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 advent of pump-probe spectroscopy techniques paved the way to the exploration of
ultrafast dynamics of electrons and phonons in crystalline solids. Following photo-absorption …

In the last decade, there has been a proliferation of laser sources for time-and angle-
resolved photoemission spectroscopy (TR-ARPES), building on the proven capability of this …

Ultrafast control of material physical properties represents a rapidly developing field in
condensed matter physics. Yet, accessing the long-lived photoinduced electronic states is …

The excitonic insulator is an electronically driven phase of matter that emerges upon the
spontaneous formation and Bose condensation of excitons. Detecting this exotic order in …

Excitons, quasiparticles of electrons and holes bound by Coulombic attraction, are created
transiently by light and play an important role in optoelectronics, photovoltaics and …

Abstract The layered chalcogenide Ta2NiSe5 has been proposed to host an excitonic
condensate in its ground state, a phase that could offer a unique platform to study and …

The nonequilibrium dynamics during photoinduced insulator-to-metal transition (IMT) in the
excitonic insulator (EI) candidate Ta 2 NiSe 5 have been investigated, which reproduce the …

Layer-by-layer material engineering has produced interesting quantum phenomena such as
interfacial superconductivity and the quantum anomalous Hall effect. However, probing …

Excitonic insulators host a condensate of electron-hole pairs at equilibrium, giving rise to
collective many-body effects. Although several materials have emerged as excitonic …