Two dimensional Dirac fermions and quantum magnetoresistance in CaMnBi$_2$

Details Two dimensional Dirac fermions and quantum magnetoresistance in CaMnBi$_2$ Two dimensional Dirac fermions and quantum magnetoresistance in CaMnBi$_2$

2012-04-05

arxiv.org/abs/1204.1333v1

Phys. Rev. B 85, 041101(R) (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

We report two dimensional Dirac fermions and quantum magnetoresistance in single crystals of CaMnBi$_2$. The non-zero Berry's phase, small cyclotron resonant mass and first-principle band structure suggest the existence of the Dirac fermions in the Bi square nets. The in-plane transverse magnetoresistance exhibits a crossover at a critical field $B^*$ from semiclassical weak-field $B^2$ dependence to the high-field unsaturated linear magnetoresistance ($\sim 120%$ in 9 T at 2 K) due to the quantum limit of the Dirac fermions. The temperature dependence of $B^*$ satisfies quadratic behavior, which is attributed to the splitting of linear energy dispersion in high field. Our results demonstrate the existence of two dimensional Dirac fermions in CaMnBi$_2$ with Bi square nets.

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