Emergence of Interlayer Coherence in Twist-Controlled Graphene Double Layers

TL;DR

This paper demonstrates that twist-controlled double monolayer graphene exhibits enhanced interlayer tunneling and phase coherence at specific filling factors in the quantum Hall regime, highlighting twist as a crucial control parameter.

Contribution

It reveals the emergence of interlayer phase coherence in twist-controlled graphene heterostructures through tunneling measurements at specific quantum Hall states.

Findings

Enhanced interlayer tunneling at specific filling factors

Zero-bias conductance peaks indicate phase coherence

Twist control is key to revealing interlayer coherence

Abstract

We report enhanced interlayer tunneling with reduced linewidth at zero interlayer bias in a twist-controlled double monolayer graphene heterostructure in the quantum Hall regime, when the top ($\nu_{\mathrm{T}}$) and bottom ($\nu_{\mathrm{B}}$) layer filling factors are near $\nu_{\mathrm{T}}=\pm1/2, \pm3/2$ and $\nu_{\mathrm{B}}=\pm1/2, \pm3/2$, and the total filling factor $\nu = \pm1$ or $\pm3$. The zero-bias interlayer conductance peaks are stable against variations of layer filling factor, and signal the emergence of interlayer phase coherence. Our results highlight twist control as a key attribute in revealing interlayer coherence using tunneling.