Fig. 1: Transport measurements in tTLG.
a, Top, schematic of the tTLG sample. Top platinum (Pt) gate and bottom graphite (Gr) gate voltages, \({V}_{\rm{tg}}^{\;\rm{dc}}\) and \({V}_{\rm{bg}}^{\;\rm{dc}}+{V}_{\rm{bg}}^{\;\rm{ac}}\), and the corresponding a.c. magnetic field \({B}_{z}^{\rm{ac}}\) imaged by the scanning SOT are indicated. Bottom, schematic of alternating tTLG. b, Optical image of the tTLG sample with indicated contacts where the longitudinal voltage \({V}_{{x}}\) and transverse voltage \({V}_{{y}}\) are measured. The dotted black line marks the line cuts in Figs. 2 and 3, and the red circle marks the point measurements in Fig. 4. c, Longitudinal resistance \({R}_{{xx}}\) versus carrier density \(n\) (top axis) and magnetic field \({B}_\mathrm{a}\) at temperature T = 300 mK shown on a logarithmic scale. Two Landau fans emanate from the CNP: a steep fan originating from the FB LLs and a shallow fan originating from the Dirac LLs (Extended Data Fig. 1a and Supplementary Information Section I). Dashed blue lines follow the \({R}_{{xx}}\) minima labelled by their Chern number C, defined by the slope. The blue circle marks where the first Dirac LL, ND = 1, crosses the top of the FB. d, Transverse resistance \({R}_{{yx}}\) versus filling factor \(\nu\) and \({B}_\mathrm{a}\) in units of \(h/{e}^{2}\).
