Chiral Kondo lattice in doped MoTe 2 /WSe 2 bilayers

• DOI: 10.1126/sciadv.ade7701
• Publication Date: 2023-03-17T17:58:19Z
• Authors: Daniele Guerci; Jie Wang; Jiawei Zang; Jennifer Cano; J. H. Pixley; Andrew Millis
• Keywords: Condensed Matter - Strongly Correlated Electrons; Condensed Matter - Mesoscale and Nanoscale Physics; Strongly Correlated Electrons (cond-mat.str-el); 0103 physical sciences; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); FOS: Physical sciences; Physical and Materials Sciences; 01 natural sciences

We theoretically study the interplay between magnetism and a heavy Fermi liquid in the AB-stacked transition metal dichalcogenide bilayer system, MoTe 2 /WSe 2 , in the regime in which the Mo layer supports localized magnetic moments coupled by interlayer electron tunneling to a weakly correlated band of itinerant electrons in the W layer. We show that the interlayer electron transfer leads to a chiral Kondo exchange, with consequences including a strong dependence of the Kondo temperature on carrier concentration and anomalous Hall effect due to a topological hybridization gap. The theoretical model exhibits two phases, a small Fermi surface magnet and a large Fermi surface heavy Fermi liquid; at the mean-field level, the transition between them is first order. Our results provide concrete experimental predictions for ongoing experiments on MoTe 2 /WSe 2 bilayer heterostructures and introduces a controlled route to observe a topological selective Mott transition.