The physics of quantum materials is dictated by many-body interactions and mathematical
concepts such as symmetry and topology that have transformed our understanding of matter …

Recent progress in utilizing ultrafast light-matter interaction to control the macroscopic
properties of quantum materials is reviewed. Particular emphasis is placed on photoinduced …

Angle-resolved photoemission spectroscopy (ARPES), with its exceptional sensitivity to both
the binding energy and the momentum of valence electrons in solids, provides unparalleled …

The ability to tune material properties using gating by electric fields is at the heart of modern
electronic technology. It is also a driving force behind recent advances in two-dimensional …

Hidden states of matter may be created if a system out of equilibrium follows a trajectory to a
state that is inaccessible or does not exist under normal equilibrium conditions. We found …

The study of nonequilibrium phenomena in correlated lattice systems has developed into
one of the most active and exciting branches of condensed matter physics. This research …

The occurrence of charge-density waves in three selected layered transition-metal
dichalcogenides—1T-TaS 2, 2H-TaSe 2 and 1T-TiSe 2—is discussed from an …

Hard x-ray photoelectron spectroscopy (HAXPES) is establishing itself as an essential
technique for the characterisation of materials. The number of specialised photoelectron …

Free-electron lasers produce extremely brief, coherent, and bright laser-like photon pulses
that allow to image matter at atomic resolution and at timescales faster than the …

Low-dimensional electron systems, as realized in layered materials, often tend to
spontaneously break the symmetry of the underlying nuclear lattice by forming so-called …