Capturing 3D atomic defects and phonon localization at the 2D heterostructure interface.

Autor:	Tian X; Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.; Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China., Yan X; Department of Materials Science and Engineering, University of California, Irvine, Irvine, CA 92697, USA.; Irvine Materials Research Institute, University of California, Irvine, Irvine, CA 92697, USA., Varnavides G; Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.; Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.; Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA., Yuan Y; Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA., Kim DS; Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA., Ciccarino CJ; Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.; Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA., Anikeeva P; Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.; Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA., Li MY; Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia., Li LJ; Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong., Narang P; Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA., Pan X; Department of Materials Science and Engineering, University of California, Irvine, Irvine, CA 92697, USA.; Irvine Materials Research Institute, University of California, Irvine, Irvine, CA 92697, USA.; Department of Physics and Astronomy, University of California, Irvine, Irvine, CA 92697, USA., Miao J; Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.
Jazyk:	angličtina
Zdroj:	Science advances [Sci Adv] 2021 Sep 17; Vol. 7 (38), pp. eabi6699. Date of Electronic Publication: 2021 Sep 15.
DOI:	10.1126/sciadv.abi6699
Abstrakt:	The three-dimensional (3D) local atomic structures and crystal defects at the interfaces of heterostructures control their electronic, magnetic, optical, catalytic, and topological quantum properties but have thus far eluded any direct experimental determination. Here, we use atomic electron tomography to determine the 3D local atomic positions at the interface of a MoS 2 -WSe 2 heterojunction with picometer precision and correlate 3D atomic defects with localized vibrational properties at the epitaxial interface. We observe point defects, bond distortion, and atomic-scale ripples and measure the full 3D strain tensor at the heterointerface. By using the experimental 3D atomic coordinates as direct input to first-principles calculations, we reveal new phonon modes localized at the interface, which are corroborated by spatially resolved electron energy-loss spectroscopy. We expect that this work will pave the way for correlating structure-property relationships of a wide range of heterostructure interfaces at the single-atom level.
Databáze:	MEDLINE
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