Kavli Affiliate: Jie Shan
| First 5 Authors: Wenjin Zhao, Zui Tao, Yichi Zhang, Bowen Shen, Zhongdong Han
| Summary:
A Chern metal is a two-dimensional metallic state of matter carrying chiral
edge states. It can emerge as a doped Chern insulator, but theoretical studies
have also predicted its emergence near a Kondo breakdown separating a metallic
chiral spin liquid and a heavy Fermi liquid in a frustrated lattice. To date,
the latter exotic scenario has not been realized. Here, we report the
observation of a Chern metal at the onset of the magnetic Kondo breakdown in a
frustrated moir’e Kondo lattice–angle-aligned MoTe2/WSe2 bilayers. The state
is compressible and is manifested by a nearly quantized Hall resistance but a
finite longitudinal resistance that arises from a bad metallic bulk. The state
also separates an itinerant and a heavy Fermi liquid and appears far away from
the band inversion critical point of the material, thus ruling out its origin
from simply doping a Chern insulator. We demonstrate the presence of a chiral
edge state by nonlocal transport measurements and current-induced quantum
anomalous Hall breakdown. Magnetic circular dichroism measurements further
reveal a magnetization plateau for the Chern metal before a metamagnetic
transition at the Kondo breakdown. Our results open an opportunity for moir’e
engineering of exotic quantum phases of matter through the close interplay
between band topology and Kondo interactions.
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