Non-dispersive wave packets in periodically driven quantum systems
With the exception of the harmonic oscillator, quantum wave packets usually spread as time
evolves. This is due to the non-linear character of the classical equations of motion which …
evolves. This is due to the non-linear character of the classical equations of motion which …
Open shells and multi-electron interactions: core level photoionization of the 3d metal atoms
This review covers the outer core level photoionization of the free 3d metal atoms from Sc to
Cu. The experimental 3p, 3s and 2p photoemission and photoabsorption spectra are …
Cu. The experimental 3p, 3s and 2p photoemission and photoabsorption spectra are …
Chaos in the three-site Bose-Hubbard model: Classical versus quantum
We consider a quantum many-body system—the Bose-Hubbard system on three sites—
which has a classical limit, and which is neither strongly chaotic nor integrable but rather …
which has a classical limit, and which is neither strongly chaotic nor integrable but rather …
Photoionization of metastable heliumlike ions: Precision study of intermediate doubly excited states
In a joint experimental and theoretical endeavor, photoionization of metastable C 4+(1 s 2 s
S 1 3) ions via intermediate levels with hollow, double-K-vacancy configurations 2 s 2 p, 2 s …
S 1 3) ions via intermediate levels with hollow, double-K-vacancy configurations 2 s 2 p, 2 s …
Double--hole resonances in single photoionization of He-like ions
Within a joint experimental and theoretical research project, single photoionization of He-like
B 3+ ions was investigated in the energy range from approximately 250 to 1200 eV. With the …
B 3+ ions was investigated in the energy range from approximately 250 to 1200 eV. With the …
Testing Born's rule via photoionization of helium
It is shown how state-of-the-art attosecond photoionization experiments can test Born's rule--
a postulate of quantum mechanics--via the so-called Sorkin test. A simulation of the Sorkin …
a postulate of quantum mechanics--via the so-called Sorkin test. A simulation of the Sorkin …
Resonant two-photon absorption of extreme-ultraviolet free-electron-laser radiation in helium
M Nagasono, E Suljoti, A Pietzsch, F Hennies… - Physical Review A …, 2007 - APS
We have investigated the nonlinear response of helium to intense extreme-ultraviolet
radiation from the free-electron laser in Hamburg (FLASH). We observe a spectral feature …
radiation from the free-electron laser in Hamburg (FLASH). We observe a spectral feature …
Frequency dependence of the exact exchange-correlation kernel of time-dependent density-functional theory
M Thiele, S Kümmel - Physical Review Letters, 2014 - APS
We present a scheme for numerically reconstructing the exact and the Kohn-Sham time-
dependent density-density response functions, and from their inverse the numerical …
dependent density-density response functions, and from their inverse the numerical …
Integrable matrix theory: Level statistics
JA Scaramazza, BS Shastry, EA Yuzbashyan - Physical Review E, 2016 - APS
We study level statistics in ensembles of integrable N× N matrices linear in a real parameter
x. The matrix H (x) is considered integrable if it has a prescribed number n> 1 of linearly …
x. The matrix H (x) is considered integrable if it has a prescribed number n> 1 of linearly …
Resonance parameters of autoionizing Be states
R Wehlitz, D Lukić, JB Bluett - Physical Review A, 2003 - APS
We have employed monochromatized synchrotron radiation to measure the Be+ ion yield in
the photon energy region of the Be 2 pnl (n= 3–1 2) double excitations. The energy positions …
the photon energy region of the Be 2 pnl (n= 3–1 2) double excitations. The energy positions …