Evolution of magnetotransport properties of Weyl semiconductor Te crystals with different Fermi energy

作者：Cheng-Hao Yin, Hongwei Fang, Hongtao Jiang, Lin Cao, Shuang Han, Yang‐Yang Lv, Jian Zhou, Shu‐Hua Yao, Zhongkai Liu, Yan‐Feng Chen, Yan‐Feng Chen · 发表于：Physical review. B./Physical review. B · 年份：2023 · DOI：10.1103/physrevb.108.195121 · 被引用次数：7 · 研究领域：Topological Materials and Phenomena、2D Materials and Applications、Quantum and electron transport phenomena

The Weyl semiconductor is a type of semiconductor material that exhibits unique electronic properties. Tellurium (Te) is a recently discovered quantum material that exhibits quasilinear electronic dispersion, as opposed to the linear dispersion commonly observed in conventional Weyl semimetals. Its electrical- and magnetotransport properties, especially in Te crystals with different Fermi energy, have not been thoroughly investigated in prior studies. Here we successfully grew a series of Te crystals with varied Fermi energy through different temperature-cooling rates in the self-flux method, whose hole concentration can be adjusted from ${10}^{15}\phantom{\rule{0.28em}{0ex}}\mathrm{c}{\mathrm{m}}^{\ensuremath{-}3}$ to ${10}^{16}\phantom{\rule{0.28em}{0ex}}\mathrm{c}{\mathrm{m}}^{\ensuremath{-}3}$. In the case of low hole-concentration (${10}^{15} \mathrm{c}{\mathrm{m}}^{\ensuremath{-}3}$) Te crystals, temperature-dependent resistance shows abstract semiconductor-metal-semiconductor transition behavior with temperature varied. However, in the case of high carrier concentration, it demonstrates a transition from a semiconductor to a metallic state at a temperature $T$ ($T\ensuremath{\sim}50\phantom{\rule{0.16em}{0ex}}\mathrm{K}$). Remarkably, the magnetoresistance (MR), under paralleled electric ($E$) and magnetic ($B$) fields ($E\ensuremath{\parallel}B$), evolves from dominant weak-antilocalization behavior in low hole-concentration samples to coexistence of weak-localization...