Omer Kneller
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View article: Vectorial attosecond transient spectroscopy
Vectorial attosecond transient spectroscopy Open
Light-matter interactions reflect the symmetry properties of the medium, imprinting both dynamical and structural information onto the vectorial properties of the interacting field. In the non-linear regime, such symmetry can undergo drama…
View article: Attosecond Fourier Transform Spectroscopy
Attosecond Fourier Transform Spectroscopy Open
Attosecond metrology reveals the sub-cycle temporal evolution of field-driven systems by their interaction with attosecond pulses. However, the large bandwidth of attosecond pulses couples the contribution of multiple quantum states into t…
View article: Measuring and controlling the birth of quantum attosecond pulses
Measuring and controlling the birth of quantum attosecond pulses Open
The generation and control of extreme ultraviolet (XUV) radiation by high harmonic generation (HHG) have advanced ultrafast science, providing direct insights into electron dynamics on their natural time scale. Attosecond science has estab…
View article: Attosecond transient interferometry
Attosecond transient interferometry Open
Attosecond transient absorption resolves the instantaneous response of a quantum system as it interacts with a laser field, by mapping its sub-cycle dynamics onto the absorption spectrum of attosecond pulses. However, the quantum dynamics …
View article: Revealing the Berry phase under the tunneling barrier
Revealing the Berry phase under the tunneling barrier Open
In quantum mechanics, a quantum wavepacket may acquire a geometrical phase as it evolves along a cyclic trajectory in parameter space. In condensed matter systems, the Berry phase plays a crucial role in fundamental phenomena such as the H…
View article: Laser-Induced Electron Diffraction in Chiral Molecules
Laser-Induced Electron Diffraction in Chiral Molecules Open
Strong laser pulses enable probing molecules with their own electrons. The oscillating electric field tears electrons off a molecule, accelerates them, and drives them back toward their parent ion within a few femtoseconds. The electrons a…
View article: Observation of interband Berry phase in laser-driven crystals
Observation of interband Berry phase in laser-driven crystals Open
Ever since its discovery 1 , the notion of the Berry phase has permeated all branches of physics and plays an important part in a variety of quantum phenomena 2 . However, so far all its realizations have been based on a continuous evoluti…
View article: Attosecond Transient Interferometry
Attosecond Transient Interferometry Open
Attosecond transient absorption resolves the instantaneous response of a quantum system as it interacts with a laser field, by mapping its sub-cycle dynamics onto the absorption spectrum of attosecond pulses. However, the quantum dynamics …
View article: Observation of interband Berry phase in laser driven crystals
Observation of interband Berry phase in laser driven crystals Open
Ever since its discovery, the notion of Berry phase has permeated through all branches of physics, being at the heart of a large variety of quantum phenomena. However, so far all its realizations were based on a continuous evolution of the…
View article: Is the dark-matter halo spin a predictor of galaxy spin and size?
Is the dark-matter halo spin a predictor of galaxy spin and size? Open
The similarity between the distributions of spins for galaxies (λgal) and for dark-matter haloes (λhalo), indicated both by simulations and observations, is naively interpreted as a one-to-one correlation between the spins of a galaxy and …
View article: Evolution of galaxy shapes from prolate to oblate through compaction events
Evolution of galaxy shapes from prolate to oblate through compaction events Open
We study the evolution of global shapes of galaxies using cosmological simulations. The shapes refer to the components of dark matter (DM), stars and gas at the stellar half-mass radius. Most galaxies undergo a characteristic compaction ev…