We analyze the properties of flat-band superconductor junctions that behave differently from ordinary junctions containing only metals with Fermi surfaces. In particular, we show how in the tunneling limit the critical Josephson current between flat-band superconductors is inversely proportional to...

A quantum twisting microscope (QTM) enables energy- and momentum-resolved measurements of quantum phases through tunneling spectroscopy in twistable van der Waals heterostructures. Here, we improve its resolution and extend its range to higher energies and twist angles by integrating hexagonal...

We present a numerical study of three-layer graphene heterostructures in which the layers are twisted by the magic angle (∼1.1∘) or by ∼30∘ to form a graphene quasicrystal. The heterostacks are described using realistic structural relaxations and tight-binding Hamiltonians, and their transport...

Two-dimensional (2D) materials have attracted significant interest due to their tunable physical properties when stacked into homo- and heterostructures. Twisting adjacent layers introduces moiré patterns that strongly influence the material’s electronic and thermal behavior. In twisted graphene systems, the twist...

While extensively studied in normal metals, semimetals, and semiconductors, the superconducting (SC) proximity effect remains elusive in the emerging field of flat-band systems. In this study, we probe proximity-induced superconductivity in Josephson junctions (JJs) formed between superconducting NbTiN electrodes and...

Post-transfer in-depth morphological characterization of graphene grown by chemical vapor deposition (CVD) is of great importance to evaluate the quality and to understand the origin of defects in the transferred sheets. Herein, a semi-dry transfer technique is used to peel...

We use a combination of molecular dynamics and quantum transport simulations to investigate the upper limit of spin transport in suspended graphene. We find that thermally-induced atomic-scale corrugations are the dominant factor, limiting spin lifetimes to 10 ns by inducing a strongly-varying local spin–orbit coupling....

Flat bands in moiré systems are exciting new playgrounds for the generation and study of exotic many-body physics phenomena in low-dimensional materials. Such physics is attributed to the vanishing kinetic energy and strong spatial localization of the flat-band states. Here,...

The ability to tune the energy gap in bilayer graphene makes it the perfect playground for the study of the effects of internal electric fields, such as the crystalline field, which are developed when other layered materials are deposited on...