Figure 7: Landau levels for a Dirac semimetal.
From: Magnetic torque anomaly in the quantum limit of Weyl semimetals
Schematic depiction of Landau level structure for a Dirac semimetal neglecting the Zeeman coupling (a) and including Zeeman coupling (b,c). For field along the high-symmetry (001) axis (b) the Dirac node splits into two opposite chirality Weyl nodes, each with a chiral n=0 Landau level whose energy is independent of field and gives paramagnetic response near the quantum limit. For field perpendicular to the high-symmetry axis (c) the field induces a gap in the n=0 Landau levels, giving rise to an ordinary diamagnetic response.
