This paper has been prepared by the Symphony collaboration (University of Warsaw,
Uniwersytet Jagielloński, DESY/CNR and ICFO) on the occasion of the 25th anniversary of …

Interaction of intense lasers with solid materials offers an alternative way to achieve high-
order harmonic generation (HHG). Since the underlying mechanisms of the harmonic …

Strong-field laser excitation of solids can produce extremely nonlinear electronic and optical
behaviour. As recently demonstrated, this includes the generation of high harmonics …

The frequency of electric currents associated with charge carriers moving in the electronic
bands of solids determines the speed limit of electronics and thereby that of information and …

The sub-laser-cycle timescale of the electronic response to strong fields enables attosecond
dynamical imaging in atoms, molecules and solids,,–, with optical tunnelling and high …

The band structure of matter determines its properties. In solids, it is typically mapped with
angle-resolved photoemission spectroscopy, in which the momentum and the energy of …

Symmetry is one of the most generic and useful concepts in science, often leading to
conservation laws and selection rules. Here we formulate a general group theory for …

High harmonic generation (HHG) in atomic and molecular gases builds the foundation of
attosecond science. In recent experiments HHG has been demonstrated in solids for the first …

We investigate theoretically the strong-field regime of light-matter interactions in the
topological-insulator class of quantum materials. In particular, we focus on the process of …

We theoretically study high-order-harmonic generation (HHG) from solids driven by intense
laser pulses using a one-dimensional model periodic crystal. By numerically solving the time …