Hexagonal boron nitride (hBN) is a wide band gap material with both strong excitonic light
emission in the ultraviolet and strong exciton-phonon coupling. Luminescence experiments …

The concept of optical exciton—a photoexcited bound electron-hole pair within a crystal—is
routinely used to interpret and model a wealth of excited-state phenomena in …

Since the discovery of superconductive twisted bilayer graphene which initiated the field of
twistronics, moiré systems have not ceased to exhibit fascinating properties. We …

Two-dimensional (2D) MXenes are a rapid growing family of 2D materials with rich physical
and chemical properties where their surface termination plays an essential role. Among the …

Microcavity exciton-polaritons are two-dimensional bosonic quasiparticles composed by
excitons and photons. Using a model Hamiltonian with parameters generated from ab initio …

Using a time-resolved cathodoluminescence system dedicated to the UV spectral range, we
present an estimate of the radiative lifetime of free excitons in hexagonal boron nitride (hBN) …

One of the main interests of 2D materials is their ability to be assembled with many degrees
of freedom for tuning and manipulating excitonic properties. There is a need to understand …

Efficient solid-state photon emitters with longer operating lifetimes in the ultraviolet (UV)
wavelength range are crucial for optoelectronic devices. However, finding suitable material …

There are many ways of engineering the band gap of nanoribbons, including application of
stress, electric field, and functionalization of the edges. In this paper, we investigate …

In this work, we scrutinise theoretically how the gap of C and BN armchair nanoribbons
changes upon variations of the bond length between edge atoms and their distance from …