International workshop on theory for attosecond quantum dynamics (IWTAQD) 15



 June 13 - Jul 12, 2016


Direction to UEC: English, Japanese
Narita to UEC: English

back to IWTAQD page




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Participants (Bldg. E-6, Rms. 525, 527)

Oleg I. Tolstikhin MIPT
 Adiabatic Theory, Tunneling ionization
 Jun 13 -Jul 2, 2016
Chiennan Liu Fu-jen catholic U He dynamics under FEL Jun 30 - Jul 12, 2016
Akiyoshi Hishikawa Nagoya U FEL, Molecular dynamics
 Jun 20-21, 2016
Toshiyuki Azuma
 RIKEN
 Laser-Atom dynamics
 Jun 21, 2016
Trinh Hoai Vinh RIKEN Attosecond dynamics, Tunneling ionization
 Jun 21, 2016
Hiroki Mashiko
 		NTT
 Attosecond pulse generation and its application
 Jun 21, 2016
Katsuya Oguri
 		NTT
 Ultrafast x-ray spectroscopy
Jun 21, 2016
Cheng Huang
 		UEC Molecular dynamics
 Jun 13 - Jul 12, 2016
Michio Matsuzawa
 UEC
Jan 26, 2016
Shinichi Watanabe
 UEC Cold atoms Jun 13 - Jul 12, 2016
Toru Morishita UEC
 Chair
 Jun 13 - Jul 12, 2016
Shun Ohgoda    
UEC
TDSE/Static Field Induced States   
 Jun 13 - Jul 12, 2016
Hsumin Huang UEC 3-body break up Jun 13 - Jul 12, 2016
Masataka Ohmi UEC TDSE/Adiabatic theory
 Jun 13 - Jul 12, 2016
Bangman Wan
 UEC
Jun 13 - Jul 12, 2016
Hossain Ahmed
 UEC
Jun 13 - Jul 12, 2016
Yuki Takayama
 UEC

Hitoshi Inasa
 UEC
Jun 13 - Jul 12, 2016
 Kazumasa Kobayashi
 UEC
Jun 13 - Jul 12, 2016
Hirokazu Matsui
 UEC
 Siegert states
 Jun 13 - Jul 12, 2016



Seminar Program

Jun 21  (Tue) 2016　
Place: Bldg. East 6, Rm. 803

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9:30-10:00 FREE DISCUSSION
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10:00-10:30  Andrey I. Dnestryan and Oleg I. Tolstikhin (MIPT)
"Integral equation approach to the weak-field asymptotic theory of tunneling ionization"
The weak-field asymptotic theory of tunneling (WFAT) ionization is rederived on the basis of the integral equation approach, in the spirit of scattering theory. Integral representations of the asymptotic and distortion coefficients appearing in the WFAT expansion for tunneling ionization rate are obtained. These representations are not sensitive to the behavior of the ionizing orbital in the asymptotic region, and hence return reliable results even if the orbital is expanded in Gaussian basis, as is the case in standard quantum chemistry software
packages for electronic structure calculations. This development is expected to greatly simplify the implementation of the WFAT for polyatomic molecules.


10:30-11:00 Akiyoshi Hishilawa (Nagoya U)
"Asymmetric Coulomb explosion of CO2 in phase-locked two-color intense laser fields"
Laser pulse shaping provides a unique approach to control electron dynamics in intense laser fields. Here we applied ω-2ω pulse shaping to CO2 to break one of the two equivalent C-O bonds in the Coulomb explosion process, CO22+ → CO+ + O+, and observed pronounced dependences on both the ω-2ω relative phase and the laser field intensity. Scenarios to realize the selective bond breaking are discussed.

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11:00-11:15 FREE DISCUSSION
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11:15-11:45 Cheng Huang (UEC)
"Strong-field control of photodissociation dynamics via exceptional points of molecules in an electric field"
Complex-energy resonances of the non-Hermitian system dependent on two real parameters (or a complex parameters) may coalesce at some critical parameter values, which is called exceptional points (EP). EP has been discovered in a broad variety of physical systems such as the microwave cavity, the hydrogen atom in crossed magnetic and electric fields and the exciton-polariton billiard system. In this work, we report the existence of EP for H2+ in the nuclear distance (R) and the electric filed (F) parameter plane. Furthermore, we demonstrate that the photodissociation channel can be effectively controlled via EP.

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11:45-14:00 LUNCH DISCUSSION
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14:00-14:30 Katsuya Oguri (NTT)
"Ultrafast x-ray spectroscopy for pioneering attosecond electron dynamics－Towards Petaherz engineering"
With a technological advances in ultrashort pulse generation from VUV to X-ray region, various ultrafast x-ray spectroscopy techniques have been realized.  These techniques are powerful tools for clarifying the ultrafast dyanmics that can not be accessed with conventional ultrafast laser spectroscopic techniques. In this talk, we introduce an overview of NTT's research activities from ultrafst x-ray spectroscopy to attosecond spectroscopy.

14:30-15:00 Hiroki Mashiko (NTT)
"Attosecond dipole dynamics"
We demonstrated optical drive with 1.16-PHz frequency using gallium nitride (GaN) wide-bandgap semiconductor. An isolated attosecond pulse (IAP) reveals dipole oscillation with 860-as periodicity in the GaN electron and hole system. In addition, we successfully demonstrated full determination of the dipole response (decay time, dipole phase, and dipole oscillation) with inner shell of neon atom using the IAP.

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15:00-15:15 FREE DISCUSSION
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15:15-15:45 Trinh Hoai Vinh (RIKEN)
"Probing two-electron dynamics of helium in time domain via fluorescence channel"
We present a theoretical study for correlation dynamics in coherently excited resonances of helium, using an attosecond pump-probe scheme, by solving the time-dependent Schrödinger equation in the hyperspherical coordinates. In particular, we are looking at channels whose fluorescence signal may contain information on the dynamics evolution of correlated wave packet initiated by absorbing two XUV photons. We calculate the delay dependence of helium ion in the first excited state, separating 2s and 2p channels, and hence the fluorescence signal. The wave package evolution is also analyzed by analogy with the rotation and vibration of a floppy triatomic molecule.


15:45-16:15 Toshiyuki Azuma (RIKEN)
"Ionization of rare gas atoms by circularly polarized intense laser pulses"


16:15-16:35 Shun Ohgoda  (UEC)
"Siegert state method for excitation of a hydrogen atom under a static field by a laser pulse"
When a strong static electric field is applied to an atomic hydrogen, resonant states in the positive energy region are induced. These resonance states are called the static-field-induced states (SFISs) and their energy positions and resonant widths have been theoretically predicted.  One of our main goals now is to establish a theory and a computational method to observe and controll those SFISs by using modern intense laser technologies. In this work, we present a theory to describe the transition amplitude between two Siegert states in a static field, using the Green's function. We also discuss the photoelectron spectra obtined from the transision ampluteds.


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16:35-20:00 FREE DISCUSSION
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Jul 4   (Mon) 2016　
Place: Bldg. East 6, Rm. 529

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15:00-16:00 FREE DISCUSSION
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 16:00-17:00 Chiennan Liu (Fu-jen catholic U)
"Strong field ionization of He(2p)"

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17:00-18:00 FREE DISCUSSION
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Toru Morishita,UEC