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Photogalvanic effect in Weyl semimetals from first principles
被引:86
作者:
Zhang, Yang
[1
,2
]
Ishizuka, Hiroaki
[3
,4
]
van den Brink, Jeroen
[2
]
Felser, Claudia
[1
]
Yan, Binghai
[5
]
Nagaosa, Naoto
[3
,4
,6
]
机构:
[1] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany
[2] Leibniz Inst Solid State & Mat Res, D-01069 Dresden, Germany
[3] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan
[4] Univ Tokyo, Quantum Phase Elect Ctr, Tokyo 1138656, Japan
[5] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-7610001 Rehovot, Israel
[6] RIKEN, CEMS, Wako, Saitama 3510198, Japan
基金:
欧洲研究理事会;
关键词:
PHASE;
D O I:
10.1103/PhysRevB.97.241118
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
Using first-principles calculations, we investigate the photogalvanic effect in the Weyl semimetal material TaAs. We find colossal photocurrents caused by the Weyl points in the band structure in a wide range of laser frequency. Our calculations reveal that the photocurrent is predominantly contributed by the three-band transition from the occupied Weyl band to the empty Weyl band via an intermediate band away from the Weyl cone, for excitations both by linearly and circularly polarized light. Therefore, it is essential to sum over all three-band transitions by considering a full set of Bloch bands (both Weyl bands and trivial bands) in the first-principles band structure while it does not suffice to only consider the two-band direct transition within a Weyl cone. The calculated photoconductivities are well consistent with recent experiment measurements. Our work provides a first-principles calculation on nonlinear optical phenomena of Weyl semimetals and provides a deeper understanding of the photogalvanic effects in complexed materials.
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页数:6
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