Kondo breakdown transition in a gate-tuned moire Kondo lattice · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title
Kondo breakdown transition in a gate-tuned moire Kondo lattice
Plain · changed
Revision 1: In MoTe2/WSe2 one layer can hold fixed local magnetic moments while the other carries mobile electrons, and the two combine into a heavy-electron metal (a Kondo lattice); how this metal breaks apart when the coupling between layers is weakened is unknown.
Revision 2: In $\mathrm{MoTe_2}$/$\mathrm{WSe_2}$ one layer can hold fixed local magnetic moments while the other carries mobile electrons, and the two combine into a heavy-electron metal (a Kondo lattice); how this metal breaks apart when the coupling between layers is weakened is unknown.
Precise · changed · core
Revision 1: In MoTe2/WSe2 heterobilayers with the MoTe2 moire band at filling $\nu_f = 1$ (local moments) and the WSe2 band doped to density $n_c$ per moire cell, Zhao et al. (Nature, 2023, arXiv:2211.00263) reported a heavy Fermi liquid with a large Fermi surface and gate-tunable Kondo temperature, destroyed by magnetic field. Determine whether reducing the Kondo coupling by displacement field or field produces a Kondo-breakdown transition at which the Fermi-surface volume jumps from $\nu_f + n_c$ to $n_c$ per moire cell, whether it is continuous, and whether it coincides with magnetic order of the moments. An answer is the Hall number and quasiparticle mass across the transition at $T \to 0$ and the magnetic state on each side.
Revision 2: In $\mathrm{MoTe_2}$/$\mathrm{WSe_2}$ heterobilayers with the $\mathrm{MoTe_2}$ moire band at filling $\nu_f = 1$ (local moments) and the $\mathrm{WSe_2}$ band doped to density $n_c$ per moire cell, Zhao et al. (Nature, 2023, arXiv:2211.00263) reported a heavy Fermi liquid with a large Fermi surface and gate-tunable Kondo temperature, destroyed by magnetic field. Determine whether reducing the Kondo coupling by displacement field or field produces a Kondo-breakdown transition at which the Fermi-surface volume jumps from $\nu_f + n_c$ to $n_c$ per moire cell, whether it is continuous, and whether it coincides with magnetic order of the moments. An answer is the Hall number and quasiparticle mass across the transition at $T \to 0$ and the magnetic state on each side.
Settled by
Hall-number and quantum-oscillation measurements across the tuned transition at the lowest temperatures, with magnetic circular dichroism tracking the order of the local moments.
Kind
well-posed
Answer type
classification
References
(empty)
Literature status
open
Status note
Heavy fermions and their field-induced destruction were reported in 2023; the order of the breakdown transition and its relation to moment ordering are not established as of 2026, to this survey's knowledge.
Posed since
2023

Decisions