[Todos] Coloquios del Departamento de Física. Recordatorio. Hoy jueves 21/3, 14 hs, "Control of attosecond entanglement and coherence" por el Dr. Marc Vrakking

[Marcelo Javier Otero]

 Coloquios del Departamento de Física
Recordatorio, hoy, jueves 21/3, 14 hs.
Aula Federman - Primer Piso - Pabellón 1 - Ciudad Universitaria - CABA.

Tenemos el agrado de invitarles a la primera charla del ciclo de Coloquios
2024 de nuestro departamento. En esta oportunidad, recibiremos al Dr. Marc
Vrakking, que nos hablará de:

"Control of attosecond entanglement and coherence"

Attosecond science is a branch of ultrafast laser physics that aims to
investigate and possibly control electronic motion on its natural timescale
by means of pump-probe experiments. Attosecond pulses are formed by the
process of high-harmonic generation. Their generation and characterization
were recently recognized by the 2023 Physics
Nobel Prize, which was given to Anne L’Huillier, Pierre Agostini and Ferenc
Krausz.
Attosecond pulses have wavelengths in the extreme ultra-violet (XUV) to
soft X-ray spectral range. Accordingly, attosecond pulses are ionizing
radiation for any medium (solid, liquid or gaseous) that is placed in its
path. Photoionization splits a quantum system under investigation into an
ion and a photoelectron. The ion and photoelectron will commonly display
quantum- mechanical entanglement, which influences the coherence that
attosecond pump-probe experiments rely on. In my talk I will discuss
experimental and numerical work demonstrating the role of ion-photoelectron
entanglement in attosecond pump-probe experiments, by taking as an example
the vibrational and
electronic wavepacket dynamics that is induced in H2+ cations upon
ionization of H2 by an attosecond laser pulse.
I will show how tailoring the properties of the attosecond pulses (i.e.
forming a pair of these pulses, or chirping these pulses) can be used to
control the degree of ion-photoelectron entanglement that occurs, as
indicated by the degree of vibrational, respectively electronic coherence
that can be observed in the ion. In the calculations, the conclusions are
furthermore supported by evaluation of the purity and a Schmidt
decomposition of the ion + photoelectron wavefunction that results from the
ionization process.

Les esperamos.
(Recuerden traer su propia taza para el café)

Comisión organizadora de los coloquios del DF 2024.
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