Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductor

Nils Lundt, Łukasz Dusanowski, Evgeny Sedov, Petr Stepanov, Mikhail M. Glazov, Sebastian Klembt, Martin Klaas, Johannes Beierlein, Ying Qin, Sefaattin Tongay, Maxime Richard, Alexey V. Kavokin, Sven Höfling, Christian Schneider

Результат исследований: Научные публикации в периодических изданияхстатья

6 Цитирования (Scopus)

Аннотация

Spin–orbit coupling is a fundamental mechanism that connects the spin of a charge carrier with its momentum. In the optical domain, an analogous synthetic spin–orbit coupling is accessible by engineering optical anisotropies in photonic materials. Both yield the possibility of creating devices that directly harness spin and polarization as information carriers. Atomically thin transition metal dichalcogenides promise intrinsic spin-valley Hall features for free carriers, excitons and photons. Here we demonstrate spin- and valley-selective propagation of exciton-polaritons in a monolayer of MoSe2 that is strongly coupled to a microcavity photon mode. In a wire-like device we trace the flow and helicity of exciton-polaritons expanding along its channel. By exciting a coherent superposition of K and K′ tagged polaritons, we observe valley-selective expansion of the polariton cloud without either an external magnetic field or coherent Rayleigh scattering. The observed optical valley Hall effect occurs on a macroscopic scale, offering the potential for applications in spin-valley-locked photonic devices.

Язык оригиналаанглийский
Страницы (с-по)770-775
Число страниц6
ЖурналNature Nanotechnology
Том14
Номер выпуска8
DOI
СостояниеОпубликовано - 1 авг 2019

Предметные области Scopus

  • Биоинженерия
  • Атомная и молекулярная физика и оптика
  • Биомедицинская техника
  • Материаловедение (все)
  • Физика конденсатов
  • Электротехника и электроника

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  • Цитировать

    Lundt, N., Dusanowski, Ł., Sedov, E., Stepanov, P., Glazov, M. M., Klembt, S., Klaas, M., Beierlein, J., Qin, Y., Tongay, S., Richard, M., Kavokin, A. V., Höfling, S., & Schneider, C. (2019). Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductor. Nature Nanotechnology, 14(8), 770-775. https://doi.org/10.1038/s41565-019-0492-0