Kenjiro K. Gomes

TL;DR: This work reports the emergence of Dirac fermions in a fully tunable condensed-matter system—molecular graphene—assembled by atomic manipulation of carbon monoxide molecules over a conventional two-dimensional electron system at a copper surface and shows the existence within the system of linearly dispersing, massless quasi-particles accompanied by a density of states characteristic of graphene.

TL;DR: The first spatially resolved measurements of gap formation in a high-Tc superconductor are reported, measuring on Bi2Sr2CaCu2O8+δ samples with different Tc values using scanning tunnelling microscopy and finding that every pairing gap develops locally at a temperature Tp, following the relation 2Δ/kBTp = 7.5.

TL;DR: The measurements reveal that the strength of pairing is determined by the unusual electronic excitations of the normal state, suggesting that strong electron-electron interactions rather than low-energy (<0.1 volts) electron-boson interactions are responsible for superconductivity in the cuprates.

TL;DR: High-resolution scanning tunneling microscopy measurements of the high–transition temperature (Tc) superconductor Bi2Sr2CaCu2O8+δ show that samples with different Tc values in the low doping regime follow a remarkably universal d wave low-energy excitation spectrum, indicating a doping-independent nodal gap.

TL;DR: In this paper, angle-resolved photo-emission spectroscopic study of the high-Tc$ superconductor class was performed using a photon-energy-modulation contrast and scattering geometry.