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Observation of the exciton Mott transition in the photoluminescence of coupled quantum wells by Kiršanskė, Gabija; Tighineanu, Petru; Daveau, Raphaël S.; Miguel-Sánchez, Javier; Lodahl, Peter; Stobbe, Søren is a scholarly article available to read on EtoBox.

What is Observation of the exciton Mott transition in the photoluminescence of coupled quantum wells about?

Indirect excitons in coupled quantum wells have long radiative lifetimes and form a cold quasi-two-dimensional population suitable for studying collective quantum effects. Here we report the observation of the exciton Mott transition from an insulating (excitons) to a conducting (ionized electron-hole pairs) phase, which occurs gradually as a function of carrier density and temperature. The transition is inferred from spectral and time-resolved photoluminescence measurements around a carrier density of $2\times10^{10} \mathrm{cm}^{-2}$ and temperatures of $12-16 \mathrm{K}$. An externally applied electric field is employed to tune the dynamics of the transition via the quantum-confined Stark effect. Our results provide evidence of a gradual nature of the exciton Mott transition.

Author

Kiršanskė, Gabija; Tighineanu, Petru; Daveau, Raphaël S.; Miguel-Sánchez, Javier; Lodahl, Peter; Stobbe, Søren

Published

2016

Language

EN