Quantum-Well Bound States in Graphene Heterostructure Interfaces

Dai, Zhongwei; Gao, Zhaoli; Pershoguba, Sergey S.; Tiwale, Nikhil; Subramanian, Ashwanth; Zhang, Qicheng; Eads, Calley; Tenney, Samuel A.; Osgood, Richard M.; Nam, Chang-Yong; Zang, Jiadong; Johnson, A. T. Charlie; Sadowski, Jerzy T.

doi:10.1103/physrevlett.127.086805

Title: Quantum-Well Bound States in Graphene Heterostructure Interfaces

Journal Article · 20 August 2021 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.127.086805 · OSTI ID:1817199

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^[2]; Pershoguba, Sergey S. ^[3];

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^[4]; Zhang, Qicheng ^[5]; Eads, Calley ^[1];

^[1]; Osgood, Richard M. ^[6];

^[7]; Zang, Jiadong ^[3];

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Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Physics and Astronomy; Chinese Univ. of Hong Kong (China). Dept. of Biomedical Engineering
Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Physics and Astronomy, Materials Science Program
Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering
Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Physics and Astronomy
Columbia Univ., New York, NY (United States). Dept. of Electrical Engineering
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN); Stony Brook Univ., NY (United States). Dept. of Materials Science and Chemical Engineering

We present experimental evidence of electronic and optical interlayer resonances in graphene van der Waals heterostructure interfaces. Using the spectroscopic mode of a low-energy electron microscope (LEEM), we characterized these interlayer resonant states up to 10 eV above the vacuum level. Compared with nontwisted, AB-stacked bilayer graphene (AB BLG), an ≈ 0.2 Å increase was found in the interlayer spacing of 30° twisted bilayer graphene (30°-tBLG). In addition, we used Raman spectroscopy to probe the inelastic light-matter interactions. A unique type of Fano resonance was found around the D and G modes of the graphene lattice vibrations. This anomalous, robust Fano resonance is a direct result of quantum confinement and the interplay between discrete phonon states and the excitonic continuum.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1817199

Report Number(s):: BNL--222036-2021-JAAM

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 127; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Raman spectroscopy
electronic structure
graphene
heterostructures
low-energy electron microscopy

Title: Quantum-Well Bound States in Graphene Heterostructure Interfaces

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