title: Lasing from individual GaAs-AlGaAs core-shell nanowires up to room temperature.
abstract: Semiconductor nanowires are widely considered to be the next frontier in the drive towards ultra-small, highly efficient coherent light sources. While NW lasers in the visible and ultraviolet have been widely demonstrated, the major role of surface and Auger recombination has hindered their development in the near infrared. Here we report infrared lasing up to room temperature from individual core-shell GaAs-AlGaAs nanowires. When subject to pulsed optical excitation, NWs exhibit lasing, characterized by single-mode emission at 10 K with a linewidth <60 GHz. The major role of non-radiative surface recombination is obviated by the presence of an AlGaAs shell around the GaAs-active region. Remarkably low threshold pump power densities down to ~760 W cm(-2) are observed at 10 K, with a characteristic temperature of T(0)=109±12 K and lasing operation up to room temperature. Our results show that, by carefully designing the materials composition profile, high-performance infrared NW lasers can be realised using III/V semiconductors.
authors.affiliation: Walter Schottky Institut and Physik Department, Technische Universität München, Am Coulombwall 4, 85748 Garching, Germany.
authors.forename: Benedikt
authors.initials: B
authors.lastname: Mayer
authors.forename: Daniel
authors.initials: D
authors.lastname: Rudolph
authors.forename: Joscha
authors.initials: J
authors.lastname: Schnell
authors.forename: Stefanie
authors.initials: S
authors.lastname: Morkötter
authors.forename: Julia
authors.initials: J
authors.lastname: Winnerl
authors.forename: Julian
authors.initials: J
authors.lastname: Treu
authors.forename: Kai
authors.initials: K
authors.lastname: Müller
authors.forename: Gregor
authors.initials: G
authors.lastname: Bracher
authors.forename: Gerhard
authors.initials: G
authors.lastname: Abstreiter
authors.forename: Gregor
authors.initials: G
authors.lastname: Koblmüller
authors.forename: Jonathan J
authors.initials: JJ
authors.lastname: Finley