Figure 2: Negative MR under B//E of a nanowire with diameter ∼200 nm.
From: Giant negative magnetoresistance induced by the chiral anomaly in individual Cd3As2 nanowires
(a) Magnetic field dependence of the resistivity under B<0.5 T for sample 1, showing the weak anti-localization effect at low temperatures. (b,c) MR measured at temperatures from 1.5 to 300 K. The negative MR is observed at all temperatures. The amplitude of the negative MR increases as the temperature increases and reaches a maximum at ∼60 K, then decreases with further increasing temperature. (d) Illustration of split of Dirac points into Weyl nodes under an external magnetic field in the [112] direction. The Dirac points at ±kD in the Brillouin zone of Cd3As2 are marked by red dots. The green (blue) dots correspond to the separated left-handed (right handed) Weyl nodes along the direction of magnetic field. (e) Schematic of the chiral anomaly in Weyl semimetal. L and R represent the left-handed and right-handed chiralities in the lowest Landau levels (N=0), respectively. A magnetic field parallel to the electric field generates an imbalance of chiral charges between the two opposite Weyl nodes. (f) The critical magnetic field BC as a function of temperature. The BC corresponds to the minimum point of each MR curve presented in b,c.
