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Topological polaritons in a quantum spin Hall cavity

Janot, Alexander and Rosenow, Bernd and Refael, Gil (2016) Topological polaritons in a quantum spin Hall cavity. Physical Review B, 93 (16). Art. No. 161111. ISSN 2469-9950. doi:10.1103/PhysRevB.93.161111.

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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.

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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.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Leipzig School of Natural Sciences BuildMoNaUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)RO 2247/7-1
Deutsche Forschungsgemeinschaft (DFG)RO 2247/8-1
Institute of Quantum Information and Matter (IQIM)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:16
Record Number:CaltechAUTHORS:20160525-140247002
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Official Citation:Topological polaritons in a quantum spin Hall cavity Alexander Janot, Bernd Rosenow, and Gil Refael Phys. Rev. B 93, 161111(R)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67357
Deposited By: Tony Diaz
Deposited On:26 May 2016 16:35
Last Modified:11 Nov 2021 00:31

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