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HL: Fachverband Halbleiterphysik
HL 2: 2D Materials and Heterostructures: Photonic Aspects
HL 2.9: Talk
Monday, March 18, 2024, 11:45–12:00, EW 201
Spectrally and topologically tunable polaritons based on two-dimensional crystals in a photonic lattice — Lukas Lackner1, Christoph Bennenhei1, Oleg Egorov2, Anthony Enzerhof1, Victor Mitryakhin1, Falk Eilenberger2, Sefaattin Tongay3, •Martin Esmann1, and Christian Schneider1 — 1Carl von Ossietzky University, Oldenburg, Germany — 2Friedrich Schiller University, Jena, Germany — 3Arizona State University, Tempe, Arizona, USA
Engineering hybrid light-matter states in tailored photonic lattices is a key asset for the emulation of topological Hamiltonians interlinking fundamental aspects of photonics, information processing and solid state physics. Room temperature-stable excitons in atomically thin crystals are an ideal active medium for this purpose, since they couple strongly to light and bear the potential to harness giant non-linearities. Here, we study spectrally tunable exciton-polaritons of a WS2 monolayer in a high quality open cavity at room temperature [1]. We imprint a photonic lattice into the cavity, which emulates the canonical Su-Schrieffer-Heeger (SSH) Hamiltonian [2] and generate a topological mode at a domain boundary between two lattices characterized by different topological invariants. Our optical experiments reveal a spectral tunability of the topologically protected mode over a range as large as 80 meV. Utilizing the unique tilt-tunability of our implementation, we transform the SSH-lattice into a Stark-ladder and fundamentally change its topological class.
[1] L. Lackner et al., Nat Commun 12, 4933 (2021)
[2] W. P. Su et al. PRL 42, 1698 (1979)
Keywords: WS2; open cavity; Su-Schrieffer-Heeger; topology; photonic lattice