This paper presents evidence of a coherent ground state in a 1T/1H-TaSe₂ heterobilayer, a two-dimensional Kondo lattice, using scanning tunneling microscopy/spectroscopy at 340 mK. The observation of two symmetric electronic resonances around the Fermi energy, along with their behavior under magnetic fields, suggests a ground state with magnetic order mediated by conduction electrons, inconsistent with a fully screened Kondo lattice. This finding opens avenues for exploring magnetic quantum criticality, Kondo breakdown transitions, and unconventional superconductivity in the two-dimensional limit.

Wen Wan, Rishav Harsh, Antonella Meninno, Paul Dreher, Sandra Sajan, Haojie Guo, Ion Errea, Fernando de Juan, Miguel M. Ugeda