Fig. 2: Quantum oscillations in the EI phase.
a,b, Rxx (a) and σxy (b) of the W layer (with the Mo layer in the open-circuit configuration) as a function of Vg and Vb at B = 12 T and T = 1.5 K. The black and white dashed lines are the phase boundaries from the data for B = 0 in Fig. 1a. The EI phase is shifted and expanded by the magnetic field. Quantized \({\sigma }_{{xy}}=\frac{{\nu }_{\rm{h}}{e}^{2}}{h}\) for νh = 1–6 is identified in b. In the grey area, Rxx and σxy cannot be reliably measured because of the diverging Rxx. c–e, Rxx (left axis) and σxx and σxy (right axis) along the solid yellow (c), cyan (d) and purple (e) lines in a. The QH states are characterized by Rxx and σxx dips and quantized σxy (horizontal dashed lines). The EI states are characterized by Rxx peaks and suppressed σxx and σxy. Blue arrows identify strong EI states between two integer QH states.
