Abstract
A Weyl semimetal is a novel crystal with low-energy electronic excitations that behave as Weyl fermions. It has received worldwide interest and was believed to have introduced the next era of condensed matter physics after graphene and three-dimensional topological insulators. However, it is not easy to obtain a single large-sized crystal because there are many nucleations in the preparation process. A bottom-seed CVT growth method is proposed in this paper, and we acquired the large-sized, high-quality NbAs single crystals up to 4 × 3 × 3 mm3 finally. X-ray diffraction and STEM confirmed that they are tetragonal NbAs, which the key is to using the seed crystal in a vertical growth furnace. Notably, the photoelectric properties of the crystal are obtained under the existing conditions, which paves the way for follow-up work.
Highlights
Weyl semimetals (WSMs) have obvious chiral fermions and spin structures that can cause a novel carrier response under pulsed laser excitation, leading to new optical phenomena [1,2,3,4,5]
A few noncorresponding crystal planes belonged to polyarsenides, marked with the yellow graphic [20,21,22], and their existence is temporarily unavoidable in the growth of this type of crystal
The quality of the product has been confirmed by powder X-ray diffraction (XRD) and
Summary
Weyl semimetals (WSMs) have obvious chiral fermions and spin structures that can cause a novel carrier response under pulsed laser excitation, leading to new optical phenomena [1,2,3,4,5].
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