Bidirectional phonon emission in two-dimensional heterostructures triggered by ultrafast charge transfer.

Autor: Sood A; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA. aditya.sood@princeton.edu.; Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA. aditya.sood@princeton.edu., Haber JB; Department of Physics, University of California Berkeley, Berkeley, CA, USA., Carlström J; Lawrence Berkeley National Laboratory, Berkeley, CA, USA., Peterson EA; Department of Physics, University of California Berkeley, Berkeley, CA, USA.; Lawrence Berkeley National Laboratory, Berkeley, CA, USA., Barre E; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.; Department of Applied Physics, Stanford University, Stanford, CA, USA., Georgaras JD; Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA., Reid AHM; SLAC National Accelerator Laboratory, Menlo Park, CA, USA., Shen X; SLAC National Accelerator Laboratory, Menlo Park, CA, USA., Zajac ME; Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA., Regan EC; Department of Physics, University of California Berkeley, Berkeley, CA, USA.; Lawrence Berkeley National Laboratory, Berkeley, CA, USA.; Graduate Group in Applied Science and Technology, University of California Berkeley, Berkeley, CA, USA., Yang J; SLAC National Accelerator Laboratory, Menlo Park, CA, USA., Taniguchi T; International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan., Watanabe K; Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan., Wang F; Department of Physics, University of California Berkeley, Berkeley, CA, USA., Wang X; SLAC National Accelerator Laboratory, Menlo Park, CA, USA., Neaton JB; Department of Physics, University of California Berkeley, Berkeley, CA, USA.; Lawrence Berkeley National Laboratory, Berkeley, CA, USA.; Kavli Energy NanoScience Institute, University of California Berkeley, Berkeley, CA, USA., Heinz TF; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.; Department of Applied Physics, Stanford University, Stanford, CA, USA., Lindenberg AM; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA. aaronl@stanford.edu.; Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA. aaronl@stanford.edu., da Jornada FH; Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA. jornada@stanford.edu., Raja A; Lawrence Berkeley National Laboratory, Berkeley, CA, USA. araja@lbl.gov.
Jazyk: angličtina
Zdroj: Nature nanotechnology [Nat Nanotechnol] 2023 Jan; Vol. 18 (1), pp. 29-35. Date of Electronic Publication: 2022 Dec 21.
DOI: 10.1038/s41565-022-01253-7
Abstrakt: Photoinduced charge transfer in van der Waals heterostructures occurs on the 100 fs timescale despite weak interlayer coupling and momentum mismatch. However, little is understood about the microscopic mechanism behind this ultrafast process and the role of the lattice in mediating it. Here, using femtosecond electron diffraction, we directly visualize lattice dynamics in photoexcited heterostructures of WSe 2 /WS 2 monolayers. Following the selective excitation of WSe 2 , we measure the concurrent heating of both WSe 2 and WS 2 on a picosecond timescale-an observation that is not explained by phonon transport across the interface. Using first-principles calculations, we identify a fast channel involving an electronic state hybridized across the heterostructure, enabling phonon-assisted interlayer transfer of photoexcited electrons. Phonons are emitted in both layers on the femtosecond timescale via this channel, consistent with the simultaneous lattice heating observed experimentally. Taken together, our work indicates strong electron-phonon coupling via layer-hybridized electronic states-a novel route to control energy transport across atomic junctions.
(© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
Externí odkaz: