Thomas Brabec
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High-harmonic generation in gases and solids Open
We present a quantum optical generalization of the quantum-matter Lewenstein model of high-harmonic generation (HHG) in gases that contains two channels corresponding to the inter and intraband HHG in solids. Both channels can be presented…
Quantum Dial for High-Harmonic Generation Open
High-harmonic generation (HHG) is a highly nonlinear optical process that typically requires an intense laser to trigger emissions at integer multiples of the driving field frequency. Since HHG is commonly used as a spectroscopic tool to p…
Quantum Dial for High-Harmonic Generation Open
High-harmonic generation (HHG) is a highly nonlinear optical process that typically requires an intense laser to trigger emissions at integer multiples of the driving field frequency. However, the strong fields required for conventional HH…
A unified perspective of high-harmonic generation in gases and solids Open
We present a quantum optical generalization of the quantum-matter Lewenstein model of high-harmonic generation (HHG) in gases that contains two channels corresponding to the inter- and intraband HHG in solids. Both channels can be presente…
Strong field physics in open quantum systems Open
Dephasing is the loss of phase coherence due to the interaction of an electron with the environment. The most common approach to model dephasing in light–matter interaction is the relaxation time approximation. Surprisingly, its use in int…
Quantum engineering of high harmonic generation Open
In quantum sideband high harmonic generation (QSHHG), high harmonic generation is perturbed by a bright quantum field resulting in harmonic sidebands, with the intent to transfer non-classical properties from the quantum perturbation to th…
Strong field physics in open quantum systems Open
Dephasing is the loss of phase coherence due to the interaction of an electron with the environment. The most common approach to model dephasing in light-matter interaction is the relaxation time approximation. Surprisingly, its use in int…
Orbital angular momentum control of strong-field physics in gas phase Open
Photoionization plays a pivotal role in several physical, chemical, and biological processes. When induced in an atom or molecule by an intense laser pulse, the electron dynamics in the laser field lead to new phenomena that form the basis…
Photon bunching in high-harmonic emission controlled by quantum light Open
Attosecond spectroscopy comprises several techniques to probe matter through electrons and photons. One frontier of attosecond methods is to reveal complex phenomena arising from quantum-mechanical correlations in the matter system, in the…
Table-Top Tunable Chiral Photonic Emitter Open
The increasing interest in chiral light stems from its spiral trajectory along the propagation direction, facilitating the interaction between different polarization states of light and matter. Despite tremendous achievements in chiral lig…
Table-Top Tunable Chiral Photonic Emitter Open
The increasing interest in chiral light stems from its spiral trajectory along the propagation direction, facilitating the interaction between different polarization states of light and matter. Despite tremendous achievements in chiral lig…
Orbital perspective on high-harmonic generation from solids Open
High-harmonic generation in solids allows probing and controlling electron dynamics in crystals on few femtosecond timescales, paving the way to lightwave electronics. In the spatial domain, recent advances in the real-space interpretation…
Gauge Invariant Formulation of the Semiconductor Bloch Equations Open
We derive gauge invariant semiconductor Bloch equations (GI-SBEs) that contain only gauge invariant band structure; shift vectors, and triple phase products. The validity and utility of the GI-SBEs is demonstrated in intense laser driven s…
View article: Spectroscopic Signatures of Plasmonic Near‐Fields on High‐Harmonic Emission
Spectroscopic Signatures of Plasmonic Near‐Fields on High‐Harmonic Emission Open
Intense laser fields can reveal the attosecond and femtosecond response of matter in the emitted photoelectrons and high‐harmonic photons. The complementary perspective offered by these two messengers is well explored in gas molecules and,…
Intrinsic dichroism in amorphous and crystalline solids with helical light Open
Amorphous solids do not exhibit long-range order due to the disordered arrangement of atoms. As a result, they lack translational and rotational symmetry on a macroscopic scale and are isotropic, meaning their physical properties remain th…
Orbital perspective on high-harmonic generation from solids Open
High-harmonic generation in solids allows probing and controlling electron dynamics in crystals on few femtosecond timescales, paving the way to lightwave electronics. In the spatial domain, recent advances in the real-space interpretation…
Orbital perspective on high-harmonic generation from solids Open
High-harmonic generation in solids allows probing and controlling electron dynamics in crystals on few femtosecond timescales, paving the way to lightwave electronics. In the spatial domain, recent advances in the real-space interpretation…
Keldysh ionization theory of atoms: mathematical details Open
Keldysh ionization theory is one of the main pillars of strong field physics and attosecond science. It describes non-relativistic ionization rates of hydrogen-like atoms subjected to strong laser fields within the dipole approximation and…
Scalable nonlinear helical dichroism in chiral and achiral molecules Open
Chiral interactions are prevalent in nature, driving a variety of bio-chemical processes. Discerning the two non-superimposable mirror images of a chiral molecule, known as enantiomers, requires interaction with a chiral reagent with known…
Nonlinear Lorentz Model for Explicit Integration of Optical Nonlinearity in FDTD Open
Including optical nonlinearity in FDTD software in a stable, efficient, and rigorous way can be challenging. Traditional methods address this challenge by solving an implicit form of Maxwell’s equations iteratively. Reaching numerical conv…
Simultaneous double ionization of C<sub>60</sub> molecules in single-cycle pulses Open
We theoretically investigate simultaneous double ionization of C 60 Buckminsterfullerene clusters within the strong field approximation, taking into account two-body effects like Coulomb blocking. Our analysis suggests that for infrared si…
Wannier quasi-classical approach to high harmonic generation in semiconductors Open
An intuitive and complete understanding of the underlying processes in high harmonic generation (HHG) in solids will enable the development and optimization of experimental techniques for attosecond measurement of dynamical and structural …
Wannier quasi-classical approach to high harmonic generation in\n semiconductors Open
We develop a quasi-classical theory of high harmonic generation in\nsemiconductors based on an interband current that has been transformed from\nBloch to Wannier basis. The Wannier quasi-classical approach reveals a complete\npicture of th…
Coulomb blocking of sequential tunnel ionization in complex systems Open
When atoms and molecules are exposed to intense low frequency laser fields, the dominant response is sequential tunnel ionization of charge states with increasing ionization potential. Sequential ionization is assumed to proceed as separat…
Physical mechanisms encoded in photoionization yield from IR+XUV setups Open
We theoretically examine how and to which extent physical processes can be retrieved from two-color pump-probe experiments of atomic and molecular gases driven by an attosecond XUV pulse train and an infrared (IR) pulse. The He atom, the N…
Nonlinear Lorentz model for the description of nonlinear optical dispersion in nanophotonics simulations [Invited] Open
The Lorentz model provides a simple and intuitive approach to linear optical dispersion. In this paper, we present a nonlinear formulation of the Lorentz model based on an analytical solution of a quantum-mechanical two-level model atom in…
Multi-Band Petahertz Currents Resolved via High Harmonic Generation Spectroscopy Open
Strong field driven electric currents in condensed matter systems open new frontiers in petahertz electronics. In this regime new challenges arise as the role of the band structure and the quantum nature of electron-hole dynamics have yet …