Magnetic Bloch states at integer flux quanta induced by super-moire potential in graphene aligned with twisted boron nitride.

ABSTRACT: Two-dimensional electron systems in both magnetic fields and periodic potentials are described by the Hofstadter butterfly, a fundamental problem of solid-state physics. While moiré systems provide a powerful method to realize this type of spectrum, previous experiments have been limited to fractional flux quanta regime, due to the difficulty of building ~ 50 nm periodic modulations. Here, we demonstrate a super-moiré strategy to overcome this challenge. By aligning monolayer graphene (G) with 1.0° twisted hexagonal boron nitride (t-hBN), a 63.2 nm bichromatic G/t-hBN super-moiré is constructed, made possible by exploiting the electrostatic nature of t-hBN potential. Under magnetic field B , magnetic Bloch states at ϕ / ϕ 0 = 1 - 9 are achieved and observed as integer Brown-Zak oscillatio

SUBMITTER: Ma Y 

PROVIDER: S-EPMC11845499 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature