Fig. 4: Quantum oscillations and Fermi surface of SrAgBi.
From: Robust three-dimensional type-II Dirac semimetal state in SrAgBi
a Angle-dependent dHvA oscillations; angles between the external magnetic field and crystalline c-axis are indicated. b Fourier transform amplitude spectrum of ΔM, where ΔM = M − 〈M〉, 〈M〉 is the smoothed background; offsets are added for clarity. c Angular dependence of frequencies α and β. Ellipsoidal (spherical) model is applied to smaller (larger) frequency α (β). The good fit demonstrates 3D dimensional character. Temperature dependent dHvA oscillations ΔM versus 1/H. d External magnetic field is fixed along the crystalline c-axis. FFT amplitude e of ΔM, two frequencies α, β are identified with decreasing amplitudes as temperature is increased. Effective mass on each cyclotron orbit is estimated by temperature factor in Lifshitz-Kosevich (LK) formula. f First harmonic-indexed LK formula fit to quantum oscillations. g First-principle calculated Fermi surface h is contributed by four bands, two Kramers degenerated band pairs, near the Fermi energy EF.
