期刊
NANOTECHNOLOGY
卷 31, 期 14, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab6478
关键词
vanadium diselenide; chemical vapor deposition; charge density wave; magnetoresistance; weak antilocalization
资金
- Hong Kong Polytechnic University [1-ZVGH, G-UAEZ, G-YBFT, G-YBVF]
- Research Grants Council of Hong Kong [PolyU 153271/16P, PolyU 153039/17P]
Two-dimensional (2D) metallic transition metal dichalcogenides (TMDs) exhibit fascinating quantum effects, such as charge-density-wave (CDW) and weak antilocalization (WAL) effect. Herein, low temperature synthesis of 1T phase VSe2 single crystals with thickness ranging from 3 to 41 nm by chemical vapor deposition (CVD) is reported. The VSe2 shows a decreasing phase transition temperature of the CDW when the thickness is decreased. Moreover, low-temperature magnetotransport measurements demonstrate a linear positive and non-saturating magnetoresistance (MR) of 35% from a 35 nm thick VSe2 at 15 T and 2 K due to CDW induce mobility fluctuations. Surprisingly, Kohler's rule analysis of the MR reveals the nonapplicability of Kohler's rule for temperature above 50 K indicating that the MR behavior cannot be described in terms of semiclassical transport on a single Fermi surface with a single scattering time. Furthermore, WAL effect is observed in the 4.2 nm thick VSe2 at low magnetic fields at 2 K, revealing the contribution of the quantum interference effect at the 2D limit. The phase coherence length lAE and spin-orbit scattering length lso were determined to be 73 nm and 18 nm at 2 K, respectively. Our work opens new avenues to study the fundamental quantum phenomena in CVD-deposited TMDs.
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