Topological charge density waves in MoTe2/WSe2 moiré superlattices

Transition metal dichalcogenide (TMD) semiconductor moiré system has been demonstrated as a versatile platform for studying exotic physics such as Hubbard physics and Kane-Mele physics. AB-stacked MoTe2/WSe2 moiré system has enabled both optical and transport studies and shown vivid phase diagram such as topological phase transition at filling 1. Here we report a new Chern state at fractional filling with well quantized Hall resistance and vanishing longitudinal resistance in AB-stacked MoTe2/WSe2. It is consistent with a topological charge density wave (CDW) state with spontaneously broken translational symmetry and a non-zero Chern number. Transport measurements further show that this topological CDW state is closely related to Kondo breakdown. More theoretical studies of the origin of this topological CDW state and the interplay between it and Kondo physics are needed.