Thickness-tuned magnetotransport properties of topological semimetal trigonal PtBi2

被引:4
|
作者
Zhu, Ankang [1 ]
Wang, Huanhuan [1 ]
Chen, Zheng [2 ]
Han, Yuyan [2 ]
Zhu, Mengcheng [1 ]
Han, Minglong [1 ]
Zhu, Xiangde [2 ]
Gao, Wenshuai [1 ]
Tian, Mingliang [2 ,3 ]
机构
[1] Anhui Univ, Inst Phys Sci & Informat Technol, Informat Mat & Intelligent Sensing Lab Anhui Prov, Hefei 230601, Peoples R China
[2] Chinese Acad Sci, Anhui Prov Key Lab Condensed Matter Phys Extreme C, High Magnet Field Lab, Hefei 230031, Peoples R China
[3] Anhui Univ, Sch Phys & Optoelect Engn, Hefei 230601, Peoples R China
基金
中国国家自然科学基金;
关键词
SINGLE DIRAC CONE; QUANTUM TRANSPORT; INSULATOR;
D O I
10.1063/5.0137604
中图分类号
O59 [应用物理学];
学科分类号
摘要
Here, we report systematic studies on thickness-dependent magnetotransport properties of trigonal layered PtBi2. When the thickness decreases, the metallicity is gradually suppressed, and it ultimately displays a semiconductor-like behavior when the thickness is reduced to 22 nm. Interestingly, the magnetoresistance (MR) decreases gradually as well as the thickness decreases, followed by an abrupt increase in the 22 nm nanoflake. The Hall resistance demonstrates the distinct evolution of an electronic state on thickness, revealing that the carrier compensation mechanism may play a role on the large MR in the 22 nm PtBi2 nanoflake. The scanning transmission electron microscopy image clearly uncovers the surface reconstruction of trigonal PtBi2, and qualitative interpretation is proposed for understanding the thickness-dependent transport properties. Our results provide insight into the electronic properties in the low-dimensional limit of topological semimetal trigonal PtBi2.
引用
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页数:6
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