Figure 4: Analysis of the quantum oscillations.
From: Evidence for massive bulk Dirac fermions in Pb1−xSnxSe from Nernst and thermopower experiments
(a) Comparison of curves of Sxx and Sxy versus 1/B at 4.71 K in Pb1−xSnxSe (x=0.23). The maxima in Sxy are shifted by a 
period relative to the maxima in Sxx. The N=1 LL shows a weak spin splitting. The sketch (inset) shows the peaks in the DOS of each LL for 3D massive Dirac fermions. (b) Index plot of Bn corresponding to the maxima in |Sxx| (solid circles) and Sxy (triangles) versus the integers n. The straight line is the relation F=2π (n+γ)/
where F is the FS section and γ the Onsager phase. The maxima in Sxy are shifted by 
in n. From the slope, we infer the Fermi wavevector kF=0.0134 Å−1 and ne=8.20 × 1016 cm−3 (per valley). The inset shows the LL energy E versus B in the massive Dirac spectrum for kz=0 (ref. 22).
