Kavli Affiliate: Jie Shan
| First 5 Authors: Yichi Zhang, Yichi Zhang, , ,
| Summary:
Tunable Kondo lattice and heavy fermion physics have been recently reported
in moir’e materials, but most of the studies have focused on the electrical
and magnetic properties. Quantitative thermoelectric measurements, which can
reveal entropic information of the heavy fermions, have yet to be achieved.
Here, we report a comprehensive thermoelectric study on the moir’e heavy
fermion phase realized in hole-doped angle-aligned MoTe2/WSe2 bilayers. By
electrically gating the material to the Kondo lattice region of the phase
diagram, we observe a sign change in the Seebeck coefficient near the Kondo
coherence temperature, where the heavy fermion phase with an electron-like
Fermi surface evolves into an itinerant Fermi liquid with a hole-like Fermi
surface. We compare the results with the semiclassical Mott relation and
discuss the observed discrepancies. In addition to the thermal dissociation of
Kondo singlets in the heavy Fermi liquid, a sign change accompanied by a strong
peak in the Seebeck coefficient is also observed near a Zeeman breakdown of the
Kondo singlets, signaling an entropy accumulation. Our results provide entropic
information on both the formation and breakdown of heavy fermions in moir’e
semiconductors.
| Search Query: ArXiv Query: search_query=au:”Jie Shan”&id_list=&start=0&max_results=3