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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
Published on: October 12, 2019
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Gate-tunable plasmons in mixed-dimensional van der Waals heterostructures.
Sheng Wang1,2, SeokJae Yoo3,4, Sihan Zhao5
1Department of Physics, University of California at Berkeley, Berkeley, CA, USA. shengwang16@berkeley.edu.
Nature Communications
|August 20, 2021
Summary
Researchers observed gate-tunable hybrid plasmons in carbon nanotube-graphene structures. This 1D-2D hybrid system shows significant plasmon modulation, paving the way for novel tunable plasmonic nanodevices.
Area of Science:
- Nanoscale science
- Condensed matter physics
- Plasmonics
Background:
- Surface plasmons are crucial for nanoscale light-matter interactions.
- Plasmon dispersion is sensitive to material dimensionality, with extensive study for fundamental and applied research.
Purpose of the Study:
- To investigate evidence for gate-tunable hybrid plasmons in a mixed-dimensional heterostructure.
- To explore the coupling between one-dimensional (1D) carbon nanotubes and two-dimensional (2D) graphene for plasmonics.
Main Methods:
- Fabrication and characterization of 1D carbon nanotube and 2D graphene heterostructures.
- Electromagnetic modeling to understand plasmon interactions and hybridization.
Main Results:
- Observed significant modulation (75%) of plasmon wavelengths via electrostatic gating in the 1D-2D heterostructure.
- Demonstrated carrier density-dependent plasmon behavior, unlike bare 1D carbon nanotubes.
- Retained high figures of merit characteristic of 1D plasmons.
Conclusions:
- Hybrid plasmons arising from dimensionally mixed coupling are proposed as the mechanism for large plasmon modulation.
- The developed theoretical model explains the observed electromagnetic interactions.
- Mixed-dimensional plasmonic heterostructures offer potential for designing tunable nanodevices.
