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Published April 2016 | Published + Submitted + Supplemental Material
Journal Article Open

Topological polaritons in a quantum spin Hall cavity

Abstract

We study the topological structure of matter-light excitations, so-called polaritons, in a quantum spin Hall insulator coupled to photonic cavity modes. We identify a topological invariant in the presence of time reversal (TR) symmetry, and demonstrate the existence of a TR-invariant topological phase. We find protected helical edge states with energies below the lower polariton branch and characteristic uncoupled excitonic states, both detectable by optical techniques. Applying a Zeeman field allows us to relate the topological index to the double coverage of the Bloch sphere by the polaritonic pseudospin.

Additional Information

© 2016 American Physical Society. Received 18 February 2015; revised manuscript received 30 September 2015; published 19 April 2016. We thank T. Karzig and H.-G. Zirnstein for discussions. A.J. is supported by the Leipzig School of Natural Sciences BuildMoNa. B.R. would like to acknowledge DFG Grants No. RO 2247/7-1 and No. RO 2247/8-1, and G.R. acknowledges NSF Grant No. DMR 1410435, as well as the Institute of Quantum Information and Matter, an NSF center supported by the Gordon and Betty Moore Foundation.

Attached Files

Published - PhysRevB.93.161111.pdf

Submitted - 1501.04092v2.pdf

Supplemental Material - SM_QSHC.pdf

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August 20, 2023
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