Experimental Evidence for Nodal Superconducting Gap in Moiré Graphene
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Graphene Research
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Condensed Matter Physics
A new research paper presents experimental evidence for a nodal superconducting gap in moiré graphene, sparking interest and discussion among HN users about the findings and their implications.
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> Abstract: [...] Here, we report simultaneous tunneling spectroscopy and transport measurements of magic-angle twisted trilayer graphene. This approach allows us to identify two coexisting V-shaped tunneling gaps with different energy scales: a distinct low-energy superconducting gap that vanishes at the superconducting critical temperature and magnetic field, and a higher-energy pseudogap. The superconducting tunneling spectra display a linear gap-filling behavior with temperature and magnetic field and exhibit the Volovik effect, consistent with a nodal order parameter. Our work suggests an unconventional nature of the superconducting gap and establishes an experimental framework for multidimensional investigation of tunable quantum materials.