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

Jeehoon Jeon, Tae Eon Park, Chaun Jang, Taeyueb Kim, Jinki Hong, Hyun Cheol Koo

    Research output: Contribution to journalArticlepeer-review

    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.

    Original languageEnglish
    Pages (from-to)154-158
    Number of pages5
    JournalJournal of the Korean Physical Society
    Volume74
    Issue number2
    DOIs
    Publication statusPublished - 2019 Jan 1

    Bibliographical note

    Funding Information:
    This work was supported by Korea Institute of Science and Technology (KIST) and Korea University-Korea Institute of Science and Technology (KU-KIST) Institutional Programs and by a National Research Council

    Funding Information:
    of Science & Technology (NST) grant (No. KIST).

    Publisher Copyright:
    © 2019, The Korean Physical Society.

    Keywords

    • Effective mass
    • Magnetoresistance
    • Shubnikov-de Haas oscillation
    • Transition-metal dichalcogenides
    • WTe

    ASJC Scopus subject areas

    • General Physics and Astronomy

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