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 journalArticle

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

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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