Suren Sukiasyan

Yerevan State University

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Misha Ivanov

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

Thomas Brabec

University of Ottawa

Chris McDonald

University of Ottawa

Carlos F. Destefani

Universitat Autònoma de Barcelona

Olga Smirnova

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

Alejandro Zielinski

Ludwig-Maximilians-Universität München

A. S. Kheifets

Australian National University

Jivesh Kaushal

University of Rostock

ИА

И. А. Иванов

Institute for Basic Science

Lisa Torlina

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

Cooperative Institutions

Imperial College London

Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy

University of Ottawa

CEA Paris-Saclay

Max Planck Institute for Nuclear Physics

ETH Zurich

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Centre National de la Recherche Scientifique

Université Paris-Saclay

Max Planck Society

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Correlation-driven electron dynamics in attosecond photoionization of helium

Kenichi L. Ishikawa Suren Sukiasyan Misha Ivanov

We present attosecond dynamics of electron-electron correlation-driven knock-up/down process following photoionization of excited helium. Its time scale is linked to the time for the outgoing inner electron to traverse the orbit of the outer electron.

Attosecond

Electronic correlation

Autoionization

10.1109/cleopr.2013.6600028

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Reaction cross sections for the H+D2(ν=1)→HD+D and D+H2(ν=1)→DH+H systems. A multiconfiguration time-dependent Hartree (MCTDH) wave packet propagation study

The Journal of Chemical Physics (2002)

Suren Sukiasyan Hans‐Dieter Meyer

Cumulative initial-state-selected reaction cross sections of the H+D2 and D+H2 systems are computed for collision energies up to 1.6 eV and initial vibrational and rotational quantum numbers ν0=1 and j0=0–4. The Boothroyd–Keogh–Martin–Peterson (BKMP2) potential energy surface is taken as interaction potential. For comparison the Liu–Siegbahn–Truhlar–Horowitz (LSTH) potential energy surface is also considered, however, for j0=0 only. The cross sections are computed by propagating wave packets employing the multiconfiguration time-dependent Hartree scheme. The reactive flux, which determines the integral cross section, is evaluated through the interaction of the wave packet with a complex absorbing potential. A new approach of J-interpolation for the reaction probabilities has been developed. This approach allows to skip about every second of the individual propagations. The presence of weak oscillations appearing in the total integral cross sections has been observed. As in our previous calculations [J. Phys. Chem. 105, 2604 (2001)] on ν0=0, we attribute them to transition state resonances associated with excitations of the bending motion. Some of the present results are compared with previous results obtained by using the coupled states approximation.

Hartree

Potential energy surface

Quantum number

Interpolation

10.1063/1.1479346

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Citations (51)

Interpreting Attoclock Measurements of Tunnelling Times

arXiv (Cornell University) (2014)

Lisa Torlina Felipe Morales Jivesh Kaushal H. G. Muller И. А. Иванов

Resolving in time the dynamics of light absorption by atoms and molecules, and the electronic rearrangement this induces, is among the most challenging goals of attosecond spectroscopy. The attoclock is an elegant approach to this problem, which encodes ionization times in the strong-field regime. However, the accurate reconstruction of these times from experimental data presents a formidable theoretical challenge. Here, we solve this problem by combining analytical theory with ab-initio numerical simulations. We apply our theory to numerical attoclock experiments on the hydrogen atom to extract ionization time delays and analyse their nature. Strong field ionization is often viewed as optical tunnelling through the barrier created by the field and the core potential. We show that, in the hydrogen atom, optical tunnelling is instantaneous. By calibrating the attoclock using the hydrogen atom, our method opens the way to identify possible delays associated with multielectron dynamics during strong-field ionization.

Attosecond

Hydrogen atom

Tunnel ionization

10.48550/arxiv.1402.5620

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Chemical Physics (2009)

Suren Sukiasyan Chris McDonald C. Van Vlack Carlos F. Destefani Charles Varin

Dynamics

10.1016/j.chemphys.2009.10.001

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Citations (8)

Interpreting Attoclock Measurements of Tunnelling Times

arXiv (Cornell University) (2014)

Lisa Torlina Felipe Morales Jivesh Kaushal H. G. Muller И. А. Иванов

Attosecond

Hydrogen atom

Tunnel ionization

Source

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Citations (4)

Controlling transition matrix elements and relaxation in a two-electron double quantum dot

Physical Review B (2009)

Carlos F. Destefani Chris McDonald Suren Sukiasyan Thomas Brabec

We demonstrate theoretically that transition matrix elements between ground and first-excited singlet states of a two-dimensional two-electron lateral double quantum dot can be controlled and changed by orders of magnitude by varying the interdot barrier. As a result, decay arising from system-environment coupling can be controlled. A potential ramp is identified by which the system is nonadiabatically inverted and then frozen by insulating it against environmental decay.

Matrix (chemical analysis)

10.1103/physrevb.79.155322

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Exchange and polarization effect in high-order harmonic imaging of molecular structures

Physical Review A (2010)

Suren Sukiasyan Serguei Patchkovskii Olga Smirnova Thomas Brabec Misha Ivanov

We analyze the importance of exchange, polarization, and electron-electron correlation in high-order harmonic generation in molecules interacting with intense laser fields. We find that electron exchange can become particularly important for harmonic emission associated with intermediate excitations in the molecular ion. In particular, for orbitals associated with two-hole one-particle excitations, exchange effects can eliminate structure-related minima and maxima in the harmonic spectra. Laser-induced polarization of the neutral molecule may also have major effects on orbital structure-related minima and maxima in the harmonic spectra. Finally, we show how exchange terms in recombination can be viewed as a shakedownlike process induced by sudden electronic excitation in the ion.

Maxima and minima

Harmonic

10.1103/physreva.82.043414

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Citations (46)

Multielectron Correlation in High-Harmonic Generation: A 2D Model Analysis

Physical Review Letters (2009)

Suren Sukiasyan Chris McDonald Carlos F. Destefani Misha Ivanov Thomas Brabec

We analyze the role of multielectron dynamics in high-harmonic generation spectroscopy, using an example of a two-electron system. We identify and systematically quantify the importance of correlation and exchange effects. One of the main sources for correlation is identified to be the polarization of the ion by the recombining continuum electron. This effect, which plays an important qualitative and quantitative role, seriously undermines the validity of the standard approaches to high-harmonic generation, which ignore the contribution of excited ionic states to the radiative recombination of the continuum electron.

Electronic correlation

10.1103/physrevlett.102.223002

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Citations (63)

Plasmon dynamics in strongly driven finite few-electron quantum systems: The role of the surface

Physical Review B (2010)

Carlos F. Destefani Chris McDonald Suren Sukiasyan Thomas Brabec

An ab initio analysis of laser driven, few-electron plasmon dynamics in a finite lateral quantum dot is performed. The results are analyzed by a comparison to a Drude model based on the center-of-mass motion of the plasmon. We find that decay and energy absorption during the plasmon-surface interaction do not depend on electron correlation. This suggests that the Kohn theorem---plasmon dynamics in infinite parabolic quantum dots does not depend on electron correlation---is extendable to finite quantum dots.

Localized surface plasmon

Dynamics

Electronic correlation

10.1103/physrevb.81.045314

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Citations (2)

Rotational excitation cross sections of para-H2+para-H2 collisions. A full-dimensional wave-packet propagation study using an exact form of the kinetic energy

The Journal of Chemical Physics (2005)

Fabien Gatti Frank Otto Suren Sukiasyan Hans‐Dieter Meyer

A full-dimensional quantum dynamical study of the rotational excitation in para-para H2+H2 collisions using the potential-energy surface of Boothroyd et al. [J. Chem. Phys. 116, 666 (2002)] is reported. The multiconfiguration time-dependent Hartree algorithm is utilized to propagate wave packets and the cross sections for collision energies up to 1.2 eV are determined by a flux analysis through the interaction of the wave packet with a complex absorbing potential. Calculations for a collection of total angular momenta up to J=70 are performed; the missing channels are obtained with a J-interpolation algorithm.

Interpolation

Potential energy surface

Quantum number

10.1063/1.2085167

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Citations (64)