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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
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Superconductivity in twisted double bilayer graphene stabilized by WSe2
Ruiheng Su1,2, Manabendra Kuiri1,2, Kenji Watanabe3
1Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia, Canada.
Nature Materials
|August 28, 2023
Summary
Superconductivity was discovered in twisted double bilayer graphene (TDBG) near WSe2. This finding advances understanding of unconventional superconductivity in two-dimensional materials.
Area of Science:
- Condensed-matter physics
- Two-dimensional materials research
- Superconductivity
Background:
- Unconventional superconductivity in graphene-based systems is not fully understood.
- Superconductivity observed in twisted monolayer graphene but not bilayer graphene.
- Both systems exhibit topological flat bands and symmetry-broken states.
Purpose of the Study:
- To investigate superconductivity in twisted double bilayer graphene (TDBG).
- To identify essential components for superconductivity in graphene systems.
Main Methods:
- Fabrication of twisted double bilayer graphene (TDBG) samples.
- Proximity to WSe2.
- Electrical transport measurements across varying twist angles and gate tuning.
Main Results:
- Superconductivity observed in TDBG at twist angles 1.24° and 1.37°.
- Superconducting pockets found in both valence and conduction bands.
- Emergence of superconductivity from unpolarized phases near van Hove singularities and isospin symmetry breaking.
Conclusions:
- A high density of states correlates with superconductivity in TDBG.
- Isospin fluctuations may play a role in superconductivity pairing.
- Discovery offers new avenues for exploring unconventional superconductivity.
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