Quantum-Well Bound States in Graphene Heterostructure Interfaces

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

doi:10.1103/PhysRevLett.127.086805

Quantum-Well Bound States in Graphene Heterostructure Interfaces

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

Materials Science and Engineering

Brookhaven National Laboratory
University of Pennsylvania
Chinese University of Hong Kong
University of New Hampshire
Stony Brook University
Columbia University

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

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.

Original language	English
Article number	086805
Journal	Physical Review Letters
Volume	127
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.127.086805
State	Published - Aug 20 2021

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10.1103/PhysRevLett.127.086805

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title = "Quantum-Well Bound States in Graphene Heterostructure Interfaces",

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 {\AA} 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.",

author = "Zhongwei Dai and Zhaoli Gao and Pershoguba, \{Sergey S.\} and Nikhil Tiwale and Ashwanth Subramanian and Qicheng Zhang and Calley Eads and Tenney, \{Samuel A.\} and Osgood, \{Richard M.\} and Nam, \{Chang Yong\} and Jiadong Zang and Johnson, \{A. T.Charlie\} and Sadowski, \{Jerzy T.\}",

note = "Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = aug,

day = "20",

doi = "10.1103/PhysRevLett.127.086805",

language = "English",

volume = "127",

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TY - JOUR

T1 - Quantum-Well Bound States in Graphene Heterostructure Interfaces

AU - Dai, Zhongwei

AU - Gao, Zhaoli

AU - Pershoguba, Sergey S.

AU - Tiwale, Nikhil

AU - Subramanian, Ashwanth

AU - Zhang, Qicheng

AU - Eads, Calley

AU - Tenney, Samuel A.

AU - Osgood, Richard M.

AU - Nam, Chang Yong

AU - Zang, Jiadong

AU - Johnson, A. T.Charlie

AU - Sadowski, Jerzy T.

PY - 2021/8/20

Y1 - 2021/8/20

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85113665638

U2 - 10.1103/PhysRevLett.127.086805

DO - 10.1103/PhysRevLett.127.086805

M3 - Article

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AN - SCOPUS:85113665638

SN - 0031-9007

VL - 127

JO - Physical Review Letters

JF - Physical Review Letters

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ER -

Quantum-Well Bound States in Graphene Heterostructure Interfaces

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