SKM 2021 – scientific programme
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DS: Fachverband Dünne Schichten
DS 11: 2D semiconductors and van der Waals heterostructures II (joint session HL/DS)
DS 11.1: Talk
Friday, October 1, 2021, 13:30–13:45, H4
Femtosecond contact-free nanoscopy of ultrafast interlayer transport in 2D heterostructures — •Felix Schiegl1, Markus Plankl1, Paulo Eduardo Faria Junior1, Fabian Mooshammer1, Tom Siday1, Martin Zizlsperger1, Fabian Sandner1, Simon Maier1, Markus Andreas Huber1, Martin Gmitra1,4, Jaroslav Fabian1, Jessica Louise Boland1,2, Tyler Liam Cocker1,3, and Rupert Huber1 — 1Department of Physics and Regensburg Center for Ultrafast Nanoscopy (RUN), University of Regensburg, Regensburg, Germany — 2Photon Science Institute, Department of Electrical and Electronic Engineering, University of Manchester, Manchester, UK — 3Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA — 4Institute of Physics, Pavol Jozef Šafárik University in Košice, Košice, Slovakia
Tunneling is one of the most direct results of quantum mechanics, and a hallmark of interlayer exciton formation in semiconducting van der Waals heterostructures. Here, we introduce a new contact-free terahertz nanoscopy technique to trace ultrafast charge dynamics in both conducting and non-conducting materials. We demonstrate < 50 nm spatial and subcycle temporal resolution and probe the interlayer tunneling across an atomically sharp WSe2/WS2 interface. Pronounced variations of the formation and annihilation of excitons emerge as a direct result of nanoscale strain and changes in atomic registry. Our results show the potential of this technique for revealing how ultrafast tunneling shapes the functionalities of a broad range of condensed matter systems.