Fractional quantum anomalous Hall effect in multilayer graphene

Zhengguang Lu, Tonghang Han, Yuxuan Yao, Aidan P. Reddy, Jixiang Yang, Junseok Seo, Kenji Watanabe, Takashi Taniguchi, Liang Fu and Long Ju ()
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Zhengguang Lu: Massachusetts Institute of Technology
Tonghang Han: Massachusetts Institute of Technology
Yuxuan Yao: Massachusetts Institute of Technology
Aidan P. Reddy: Massachusetts Institute of Technology
Jixiang Yang: Massachusetts Institute of Technology
Junseok Seo: Massachusetts Institute of Technology
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Liang Fu: Massachusetts Institute of Technology
Long Ju: Massachusetts Institute of Technology

Nature, 2024, vol. 626, issue 8000, 759-764

Abstract: Abstract The fractional quantum anomalous Hall effect (FQAHE), the analogue of the fractional quantum Hall effect1 at zero magnetic field, is predicted to exist in topological flat bands under spontaneous time-reversal-symmetry breaking2–6. The demonstration of FQAHE could lead to non-Abelian anyons that form the basis of topological quantum computation7–9. So far, FQAHE has been observed only in twisted MoTe2 at a moiré filling factor v > 1/2 (refs. 10–13). Graphene-based moiré superlattices are believed to host FQAHE with the potential advantage of superior material quality and higher electron mobility. Here we report the observation of integer and fractional QAH effects in a rhombohedral pentalayer graphene–hBN moiré superlattice. At zero magnetic field, we observed plateaus of quantized Hall resistance $${R}_{xy}=\frac{h}{v{{\rm{e}}}^{2}}$$ R x y = h v e 2 at v = 1, 2/3, 3/5, 4/7, 4/9, 3/7 and 2/5 of the moiré superlattice, respectively, accompanied by clear dips in the longitudinal resistance Rxx. Rxy equals $$\frac{2h}{{{\rm{e}}}^{2}}$$ 2 h e 2 at v = 1/2 and varies linearly with v, similar to the composite Fermi liquid in the half-filled lowest Landau level at high magnetic fields14–16. By tuning the gate-displacement field D and v, we observed phase transitions from composite Fermi liquid and FQAH states to other correlated electron states. Our system provides an ideal platform for exploring charge fractionalization and (non-Abelian) anyonic braiding at zero magnetic field7–9,17–19, especially considering a lateral junction between FQAHE and superconducting regions in the same device20–22.

Date: 2024
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DOI: 10.1038/s41586-023-07010-7

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