[Todos] Coloquios del Departamento de Física, jueves 21/3, 14 hs. Control of attosecond entanglement and coherence. Marc Vrakking. Max-Born Institute (MBI), Berlin

[Ariel Chernomoretz]

Coloquios del Departamento de Física
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 2023.