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Researchers have directly observed "trans-moiré orbitals" in multilayer graphene that enforce periodic structures and vanish beyond a 1° twist angle. This discovery clarifies the microscopic mechanism behind the fractional quantum anomalous Hall effect, revealing how electron arrangements dictate resistance-free flow critical for future computing architectures. The findings significantly revise previous estimates of moiré potential strength by hundreds of times, offering new insights into controlling exotic states of matter in twisted materials.
Researchers Map Trans-Moiré Orbitals Enabling Quantum Hall Effect
Moiré-periodic flat-band renormalization in rhombohedral graphene is now measured to be hundreds of times stronger than previously estimated. Electrons are not merely distant from the twisted interface, but are actively forced into newly observed ‘trans-moiré orbitals’ which appear only under specific conditions. These orbitals vanish beyond a 1° twist, coinciding with the disappearance of the fractional quantum anomalous Hall effect.
Yuqin Wang from Peking University and colleagues from National Institute for Material Sciences have, for the first time, directly observed ‘trans-moiré orbitals’ in rhombohedral hexalayer graphene. These orbitals emerge on the distant side of the moiré interface, unexpectedly enforcing its periodic structure. The team found a moiré-periodic flat-band renormalization of approximately 10 meV, hundreds of times stronger than previously thought. These trans-moiré orbitals vanish at twist angles greater than 1°, coinciding with the disappearance of quantum anomalous Hall plateaus, revealing a key link to this effect. Yuqin Wang and colleagues have directly observed…
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