Magic Angle Spectroscopy

Understand

The electronic properties of heterostructures of atomically-thin van der Waals (vdW) crystals can be modified substantially by Moir\'e superlattice potentials arising from an interlayer twist between crystals.

• Moir\'e-tuning of the band structure has led to the recent discovery of superconductivity and correlated insulating phases in twisted bilayer graphene (TBLG) near the so-called "magic angle" of $\sim$1.1{\deg}, with a phase diagram reminiscent of high T$_c$ superconductors.
• However, lack of detailed understanding of the electronic spectrum and the atomic-scale influence of the Moir\'e pattern has so far precluded a coherent theoretical understanding of the correlated states.
• Here, we directly map the atomic-scale structural and electronic properties of TBLG near the magic angle using scanning tunneling microscopy and spectroscopy (STM/STS).