Nonresonant spin selection methods and polarization control in exciton-polariton condensates
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Bosonic condensates of exciton-polaritons are characterized by a well-defined pseudospin, which makes them attractive for quantum information schemes and spintronic applications, as well as the exploration of synthetic spin-orbit coupling. However, precise polarization control of coherent polariton condensates under nonresonant injection, the most important ingredient for such advanced studies, still remains a core challenge. Here, we address this problem and demonstrate unprecedented control of the pseudospin of an exciton-polariton condensate. The ultrafast stimulated scattering process allows the observation of completely spin-polarized condensates under highly nonresonant, circularly polarized excitation. This conservation of spin population translates, in the case of linearly polarized excitation, into an elliptically polarized emission. The degree of ellipticity can be controlled by varying the exciton-photon detuning and condensate density. Additionally, cavity engineering allows us to generate completely linearly polarized condensates with a deterministically chosen orientation. Our findings are of fundamental importance for the engineering and design of polaritonic devices that harness the spinor degree of freedom, such as chiral lasers, spin switches, and polaritonic topological insulator circuits.
Klass , M , Egorov , O A , Liew , T C H , Nalitov , A , Marković , V , Harder , T H , Betzold , S , Ostrovskaya , E A , Kavokin , A , Höfling , S & Schneider , C 2019 , ' Nonresonant spin selection methods and polarization control in exciton-polariton condensates ' , Physical Review. B, Condensed matter and materials physics , vol. 99 , no. 11 , 115303 . https://doi.org/10.1103/PhysRevB.99.115303
Physical Review. B, Condensed matter and materials physics
Copyright © 2019 American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version 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/10.1103/PhysRevB.99.115303
DescriptionThe authors would like to thank the State of Bavaria and the german research association (DFG) within the DFG project Schn1376 3-1 for financial support. E.A.O. acknowledges support by the Australian Research Council (ARC). A.N. acknowledges support from Icelandic Research Fund, Grant No. 196301-051 and from Russian Science Foundation, Grant No. 18-72-10110. T.H.H. gratefully acknowledges support by the Elite Network Bavaria within the doctoral training programme “Topological Insulators” (Tols 836315). Sample growth by S. Brodbeck, and technology support by M. Emmerling and A. Wolf is acknowledged. C. S. acknowledges discussions with T. Kiessling. T.C.H.L. was supported by the Singapore Ministry of Education Academic Research Fund Tier 2, Project No. MOE2017-T2-1-001.
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