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

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 …

Ta 2 NiSe 5 is one of the most promising materials for hosting an excitonic insulator ground
state. While a number of experimental observations have been interpreted in this way, the …

Coulomb attraction between electrons and holes in a narrow-gap semiconductor or a
semimetal is predicted to lead to an elusive phase of matter dubbed excitonic insulator …

Using light to manipulate materials into desired states is one of the goals in condensed
matter physics, since light control can provide ultrafast and environmentally friendly …

There is currently great interest in the strong coupling between the quantized photon field of
a cavity and electronic or other degrees of freedom in materials. A major goal is the creation …

The excitonic insulator is an intriguing electronic phase of condensed excitons. A prominent
candidate is the small bandgap semiconductor Ta2NiSe5, in which excitons are believed to …

Ultrafast control of material physical properties represents a rapidly develo** 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 …

We present a combined study from angle-resolved photoemission and density-functional-
theory calculations of the temperature-dependent electronic structure in the excitonic …