Spatio-temporal coherence in vertically emitting GaAs-based electrically driven polariton lasers
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We report on the implementation of a GaAs-based, vertically emitting electrically pumped polariton laser operated at cryogenic temperatures. The structure consists of a high quality factor AlGaAs/AlAs microcavity (Q=15 000) with two stacks of four GaAs quantum wells and features a Rabi splitting of 11 meV. Polariton lasing manifests by a clear threshold in the input–output characteristics of our device with a sharp drop in the emission linewidth and a continuous blueshift of 0.7 meV above threshold with increasing injection current. We measure spatial and temporal coherence of our device in the condensed phase by utilizing interference spectroscopy. Our results clearly demonstrate that electrically driven polariton lasers have promise as monolithic polaritonic sources of coherent light.
Suchomel , H , Klaas , M , Betzold , S , Gagel , P , Beierlein , J , Klembt , S , Schneider , C & Höfling , S 2020 , ' Spatio-temporal coherence in vertically emitting GaAs-based electrically driven polariton lasers ' , Applied Physics Letters , vol. 116 , no. 17 , 171103 . https://doi.org/10.1063/5.0007456
Applied Physics Letters
Copyright © 2020 The Author(s). Published by AIP Publishing. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1063/5.0007456
DescriptionAuthors gratefully acknowledge the financial support by the state of Bavaria, the DFG within the projects Schn1376-3.1 as well as KL3124/2-1 and the Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter - ct.qmat. S.H. is grateful for funding received within the EPSRC Hybrid Polaritonics programme grant (EP/M025330/1).
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