Extended quantum anomalous Hall states in graphene/hBN moiré superlattices

Lu, Zhengguang; Han, Tonghang; Yao, Yuxuan; Hadjri, Zach; Yang, Jixiang; Seo, Junseok; Shi, Lihan; Ye, Shenyong; Watanabe, Kenji; Taniguchi, Takashi; Ju, Long

doi:10.1038/s41586-024-08470-1

Extended quantum anomalous Hall states in graphene/hBN moiré superlattices

Journal Article · Wed Jan 22 04:00:00 EST 2025 · Nature (London)

DOI:https://doi.org/10.1038/s41586-024-08470-1· OSTI ID:2569394

^[1]; Han, Tonghang ^[1]; ^[1]; Hadjri, Zach ^[1]; ^[1]; Seo, Junseok ^[1]; Shi, Lihan ^[1]; ^[1]; ^[2]; ^[2]; ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
National Institute for Materials Science, Tsukuba (Japan)

Electrons in topological flat bands can form new topological states driven by correlation effects. The pentalayer rhombohedral graphene/hexagonal boron nitride (hBN) moiré superlattice was shown to host fractional quantum anomalous Hall effect (FQAHE) at approximately 400 mK, triggering discussions around the underlying mechanism and role of moiré effects. In particular, new electron crystal states with non-trivial topology have been proposed. Here, in this paper, we report electrical transport measurements in rhombohedral pentalayer and tetralayer graphene/hBN moiré superlattices at electronic temperatures down to below 40 mK. We observed two more fractional quantum anomalous Hall (FQAH) states and smaller R_xx values in pentalayer devices than those previously reported. In the new tetralayer device, we observed FQAHE at moiré filling factors v = 3/5 and 2/3. With a small current at the base temperature, we observed a new extended quantum anomalous Hall (EQAH) state and magnetic hysteresis, where R_xy = h/e² and vanishing R_xx spans a wide range of v from 0.5 to 1.3. At increased temperature or current, EQAH states disappear and partially transition into the FQAH liquid. Furthermore, we observed displacement field-induced quantum phase transitions from the EQAH states to the Fermi liquid, FQAH liquid and the likely composite Fermi liquid. Our observations established a new topological phase of electrons with quantized Hall resistance at zero magnetic field and enriched the emergent quantum phenomena in materials with topological flat bands.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: SC0025325; SC0025325

OSTI ID:: 2569394

Report Number(s):: DOELongJu25325Extended

Journal Information:: Nature (London), Journal Name: Nature (London) Journal Issue: 8048 Vol. 637; ISSN 1476-4687; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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