Dual-gated hBN/bilayer-graphene superlattices and the transitions between the insulating phases at the charge neutrality point

TL;DR

This study investigates the transport properties of dual-gated hBN/bilayer-graphene superlattices at the charge neutrality point, revealing phase transitions between insulating states under magnetic fields and displacement tuning.

Contribution

It provides new insights into the phase transitions at the charge neutrality point in plain bilayer graphene superlattices under magnetic and electric fields.

Findings

Detected transitions between insulating phases at the CNP under magnetic field.

Analyzed resistance-temperature and magnetoresistance to characterize phase behavior.

Explored the phase diagram of hBN/BLG superlattices beyond the CNP.

Abstract

We report on transport properties in dual-gated hexagonal boron nitride (hBN)/bilayer-graphene (BLG) superlattices. Here, BLG is nontwisted, i.e., plain. This paper focuses on the charge neutrality point (CNP) for a plain BLG. Under a perpendicular magnetic field, transitions between two insulating phases at the CNP are detected by varying a displacement field with the study on the resistance-temperature characteristics and the magnetoresistance. This work opens avenues for exploring the global phase diagram of the hBN/BLG superlattices beyond the CNP.