Fig. 3: Existence of an additional conducting channel originates from a pure band effect in β-Ag₂Se.

a The longitudinal conductance G_xx, rescaled versus out-of-plane component of magnetic field. Inset displays the definition of angle θ. b The amplitudes of anomaly B2 are plotted against tilted angle θ, and fitted by cosⁿθ function with index n = 4.6, indicates the fast damping of B2 when the magnetic field is tilted away from a-axis. c The temperature-dependent critical fields of B2 shows linear T behaviors, as indicated by the linearly fitted bold red curve. d The angle-dependent critical magnetic fields of anomalies B1 and B2. e The rescaled angle dependence of B1 and B2, as shown in (d), coincides with the angle-dependent frequency of SdH oscillations, which points to the m^* in cyclotron energy ℏω_c.