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Analog simulation of high harmonic generation in atoms
Javier Argüello-Luengo, Javier Rivera-Dean, Philipp Stammer +4
The demanding experimental access to the ultrafast dynamics of materials challenges our understanding of their electronic response to applied strong laser fields. For this purpose,…
Femtosecond pulse parameter estimation from photoelectron momenta using machine learning
Tomasz Szołdra, Marcelo F. Ciappina, Nicholas Werby +4
Deep learning models have provided huge interpretation power for image-like data. Specifically, convolutional neural networks (CNNs) have demonstrated incredible acuity for tasks s…
Pulse length effects in long wavelength driven non-sequential double ionization
H. Jiang, M. Mandrysz, A. Sanchez +8
We present a joint experimental and theoretical study of non-sequential double ionization (NSDI) in argon driven by a 3100-nm laser source. The correlated photoelectron momentum di…
Strong-field chiral imaging with twisted photoelectrons
Xavier Barcons Planas, Andrés Ordóñez, Maciej Lewenstein +1
Ultrafast imaging of molecular chirality is a key step towards the dream of imaging and interpreting electronic dynamics in complex and biologically relevant molecules. Here, we pr…
Entanglement of Orbital Angular Momentum in Non-Sequential Double Ionization
Andrew S. Maxwell, Lars Bojer Madsen, Maciej Lewenstein
We demonstrate entanglement between the orbital angular momentum (OAM) of two photoelectrons ionized via the strongly correlated process of non-sequential double ionization (NSDI).…
Three-electron correlations in strong laser field ionization: Spin induced effects
Dmitry Efimov, Artur Maksymov, Marcelo Ciapina +3
Strong field processes in the non-relativistic regime are insensitive to the electron spin, i.e. the observables appear to be independent of this electron property. This does not h…
Conservation laws for Electron Vortices in Strong-Field Ionisation
Yuxin Kang, Emilio Pisanty, Marcelo Ciappina +3
We investigate twisted electrons with a well defined orbital angular momentum, which have been ionised via a strong laser field. By formulating a new variant of the well-known stro…
Principal frequency of an ultrashort laser pulse
Enrique G. Neyra, Pablo Vaveliuk, Emilio Pisanty +3
We introduce an alternative definition of the main frequency of an ultrashort laser pulse, the principal frequency . This parameter is complementary to the most accepted and w…
Laser-assisted photoionization of argon atoms: streaking, sideband and pulse train studying cases
Renata Della Picca, Marcelo F. Ciappina, Maciej Lewenstein +1
We present a theoretical study of atomic laser-assisted photoionization emission (LAPE). We consider an atom driven by a linearly polarized XUV laser in two different scenarios: i)…
Theoretical Atto-nano Physics
Marcelo F. Ciappina, Maciej Lewenstein
Two emerging areas of research, attosecond and nanoscale physics, have recently started to merge. Attosecond physics deals with phenomena occurring when ultrashort laser pulses, wi…
Simultaneous control of harmonic yield and energy cutoff of high-harmonic generation using seeded plasmonic-enhanced fields
Irfana N. Ansari, M. S. Mrudul, Marcelo F. Ciappina +2
We study high-order harmonic generation (HHG) driven by seeded plasmonic-enhanced fields. On one hand, plasmonic-enhanced fields have shown a great potential to extend the HHG cuto…
Two interacting ultracold molecules in a one-dimensional harmonic trap
Anna Dawid, Maciej Lewenstein, Michał Tomza
We investigate the properties of two interacting ultracold polar molecules described as distinguishable quantum rigid rotors, trapped in a one-dimensional harmonic potential. The m…
Restricted space ab initio models for double ionization by strong laser pulses
Dmitry K. Efimov, Artur Maksymov, Jakub S. Prauzner-Bechcicki +5
Double electron ionisation process occurs when an intense laser pulse interacts with atoms or molecules. Exact {\it ab initio} numerical simulation of such a situation is extremely…
High-order harmonic generation in atomic and molecular systems
Noslen Suárez, Alexis Chacón, Jose A. Pérez-Hernández +3
High-order harmonic generation (HHG) results from strong-field laser matter interaction and it is one of the main processes that are used to extract electron structural and dynamic…
Emergence of a higher energy structure in strong field ionization with inhomogeneous electric fields
L. Ortmann, J. A. Pérez-Hernández, M. F. Ciappina +6
Studies of strong field ionization have historically relied on the strong field approximation, which neglects all spatial dependence in the forces experienced by the electron after…
Attosecond physics at the nanoscale
M. F. Ciappina, J. A. Pérez-Hernández, A. S. Landsman +22
Recently two emerging areas of research, attosecond and nanoscale physics, have started to come together. Attosecond physics deals with phenomena occurring when ultrashort laser pu…
High-order harmonic generation from Rydberg atoms driven by plasmonic-enhanced laser fields
Y. Tikman, I. Yavuz, M. F. Ciappina +3
We theoretically investigate high-order harmonic generation (HHG) in Rydberg atoms driven by spatially inhomogeneous laser fields, induced, for instance, by plasmonic enhancement.…
Controlling electron localization of H by intense plasmon-enhanced laser fields
I. Yavuz, M. F. Ciappina, A. Chacón +2
We present a theoretical study of the wave packet dynamics of the H molecular ion in plasmon-enhanced laser fields. Such fields may be produced, for instance, when metallic n…
Above-threshold ionization and photoelectron spectra in atomic systems driven by strong laser fields
Noslen Suárez, Alexis Chacón, Marcelo Ciappina +2
Above-threshold ionization (ATI) results from strong field laser-matter interaction and it is one of the fundamental processes that may be used to extract electron structural and d…
Numerical studies of light-matter interaction driven by plasmonic fields: the velocity gauge
A. Chacón, M. Lewenstein, M. F. Ciappina
Theoretical approaches to strong field phenomena driven by plasmonic fields are based on the length gauge formulation of the laser-matter coupling. From the theoretical viewpoint i…
High-order harmonic generation at high laser intensities beyond the tunnel regime
J. A. Pérez-Hernández, M. F. Ciappina, M. Lewenstein +2
We present studies of high-order harmonic generation (HHG) at laser intensities well above saturation. We use driving laser pulses which present a particular electron dynamics in t…
High order harmonic generation in noble gases using plasmonic field enhancement
M. F. Ciappina, T. Shaaran, M. Lewenstein
We present theoretical studies of high-order harmonic generation (HHG) in rare gases driven by plasmonic field enhancement. This kind of fields appears when plasmonic nanostructure…
Controlling high-harmonic generation and above-threshold ionization with an attosecond-pulse train
C. Figueira de Morisson Faria, P. Salieres, P. Villain +1
We perform a detailed analysis of how high-order harmonic generation (HHG) and above-threshold ionization (ATI) can be controlled by a time-delayed attosecond-pulse train superpose…
Bound-state corrections in laser-induced nonsequential double ionization
C. Figueira de Morisson Faria, M. Lewenstein
We perform a systematic analysis of how nonsequential double ionization in intense, linearly polarized laser fields is influenced by the initial states in which both electrons are…