Extended Data Figure 5: Double conductance peaks in seven different devices.
From: Tunable symmetry breaking and helical edge transport in a graphene quantum spin Hall state
A generic feature of the intermediate regime between the insulating and metallic QSH regimes is the appearance of double conductance peaks close to ν = 0. The figure shows two-terminal conductance versus back-gate voltage, VG. Purely perpendicular magnetic field only (BT = B⊥, black lines) results in an insulating state at ν = 0. Increasing the total magnetic field while keeping the perpendicular component constant (BT > B⊥, red lines), induces a transition to the CAF with an associated double conductance peak feature. Devices are ordered from left to right by descending aspect ratio.
