Gate-defined Kondo lattices with valley-helical quantum dot arrays

Abstract

Kondo physics and heavy-fermion behavior have been predicted and observed in moiré materials. The electric tunability of moiré materials allows an in-situ study of Kondo lattices' phase diagrams, which is not possible with their intermetallic counterparts. However, moiré platforms rely on twisting, which introduces twisting angle disorder and undesired buckling. Here we propose device layouts for one- and two-dimensional gate-defined superlattices in Bernal bilayer graphene where localized states couple to dispersive valley-helical modes. 16We show that, under electronic interactions, these superlattices are described by an electrically-tunable Kondo-Heisenberg model.

16 pages, 6 figures

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