The past decade has witnessed an explosion in the field of quantum materials, headlined by
the predictions and discoveries of novel Landau-symmetry-broken phases in correlated …

This work reviews the experimental studies on photo-induced cooperative phenomena
(photo-induced phase transitions, PIPT), which are related to ultrafast structural and …

We introduce ultrafast low-energy electron diffraction (ULEED) in backscattering for the
study of structural dynamics at surfaces. Using a tip-based source of ultrashort electron …

Photo-induced switching between collective quantum states of matter is a fascinating rising
field with exciting opportunities for novel technologies. Presently, very intensively studied …

Domain walls (DWs) are singularities in an ordered medium that often host exotic
phenomena such as charge ordering, insulator-metal transition, or superconductivity. The …

The tunability of materials properties by light promises a wealth of future applications in
energy conversion and information technology. Strongly correlated materials such as …

Strong light-matter interactions within nanoscale structures offer the possibility of optically
controlling material properties. Motivated by the recent discovery of intrinsic long-range …

When two periodic potentials compete in materials, one may adopt the other, which
straightforwardly generates topological defects. Of particular interest are domain walls in …

Metal halide perovskites have emerged as promising materials for optoelectronic
applications in the last decade. A large amount of effort has been made to investigate the …

Distinct many-body states may be created under non-equilibrium conditions through
different ordering paths, even when their constituents are subjected to the same …