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

نویسندگان

  • 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
  • A I Tartakovskii
چکیده

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.

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عنوان ژورنال:

دوره 6  شماره 

صفحات  -

تاریخ انتشار 2015