Extended Data Fig. 5: Phase coherence length Lϕ.
From: A tunable Fabry–Pérot quantum Hall interferometer in graphene
Evolution of the best visibilities \({\mathcal{V}}\) with the perimeter 2L of the interferometers obtained in experiments at base temperature with the outer (blue dots) and the inner (red dots) edge channel. The red solid line shows the thermal broadening contribution. The fit of the data (black dashed line) with Suppl. Eq. (S30) and discarding the inner edge channel experiment for the large interferometer, provides a coherence length of 10 μm at 0.02 K.
