Exciton–polaritons in van der Waals heterostructures embedded in tunable microcavities

S. Dufferwiel, S. Schwarz, F. Withers, A. A. P. Trichet, F. Li, M. Sich, O. Del Pozo-Zamudio, C. Clark, A. Nalitov, D. D. Solnyshkov, G. Malpuech, K. S. Novoselov, J. M. Smith, M. S. Skolnick, D. N. Krizhanovskii and A. I. Tartakovskii ()
Additional contact information
S. Dufferwiel: University of Sheffield
S. Schwarz: University of Sheffield
F. Withers: School of Physics and Astronomy, University of Manchester
A. A. P. Trichet: University of Oxford
F. Li: University of Sheffield
M. Sich: University of Sheffield
O. Del Pozo-Zamudio: University of Sheffield
C. Clark: Helia Photonics
A. Nalitov: Institut Pascal, Blaise Pascal University
D. D. Solnyshkov: Institut Pascal, Blaise Pascal University
G. Malpuech: Institut Pascal, Blaise Pascal University
K. S. Novoselov: School of Physics and Astronomy, University of Manchester
J. M. Smith: University of Oxford
M. S. Skolnick: University of Sheffield
D. N. Krizhanovskii: University of Sheffield
A. I. Tartakovskii: University of Sheffield

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms9579

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