Pressure-driven Lifshitz transition in type-II Dirac semimetal NiTe 2

作者：Mengyao Qi, Chao An, Yonghui Zhou, Hao Wu, Bowen Zhang, Chunhua Chen, Yifang Yuan, Shuyang Wang, Ying Zhou, Xuliang Chen, Ranran Zhang, Zhaorong Yang · 发表于：Physical review. B./Physical review. B · 年份：2020 · DOI：10.1103/physrevb.101.115124 · 被引用次数：44 · 研究领域：2D Materials and Applications、Topological Materials and Phenomena、MXene and MAX Phase Materials

Band engineering in layered transition metal dichalcogenides (TMDs) leads to a variety of emergent phenomena and has obtained considerable attention recently. Transition metal ditelluride ${\mathrm{NiTe}}_{2}$ has been discovered experimentally to be a type-II Dirac semimetal at ambient pressure, and was predicted to display superconductivity in the monolayer limit. Here we systematically investigate the structural and electronic properties of type-II Dirac semimetal ${\mathrm{NiTe}}_{2}$ under high pressure. Room-temperature synchrotron x-ray diffraction and Raman scattering measurements reveal the stability of the pristine hexagonal phase up to 52.2 GPa, whereas both the pressure coefficient and linewidth of Raman mode ${E}_{g}$ exhibit anomalies at a critical pressure ${P}_{\mathrm{c}}\ensuremath{\sim}16\phantom{\rule{0.28em}{0ex}}\mathrm{GPa}$. Meantime, Hall resistivity measurement indicates that the hole-dominated behavior maintains up to 15.6 GPa and transforms into electron-dominated behavior at higher pressures. Our findings consistently demonstrate a pressure-induced Lifshitz transition in type-II Dirac semimetal ${\mathrm{NiTe}}_{2}$.