Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-11-23
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures
Scientific paper
A holy grail of photonics research is the realization of a laser that uses a single quantum emitter as the gain medium. Such a device would exhibit a plethora of new features, including lasing without a well-defined threshold and output intensity fluctuations that remain below the shot-noise limit. While single-atom lasers have been demonstrated, compact devices capable of continuous-wave operation require monolithic structures involving a solid-state quantum emitter. Here, we report the observation of steady-state laser amplification in Raman transitions between the lowest-energy entangled spin states of a quantum-dot molecule. Absorption and resonance fluorescence experiments demonstrate that the singlet and triplet states have electric-dipole coupling to a common optically excited state. Fast spin relaxation ensures population inversion on the triplet transition when the singlet transition is driven resonantly. By embedding the quantum-dot molecule in a cavity of modest quality factor, a solid-state single-emitter laser could be realized.
Elzerman Jeroen M.
Imamoglu Atac
Miguel-Sanchez J.
Weiss Kathrina M.
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