Imaging the flat bands of magic-angle graphene reshaped by interactions

Cryogenic QTM All measurements in this work were performed in a cryogenic QTM system operating at a temperature of 4 K, as described previously 45 . For conductance measurement, voltage biases are applied using a custom-built digital-to-analogue converter array, capable of supplying both d.c. and a.c. signals with 1 μV resolution. Currents were measured using a FEMTO current amplifier, followed by a National Instruments sampler. …