Fig. 2: Three-dimensional integer quantum Hall effect in HfTe5.
From: Unconventional Hall response in the quantum limit of HfTe5
a Longitudinal electrical resistivity ρxx (blue, left axis) and Hall resistivity ρxy (red, right axis) and as a function of B at T = 3 K with B applied in z. The blue arrows mark the onset of a Landau level (LL). The blue numbers denote the index N of the corresponding LL. The plateau in ρxy scales with (h/e2) π/kF,z, with the Planck constant h, the electron charge e, and the Fermi wavevector in z direction kF,z. b ρxx and c ρxy as a function of B for various temperatures T ≥ 3 K with B applied in z. d ρxy as a function of |B|cos(β) for magnetic fields along the direction with angles β at 3 K.
