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. https://resolver.caltech.edu/CaltechAUTHORS:20160525-140247002
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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.
Item Type: | Article | |||||||||||||||
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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 | |||||||||||||||
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Issue or Number: | 16 | |||||||||||||||
DOI: | 10.1103/PhysRevB.93.161111 | |||||||||||||||
Record Number: | CaltechAUTHORS:20160525-140247002 | |||||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20160525-140247002 | |||||||||||||||
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 | |||||||||||||||
Collection: | CaltechAUTHORS | |||||||||||||||
Deposited By: | Tony Diaz | |||||||||||||||
Deposited On: | 26 May 2016 16:35 | |||||||||||||||
Last Modified: | 11 Nov 2021 00:31 |
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