Exciton-polaritons in van der Waals heterostructures embedded in tunable microcavities.
Del Pozo-Zamudio, O
Nature Publishing Group
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Layered materials can be assembled vertically to fabricate a new class of van der Waals heterostructures a few atomic layers thick, compatible with a wide range of substrates and optoelectronic device geometries, enabling new strategies for control of light-matter coupling. Here, we incorporate molybdenum diselenide/hexagonal boron nitride (MoSe2/hBN) quantum wells in a tunable optical microcavity. Part-light-part-matter polariton eigenstates are observed as a result of the strong coupling between MoSe2 excitons and cavity photons, evidenced from a clear anticrossing between the neutral exciton and the cavity modes with a splitting of 20 meV for a single MoSe2 monolayer, enhanced to 29 meV in MoSe2/hBN/MoSe2 double-quantum wells. The splitting at resonance provides an estimate of the exciton radiative lifetime of 0.4 ps. Our results pave the way for room-temperature polaritonic devices based on multiple-quantum-well van der Waals heterostructures, where polariton condensation and electrical polariton injection through the incorporation of graphene contacts may be realized.
We thank the financial support of the EPSRC Programme Grant EP/J007544/1 and grant EP/M012727/1, Graphene Flagship, FP7 ITN S3NANO and ERC grant EXCIPOL 320570. O.D.P.-Z. thanks CONACYT-Mexico. A.A.P.T. and J.M.S. acknowledge support from the Leverhulme Trust. F.W. acknowledges support from the Royal Academy of Engineering and K.S.N. from US Army Research Office, the Royal Society and ERC grant Hetero2D. A.N. thanks the support of the EPSRC grant EP/K007173/1. We thank S. Altes for preparing the image of the tunable cavity.
This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record.
Vol. 6: 8579
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