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17 April 2024 |
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Article overview
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Helicity protected ultrahigh mobility Weyl fermions in NbP | | Zhen Wang
; Yi Zheng
; Zhixuan Shen
; Yi Zhou
; Xiaojun Yang
; Yupeng Li
; Chunmu Feng
; Zhu-An Xu
; | | Date: |
2 Jun 2015 | | Abstract: | Non-centrosymmetric transition metal monopnictides are promising Weyl
semimetals (WSMs) with exotic physical properties. Although chiral WSM states
have been observed in TaAs and NbAs, there is no conclusive evidence on the
existence of Weyl fermions in NbP. Here, we use angle dependent quantum
oscillations to reveal that NbP has four pairs of usually large Weyl fermion
pockets in the kz=0 plane near the high symmetry points Sigma, dominating over
the coexisting massive hole pockets and the previous reported WSM pockets in
the kz=1.18pi/c plane. Such dominant WSM pockets are highly anisotropic in
k-space and approaching the parabolic band top along the internode direction.
The corresponding Fermi surface is consisting of helical Weyl fermions with
unprecedented mobility of 1*10E7 cm2V-1s-1 at 1.5 K, well protected from defect
backscattering by real spin conservation associated to the chiral Weyl nodes.
Inter-pocket pumping of Weyl fermions with opposite helicity becomes feasible
when the magnetic field and electric field are applied in parallel, manifested
as robust chiral anomaly induced negative MR, another quantum signature of
WSMs. | | Source: | arXiv, 1506.0924 | | Services: | Forum | Review | PDF | Favorites | |
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