首页|Intrinsic spin Hall conductivity plateau in topological semimetals with triply degenerate points
Intrinsic spin Hall conductivity plateau in topological semimetals with triply degenerate points
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NSTL
Elsevier
It is generally believed that conductivity plateaus can only exist in the insulators with topological nontrivial bulk occupied states. Such rule exhibits in two-dimensional quantum (anomalous) Hall effect, quantum spin Hall effect, and three-dimensional topological insulators. In this work, we propose spin Hall conductivity (SHC) plateau can be formed in three-dimensional metallic materials with triply degenerate points around the Fermi level. With the help of a four-band k.p model, we prove that SHC plateaus can be formed between vertical bar 3/2, +/- 3/2 and vertical bar 1 2, +/- 1 2 states of a metallic systems. Our further ab initio calculations reveal that a nearly ideal SHC plateau exhibits in an experimentally synthesized TaN. The plateau width reaches up to 0.55 eV, hoping to work at high temperatures. The electrical conductivity tensors of TaN indicates that its spin Hall angle reaches -0.57, which is larger than many previous reported materials and makes it an excellent candidate to produce stable spin current.
Spin Hall effectSpin Hall conductivitySpin Berry curvatureSpin Hall conductivity plateauTriply degenerate pointsTANTALUM
NSTL
Elsevier
