Electrical Observation of the Effective Mass in a Single-Crystal WTe2 Layer

Title
Electrical Observation of the Effective Mass in a Single-Crystal WTe2 Layer
Authors
구현철장차운박태언전지훈Taeyueb KimJinki Hong
Keywords
Effective mass; WTe2; Shubnikov-de Haas oscillation; Magnetoresistance; Transition-metal dichalcogenides
Issue Date
2019-01
Publisher
Journal of the Korean Physical Society
Citation
VOL 74, NO 2-158
Abstract
In order to investigate the effective mass of a single-crystalline WTe2 layer, we measured the temperature dependence of the Shubnikov-de Haas oscillation. In this method, the magnetoresistance with a perpendicular magnetic field is monitored by changing the temperature from 1.9 K to 6 K. The extracted effective mass of WTe2 for magnetic fields ranging from 6.8 T to 8.7 T is m ∗ = 0.327m0 which is almost constant in this range. The theoretical expectation values of m ∗ /m0 for the valence and the conduction bands are 0.58 and 0.26, respectively; the experimental value of the effective mass is between these two values. Thus, our results clearly show that single-crystalline WTe2 has both electron- and hole-like pockets that simultaneously contribute to electrical transport in the channel.
URI
http://pubs.kist.re.kr/handle/201004/68996
ISSN
0374-4884
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