Extended Data Fig. 10: Measured phonon spectrum and EPC in TBG using tip 2.
From: Quantum twisting microscopy of phonons in twisted bilayer graphene
a, Measured conductance, G, versus bias voltage, Vb, and twist angle, θ, exhibiting steps in G that disperse with θ. b, The second derivative, \(\frac{{{\rm{d}}}^{2}I}{{\rm{d}}{V}^{2}}\),obtained numerically from panel a, overlaid with the theoretically calculated phonon spectrum of graphite. c, The intervalley optical modes (TO and LO) EPC, \({g}_{{\rm{optical}}}=\sqrt{({g}_{{\rm{TO}}}^{2}+{g}_{{\rm{LO}}}^{2})/2}\), determined from this measurement (tip 2, cyan) compared with data in the main text (tip 1, blue). Error bars are obtained from differences between measurements at positive and negative bias and all other experimental uncertainties. d, The electron–phason coupling, gphason, determined from this measurement (tip 2, cyan) compared with data in the main text (tip 1, blue). Error bars are obtained from differences between measurements at positive and negative bias and all other experimental uncertainties.
