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Double-edged role of interactions in superconducting twisted bilayer graphene - Nature Physics
- New results show superconductivity in twisted bilayer graphene fades as dielectric constant rises near SrTiO3, indicating strong environmental control.
- Researchers link pairing to Coulomb interactions screened by plasmons, electron–hole pairs, and acoustic phonons in the moiré system.
- The study compares magic-angle and larger-angle devices, showing the dielectric environment governs superconducting behavior across samples.
- The authors highlight a double-edged role of electronic interactions and environment in superconductivity.
- The experimental setup involved tuning devices D1 and D2 at millikelvin temperatures to map Tc and Bc under varying gates.
- The work provides a qualitative match between experiments and a self-consistent Hartree–Fock theoretical model.
- Authors note data and code availability upon reasonable request to support findings.
- Key references include work on correlated insulators and unconventional superconductivity in magic-angle graphene, underpinning the study's context.
- Researchers acknowledge funding and collaborative support from multiple institutions across the US, Spain, and Japan.
- The paper emphasizes the 'double-edged' influence of environment on superconductivity and insulating states.
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