Nonlinear Hall quantum oscillations in graphene moiré systems detect the topological nature of Brown-Zak fermions via quantum geometric contributions when commensurability conditions are met.
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BaMnBi2 hosts a spin-valley locked electronic state with fourfold degeneracy, evidenced by stacked QHE and NLHE showing valley-contrasted Berry curvature, distinct from the twofold degeneracy in BaMnSb2.
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Nonlinear Hall quantum oscillations to probe topological Brown-Zak fermions in graphene moir\'e systems
Nonlinear Hall quantum oscillations in graphene moiré systems detect the topological nature of Brown-Zak fermions via quantum geometric contributions when commensurability conditions are met.
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Evidence of Spin-Valley Coupling in Dirac Material BaMnBi2 Probed by Quantum Hall Effect and Nonlinear Hall Effect
BaMnBi2 hosts a spin-valley locked electronic state with fourfold degeneracy, evidenced by stacked QHE and NLHE showing valley-contrasted Berry curvature, distinct from the twofold degeneracy in BaMnSb2.