title: Exciton-polaritons in van der Waals heterostructures embedded in tunable microcavities.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK.
authors.forename: S
authors.initials: S
authors.lastname: Dufferwiel
authors.affiliation: Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK.
authors.forename: S
authors.initials: S
authors.lastname: Schwarz
authors.affiliation: School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.
authors.forename: F
authors.identifier: http://orcid.org/0000-0003-2638-0315
authors.initials: F
authors.lastname: Withers
authors.affiliation: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.
authors.forename: A A P
authors.initials: AA
authors.lastname: Trichet
authors.affiliation: Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK.
authors.forename: F
authors.initials: F
authors.lastname: Li
authors.affiliation: Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK.
authors.forename: M
authors.initials: M
authors.lastname: Sich
authors.affiliation: Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK.
authors.forename: O
authors.identifier: http://orcid.org/0000-0003-1107-3734
authors.initials: O
authors.lastname: Del Pozo-Zamudio
authors.affiliation: Helia Photonics, Livingston EH54 7EJ, UK.
authors.forename: C
authors.initials: C
authors.lastname: Clark
authors.affiliation: Institut Pascal, Blaise Pascal University, 24 avenue des Landais, 63177 Aubiére, France.|Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, UK.
authors.forename: A
authors.initials: A
authors.lastname: Nalitov
authors.affiliation: Institut Pascal, Blaise Pascal University, 24 avenue des Landais, 63177 Aubiére, France.
authors.forename: D D
authors.initials: DD
authors.lastname: Solnyshkov
authors.affiliation: Institut Pascal, Blaise Pascal University, 24 avenue des Landais, 63177 Aubiére, France.
authors.forename: G
authors.initials: G
authors.lastname: Malpuech
authors.affiliation: School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.
authors.forename: K S
authors.initials: KS
authors.lastname: Novoselov
authors.affiliation: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.
authors.forename: J M
authors.initials: JM
authors.lastname: Smith
authors.affiliation: Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK.
authors.forename: M S
authors.initials: MS
authors.lastname: Skolnick
authors.affiliation: Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK.
authors.forename: D N
authors.initials: DN
authors.lastname: Krizhanovskii
authors.affiliation: Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK.
authors.forename: A I
authors.identifier: http://orcid.org/0000-0002-4169-5510
authors.initials: AI
authors.lastname: Tartakovskii