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Quantum-Well Bound States in Graphene Heterostructure Interfaces
- Source :
- Physical Review Letters. 127
- Publication Year :
- 2021
- Publisher :
- American Physical Society (APS), 2021.
-
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 $\ensuremath{\approx}0.2\text{ }\text{ }\AA{}$ increase was found in the interlayer spacing of 30\ifmmode^\circ\else\textdegree\fi{} twisted bilayer graphene (30\ifmmode^\circ\else\textdegree\fi{}-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.
- Subjects :
- Physics
Condensed matter physics
Graphene
Phonon
General Physics and Astronomy
Fano resonance
02 engineering and technology
Type (model theory)
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
021001 nanoscience & nanotechnology
01 natural sciences
law.invention
law
Quantum dot
0103 physical sciences
Continuum (set theory)
010306 general physics
0210 nano-technology
Bilayer graphene
Quantum well
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 127
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi.dedup.....5886bf49fc575da219004d668aef7840
- Full Text :
- https://doi.org/10.1103/physrevlett.127.086805