevA.95.043426
Physical Review A 95.4 (2017): 043426
ISSN
1094-1622 (online); 1050-2947 (print)DOI
10.1103/PhysRevA.95.043426Funded by
We thank M. Dahlström, P. Salières, E. Lindroth, J. Burgdörfer, and R. Pazourek for useful discussions. We acknowledge computer time from the CCC-UAM and Marenostrum Supercomputer Centers and financial support from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC Grant agreement 290853 XCHEM, the MINECO Projects FIS2013-42002-R and FIS2016-77889-R, and the European COST Action XLIC CM1204. L.A. acknowledges support from TAMOP NSF Grant No. 1607588, as well as UCF fundings. A.M., J.C., and R.T. acknowledge financial support from the Agence Nationale de la Recherche through the program ANR-15-CE30-0001-01-CIMBAAD. A.J.G. acknowledges support from DFG QUTIF Grant IV 152/6-1Project
info:eu-repo/grantAgreement/EC/FP7/290853; Gobierno de España. FIS2013-42002-R; Gobierno de España. FIS2016-77889-R; info:eu-repo/grantAgreement/EC/FP7/321971Editor's Version
http://dx.doi.org/10.1103/PhysRevA.95.043426Subjects
Coulomb functions; Energy derivatives; One photon absorption; Photo-electron emission; QuímicaRights
© 2017 American Physical SocietyAbstract
The photoelectron emission time delay τ associated with one-photon absorption, which coincides with half the Wigner delay τW experienced by an electron scattered off the ionic potential, is a fundamental descriptor of the photoelectric effect. Although it is hard to access directly from experiment, it is possible to infer it from the time delay of two-photon transitions, τ(2), measured with attosecond pump-probe schemes, provided that the contribution of the probe stage can be factored out. In the absence of resonances, τ can be expressed as the energy derivative of the one-photon ionization amplitude phase, τ=∂EargDEg, and, to a good approximation, τ=τ(2)-τcc, where τcc is associated with the dipole transition between Coulomb functions. Here we show that, in the presence of a resonance, the correspondence between τ and ∂EargDEg is lost. Furthermore, while τ(2) can still be written as the energy derivative of the two-photon ionization amplitude phase, ∂EargDEg(2), it does not have any scattering counterpart. Indeed, τ(2) can be much larger than the lifetime of an intermediate resonance in the two-photon process or more negative than the lower bound imposed on scattering delays by causality. Finally, we show that τ(2) is controlled by the frequency of the probe pulse, ωIR, so that by varying ωIR, it is possible to radically alter the photoelectron group delay
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Google Scholar:Argenti, L.
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Jiménez-Galán
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Caillat, J.
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Taïeb, R.
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Maquet, A.
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Martín García, Fernando
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