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HL: Fachverband Halbleiterphysik
HL 27: 2D semiconductors and van der Waals heterostructures III (joint session HL/DS)
HL 27.9: Vortrag
Dienstag, 17. März 2020, 12:15–12:30, POT 81
Interlayer excitons in pristine bilayer MoS2 with strong oscillator strength — •Etienne Lorchat1, Maximilian Waldherr1, Sefaattin Tongay2, Takashi Taniguchi3, Kenji Watanabe3, Christian Schneider1, and Sven Höfling1 — 1Technische Physik and Wilhelm Conrad RöntgenResearch Center for Complex Material Systems, Physikalisches Institut, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States — 3National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
In the high density limit, the interaction between electrons in a 2D electron gas (2DEG) and excitons in Transition Metal Dichalcogenide (TMD) are predicted to yield a new, unconventional superconductive phase via excitonic cooper pairing. However, this interaction only gets notable if exciton aquires an out of plane dipole to interact with the 2DEG as well as an in-plane dipole to be easily excited with light. The commonly studied excitons in TMD monolayers or heterobilayers present solely one type of the dipole. Among the various approach, we will present here the hybrid interlayer exciton in MoS2. Using field-dependent photoluminescence spectroscopy as well as reflectivity we will demonstrate the emergence of an excitonic resonance, which combines a static dipole moment with a significant oscillator strength.