International workshop on theory for attosecond quantum dynamics (IWTAQD) 24

 


supported in part by World Research Unit (B-1) of Reaction Infography (R-ing) at Nagoya University



Mar 11 (online)
Please join via the link in the message of IWTAQD24 Confirmation.
The zoom session will be opened 20 min before the 1st talk.




back to IWTAQD page

Participants

Oleg I. Tolstikhin MIPT
 Adiabatic Theory, Tunneling ionization
 Mar 11, 2022
Hans Jacob Wöner ETH
 Atto-sec science, experimrnt
 Mar 11, 2022
Han Meng ETH
 Atto-sec science, experimrntv Mar 11, 2022



Mar 11, 2022
Akiyosi Hishikawa
 Nagoya U
 Co-Chair, Molecular tunneling ionization experiment
 Mar 11, 2022
Mizuho Fushitani
 Nagoya U FEL expeiment
 Mar 11, 2022
Keiko Kato
 Nagoya U HHG experiment
 Mar 11, 2022




Shun Ohgoda
 ANRITSU CORPORATION Adiabatic theory for X+IR
 Mar 11, 2022
Yuichiro Saito
 UEC
 Numerical calc.
 Mar 11, 2022
Hirokazu Matsui
 UEC
 Siegert states in rotating frame
 Mar 11, 2022
Takahiro Harima
 UEC
 Molecular dynamics
 Mar 11, 2022
Yoshitada Yasuda
 UEC
 Molecular dynamics Mar 11, 2022
Shinichi Watanabe
 UEC
 Professor emeritus, International Student Center, Head
 Mar 11, 2022
Michio Matsuzawa
 UEC
 Professor emeritus
 Mar 11, 2022
Yasunori Yamazaki
 RIKEN/U Tokyo
 Anti Matter
 Mar 11, 2022
Tomoyuki Endo
 QST
 Strong field experiment
 Mar 11, 2022
Akitaka Matsura
 Nagoya U
 Strong field experiment Mar 11, 2022
Chiennan Liu
 Fu-jen catholic U
 Strong field theory
 Mar 11, 2022
Mizuho Fushitani
 Nagoya U Strong field experiment Mar 11, 2022
Kirill Bazarov
 MIPT
 Strong field theory Mar 11, 2022
Vsevolod Avrutsjiy
 MIPT
 Strong field theory Mar 11, 2022




Toru Morishita UEC Chair Mar 11, 2022



Workshop Program (tentative)

Mar 11  (Fri) 2022

Face-to-face (Bldg. East-6, Rm 803) & Online (zoom) session  Time is in JST (UTC+9000)

Please register in advance for this meeting:
https://us02web.zoom.us/meeting/register/tZwocemtrDwpGd384ckgA8VJUxrgwXhlZ4ay

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16:20-16:40  FREE DISCUSSION (please check connection/sharing screen during this time
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Chair, T. Morishita

16:40-17:05  Oleg I. Tolstikhin (MIPT)
"Strong-field physics with vortex electrons"
Abstract:
Vortex electrons open new perspectives in strong-field physics.Some scenarios of how to generate vortex electrons, manipulate them, and
use them for target structure imaging will be discussed.

17:05-17:30 Han Meng (ETH)
"Attosecond metrology in circular polarization"
Abstract:
Attosecond metrology with linearly polarized light pulses is well developed and broadly applied. In contrast, the generation, characterization and applications of circularly polarized attosecond pulses are still in their infancy, in spite of their considerable promise for studying chiroptical phenomena on the electronic time scale. Although important progress has recently been made, a general and readily accessible protocol for circular attosecond metrology is still missing. In this talk, I will introduce our recent progress on characterization of the temporal structure of the circular attosecond pulses based on a new technique that integrates the concepts of angular streaking with those of two-color (XUV/IR) interferometry known as RABBIT. We show that this technique encodes the attosecond-metrology information into the photoemission angle in the polarization plane, which removes the need to scan the time delay between XUV and IR pulses. We apply this new metrology to characterize amplitude and phase dichroisms in the creation and manipulation of photoelectron vortices.

17:30-17:55 Keiko Kato (Nagoya U)
"Time-resolved observation of Fano resonance in p-type Si"
Abstract:
Through time-resolved observation of ultrafast carrier and phonon dynamics in p-type Si, we derived a full description of a Fano parameter as a function of time-domain parameters. We observed a fast decay of inter-valence band transitions, and slow decay of optical phonons, which respectively correspond to the continuum and discrete states. The experimental results revealed that the initial phase of the discrete state and the ratio of the relative transition amplitude between the discrete and continuum states affect the Fano asymmetry parameter. The present study suggests the way how the Fano asymmetry parameter could be controlled by the time-domain parameters.

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17:55-18:10 BREAK
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Chair, A. Hishikawa

18:10-18:35 Hans Jacob Wöner (ETH)
"Attosecond soft-X-ray spectroscopy of charge migration and conical-intersection dynamics"
Abstract:
Attosecond charge migration is a periodic evolution of the charge density of a molecule on a time scale defined by the energy intervals between the electronic states involved. In this talk, I will described the observation of charge migration in neutral silane (SiH4) in 690 as, its decoherence within 15 fs, and its revival after 40-50 fs using X-ray attosecond transient absorption spectroscopy [doi.org/10.48550/arxiv.2110.00357]  . The migration of charge is observed as pairs of quantum beats with a characteristic spectral phase in the transient spectrum. The decay and revival of the degree of electronic coherence is found to be a result of both adiabatic and non-adiabatic dynamics in the populated Rydberg and valence states. The experimental results are supported by fully quantum-mechanical ab-initio calculations that include both electronic and nuclear dynamics. We find that conical intersections can mediate the transfer of electronic coherence from an initial superposition state to another one involving a different lower-lying state. Operating on neutral molecules, our methods define a general approach to the key phenomena underlying attochemistry.


18:35-19:00 Shun Ohgoda (UEC)
 "Photoelectron momentum distribution of an atom generated by a combination of XUV and IR pulses "
Abstract:
An electron emitted from an atom by a weak XUV pulse can be deflected by a strong IR field. For a longer wavelength and a higher intensity of IR pulse, most of the emitted electrons just follow the IR pulse. But a part of an electron can be rescattered by the parent ion, which causes interference fringe in photoelectron momentum distribution (PEMD). In this work, we study this interference fringe in the PEMD obtained by numerically solving the time-dependent Schrödinger equation. We extract the phase of the scattering amplitude for forward rescattering of an ionized electron from an interference fringe using the adiabatic theory [O. I. Tolstikhin, and T. Morishita, Phys. Rev. A 86,043417 (2012)]. The extracted phase of the scattering amplitude is in good agreement with the scattering calculation. In this talk, we present the base of the interference fringe analyzed by the adiabatic theory as well as some of the illustrative results for different intensities of IR pulse, which allow us to scan different ranges of the phase of the scattering amplitude.

19:00-19:25 Mizuho Fushitani (Nagoya U)
"Electron-electron-ion coincidence experiments on nonlinear ionization of Xe atoms with intense EUV laser pulses"
Abstract:
Nonlinear multiple ionization processes of Xe induced by free-electron laser pulses in the extreme ultraviolet (EUV) region were investigated by multielectron-ion coincidence spectroscopy. Extraction of the weak nonlinear electron signals correlated with higher charged ions allows us to identify nonlinear ionization pathways in a channel-resolved manner. We will discuss the ionization mechanism, placing emphasis on the role of inner-shell electrons.

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19:25-  FREE DISCUSSION  Let's have a chat. Bring food/drink, please.
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Toru Morishita,UEC