Magnetoresistance of the 2D heavy fermion system CeSiI

The verification of the 2D electronic system and the inherent layered structure of CeSiI makes 2D transport an exciting avenue to explore the effect of dimensionality on its heavy fermion behavior. With the air sensitivity exhibited by bulk crystals, exfoliated flakes are more reactive and because of this device fabrication is extremely complex. We report electrical transport and Raman spectroscopy of atomically thin CeSiI. The temperature dependence of the resistance displays similar characteristics of the bulk single crystal measurement with an antiferromagnetic transition at ~7 K and the Kondo lattice formation at ~40 K with quadratic temperature dependance between 10 K to 25 K. The temperature dependent MR and Hall resistance exhibits sharp kinks near the metamagnetic transitions (4 - 5 T). The Hall resistance vs magnetic field also suggest a gradual formation of new transport channel with different carrier sign. Heavy fermion metals can be host of exotic quantum phenomena such as Kondo lattice, unconventional superconductivity and quantum criticality. Our study of atomically thin 2D heavy fermion system provides a new route to explore low dimensional strongly correlated systems.