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Exciton radiative lifetimes in hexagonal diamond Ge and SiGe alloys
Michele Re Fiorentin, Michele Amato, Maurizia Palummo
Recent reports of strong room-temperature photoluminescence in hexagonal diamond (2H) germanium stand in marked contrast to theoretical predictions of very weak band-edge optical t…
Quasiparticle effects and strong excitonic features in exfoliable 1D semiconducting materials
Simone Grillo, Chiara Cignarella, Friedhelm Bechstedt +5
We report a comprehensive first-principles study of the electronic and optical properties of recently identified exfoliable one-dimensional semiconducting materials, focusing on ch…
Influence of Interlayer Stacking on Optical Behavior in WSe/MoS van der Waals Heterostructures
Widad Louafi, Karim Rezouali, Daniele Varsano +3
We investigate the impact of crystal alignment on excitonic behavior in WSe/MoS van der Waals heterostructures by comparing eclipsed (AA) and staggered (AB) stacking co…
Optical absorption in hexagonal-diamond Si and Ge nanowires: insights from STEM-EELS experiments and ab initio theory
Luiz H. G. Tizei, Michele Re Fiorentin, Thomas Dursap +6
Hexagonal-diamond (2H) group IV nanowires are key for advancing group IV-based lasers, quantum electronics, and photonics. Understanding their dielectric response is crucial for pe…