Sensitivity of nonlinear photoionization to resonance substructure in collective excitation

T. Mazza, A. Karamatskou, M. Ilchen, S. Bakhtiarzadeh, A. J. Rafipoor, P. O’Keeffe, T. J. Kelly, N. Walsh, J. T. Costello, M. Meyer () and R. Santra ()
Additional contact information
T. Mazza: European XFEL GmbH
A. Karamatskou: Center for Free-Electron Laser Science, DESY
M. Ilchen: European XFEL GmbH
S. Bakhtiarzadeh: European XFEL GmbH
A. J. Rafipoor: European XFEL GmbH
P. O’Keeffe: CNR Istituto di Struttura della Materia, CP10
T. J. Kelly: School of Physical Sciences and NCPST, Dublin City University
N. Walsh: School of Physical Sciences and NCPST, Dublin City University
J. T. Costello: School of Physical Sciences and NCPST, Dublin City University
M. Meyer: European XFEL GmbH
R. Santra: Center for Free-Electron Laser Science, DESY

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Collective behaviour is a characteristic feature in many-body systems, important for developments in fields such as magnetism, superconductivity, photonics and electronics. Recently, there has been increasing interest in the optically nonlinear response of collective excitations. Here we demonstrate how the nonlinear interaction of a many-body system with intense XUV radiation can be used as an effective probe for characterizing otherwise unresolved features of its collective response. Resonant photoionization of atomic xenon was chosen as a case study. The excellent agreement between experiment and theory strongly supports the prediction that two distinct poles underlie the giant dipole resonance. Our results pave the way towards a deeper understanding of collective behaviour in atoms, molecules and solid-state systems using nonlinear spectroscopic techniques enabled by modern short-wavelength light sources.

Date: 2015
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DOI: 10.1038/ncomms7799

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