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Several research groups have reported on the observation of superconductivity in bilayer graphene structures where single atomic layers of graphene are stacked and then twisted at angles θ forming Moiré superlattices. The characterization of the superc
These graphene bilayer devices are remarkably tunable. For example, by applying electric fields, we can add or remove electrons from the bilayer as well as push them toward and away from tungsten diselenide. This allowed us to carefully study the enhancement of superconductivity in the system. Ste...
石墨烯超导又有重大发现 | 近日,上海交通大学物理与天文学院李听昕课题组、李政道研究所刘晓雪课题组在Nature上发表题为“Tunable superconductivity in electron- and hole-doped Bernal bilayer graphene”的研究论文。该项研究首次在单晶石墨烯中观测到电子掺杂情况的超导电性,这对于理解晶体石墨烯及转角石墨烯系统的...
We present a theory of phonon-mediated superconductivity in near magic angle twisted bilayer graphene. Using a microscopic model for phonon coupling to moire band electrons, we find that phonons generate attractive interactions in both s- and d-wave pairing channels and that the attraction is strong...
superconductivity in 2D NbSe2: stronger CDW leads to lower NF, which further weakens superconductivity. We note that the experimental Tc shows a much more marked decrease from bilayer to monolayer, which is expected to arise from not only thechangeof NF but also other factors such as the ...
Monolayer NbSe2 is grown on bilayer graphene by molecular beam epitaxy and capped with a selenium film to avoid degradation in air. The selenium capped samples have TC = 1.9 K. In situ measurements down to 4 K in ultrahigh vacuum show that the effect of the selenium layer on the transport...
In particular, only alternating twisted stacking geometries of bilayer and trilayer graphene are found to exhibit robust superconductivity manifesting as zero resistance and Fraunhofer interference patterns. Here we demonstrate that magic-angle twisted tri-, quadri-, and pentalayers placed on monolayer ...
d+id' Chiral Superconductivity in Bilayer Silicene We investigate the structure and physical properties of the undoped bilayer silicene (BLS). Our first principle (FP) calculations reveal that the band structure of the system with Dsymmetry is intrinsically metallic with pocket Fermi sur... F Yang...
The emergence of superconductivity and correlated insulators in magic-angle twisted bilayer graphene (MATBG) has raised the intriguing possibility that its pairing mechanism is distinct from that of conventional superconductors, as described by the Bardeen鈥揅ooper鈥揝chrieffer (BCS) theory. However, ...