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Title: Optically induced topological spin-valley Hall effect for exciton polaritons
Authors: Banerjee, R.
Mandal, S.
Liew, Timothy Chi Hin
Keywords: Science::Physics
Issue Date: 2021
Source: Banerjee, R., Mandal, S. & Liew, T. C. H. (2021). Optically induced topological spin-valley Hall effect for exciton polaritons. Physical Review B, 103(20).
Project: MOE2019-T2-1-004
Journal: Physical Review B
Abstract: We consider exciton-polaritons in a honeycomb lattice of micropillars subjected to circularly polarized (σ±) incoherent pumps, which are arranged to form two domains in the lattice. We predict that the nonlinear interaction between the polaritons and the reservoir excitons gives rise to the topological valley Hall effect where in each valley two counterpropagating helical edge modes appear. Under a resonant pump, σ± polaritons propagate in different directions without being reflected around bends. The polaritons propagating along the interface have extremely high effective lifetimes and show fair robustness against disorder. This paves the way for robust exciton-polariton spin separating and transporting channels in which polaritons attain and maintain high degrees of spin polarization, even in the presence of spin relaxation.
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.103.L201406
Rights: © 2021 American Physical Society (APS). All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society (APS).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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