Thermal transport in atomocally thin materials by the 3ω method

Quantum oscillations in the thermal conductance, quantized thermal Hall plateaus, and large phonon Hall conductances have been reported in bulk α-RuCl3, with competing interpretations of a bosonic or fermionic origin. Since α-RuCl3 is a layered material, thermal transport in thin exfoliated samples may provide new information, although the ~10-100 µm flake size makes for a challenging experiment. We are developing methods to measure thermal transport in suspended single- and few-layer thick films of atomically thin materials. Here we report progress toward demonstrating electronic methods to measure thermal transport in atomically thin materials, benchmarking against measurements of thin suspended silicon nitride sheets, and exfoliated hexagonal boron nitride down to the single layer limit.