Electrical Observation of the Effective Mass in a Single-Crystal WTe2 Layer
- Electrical Observation of the Effective Mass in a Single-Crystal WTe2 Layer
- 구현철; 장차운; 박태언; 전지훈; Taeyueb Kim; Jinki Hong
- Effective mass; WTe2; Shubnikov-de Haas oscillation; Magnetoresistance; Transition-metal dichalcogenides
- Issue Date
- Journal of the Korean Physical Society
- VOL 74, NO 2-158
- 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.
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