Room-Temperature Quantum Transport Signatures in Graphene/LaAlO₃/SrTiO₃ Heterostructures

Researchers high mobility graphene field-effect devices on a complex-oxide heterostructure, LaAlO₃/SrTiO₃. These devices exhibit quantum transport signatures such as the anomalous quantum Hall effect and WAL behavior over a broad temperature range. The mobility is only weakly dependent on temperature suggesting weak coupling with substrate optical modes and suppressed electron–phonon scattering contributions. The unique interaction with the oxide heterostructure is associated with direct observation of pseudospin chirality via weak antilocalization (WAL) up to room temperature (RT) in chemical vapor deposition (CVD)-grown graphene.