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

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.

Afiliação

Dai Z; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA.
Gao Z; Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Pershoguba SS; Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, China.
Tiwale N; Department of Physics and Astronomy and Materials Science Program, University of New Hampshire, Durham, New Hampshire 03824, USA.
Subramanian A; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA.
Zhang Q; Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, USA.
Eads C; Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Tenney SA; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA.
Osgood RM; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA.
Nam CY; Department of Electrical Engineering, Columbia University, New York, New York 10027, USA.
Zang J; Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA.
Johnson ATC; Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, USA.
Sadowski JT; Department of Physics and Astronomy and Materials Science Program, University of New Hampshire, Durham, New Hampshire 03824, USA.

Phys Rev Lett ; 127(8): 086805, 2021 Aug 20.

Article em En | MEDLINE | ID: mdl-34477425

ABSTRACT

ABSTRACT

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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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Estados Unidos

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