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This is an overview of the new physics that emerges in van der Waals heterostructures consisting of graphene and hexagonal boron nitride, including the integer and fractional quantum Hall effects, novel plasmonic states and the effects of emergent moiré superlattices.
High harmonic spectroscopy is a femtosecond laser technique that reveals details of valence electron orbital wavefunctions in gas-phase molecules. It makes it possible to image molecular orbitals and for unimolecular chemical reactions to be followed with femtosecond resolution.
Magnetic topological insulators enable the investigation of the interplay between magnetism and topological electronic states. This Review summarizes the basic notions of magnetic topological insulators and the progress in the experimental realization of exotic topological phenomena.
Light–matter coupling with strength comparable to the bare transition frequencies of the system is called ultrastrong. This Review surveys how experiments have realized ultrastrong coupling in the past decade, the new phenomena predicted in this regime and the applications it enables.
