Presentation Information
[2H04]Momentum-selective control of superconductivity in twisted NbSe2/graphene heterostructures
*Masahiro Naritsuka1 (1. Institute of Physical and Chemical Research (RIKEN))
Twist engineering in van der Waals superconductors presents a novel route for modulating superconductivity beyond traditional approaches via external fields or doping. Here, we study heterostructures composed of the monolayer superconductor NbSe2 and graphene, grown by molecular beam epitaxy with various twist angles. Using ultra-low-temperature spectroscopic-imaging scanning tunneling microscopy, we observe Bogoliubov quasiparticles confined within the superconducting gap, exhibiting spatial patterns that depend on the twist angle. A momentum-resolved analysis reveals that superconducting coherence is selectively weakened at wave vectors where the Fermi surfaces of graphene and NbSe2 overlap. These results demonstrate a momentum-selective suppression of the superconducting gap, controlled by the twist geometry, and establish a new principle for designing emergent superconducting states through tailored heterostructures.