Trapping Dipolar Exciton Fluids in GaN/(AlGa)N Nanostructures

François Chiaruttini (1) , Thierry Guillet (1) , Christelle Brimont (1) , Benoit Jouault (1) , Pierre Lefebvre (1) , Jessica Vives (2) , Sebastien Chenot (2) , Yvon Cordier (2) , Benjamin Damilano (2) , Maria Vladimirova (1)

1 L2C - Laboratoire Charles Coulomb
2 CRHEA - Centre de recherche sur l'hétéroepitaxie et ses applications

Dipolar excitons offer a rich playground for both design of novel optoelectronic devices and fundamental many-body physics. Wide GaN/(AlGa)N quantum wells host a new and promising realization of dipolar excitons. We demonstrate the in-plane confinement and cooling of these excitons, when trapped in the electrostatic potential created by semitransparent electrodes of various shapes deposited on the sample surface. This result is a prerequisite for the electrical control of the exciton densities and fluxes, as well for studies of the complex phase diagram of these dipolar bosons at low temperature.

Mots clés: have a long; Coulomb-bound but spatially separated electron-hole pairs; gallium nitride Dipolar excitons; gallium nitride; electrostatic traps; cooling; exciton fluid

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Optique [physics.optics]; Micro et nanotechnologies/Microélectronique; Optique / photonique

François Chiaruttini, Thierry Guillet, Christelle Brimont, Benoit Jouault, Pierre Lefebvre, et al.. Trapping Dipolar Exciton Fluids in GaN/(AlGa)N Nanostructures. Nano Letters, 2019, 19 (8), pp.4911-4918. ⟨10.1021/acs.nanolett.9b00914⟩. ⟨hal-02272702⟩