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

doi:10.3938/jkps.74.154

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 journal › Article › peer-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 language	English
Pages (from-to)	154-158
Number of pages	5
Journal	Journal of the Korean Physical Society
Volume	74
Issue number	2
DOIs	https://doi.org/10.3938/jkps.74.154
Publication status	Published - 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

Access to Document

10.3938/jkps.74.154

Cite this

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title = "Electrical Observation of the Effective Mass in a Single-Crystal WTe2 Layer",

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.",

keywords = "Effective mass, Magnetoresistance, Shubnikov-de Haas oscillation, Transition-metal dichalcogenides, WTe",

author = "Jeehoon Jeon and Park, {Tae Eon} and Chaun Jang and Taeyueb Kim and Jinki Hong and Koo, {Hyun Cheol}",

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: {\textcopyright} 2019, The Korean Physical Society.",

year = "2019",

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doi = "10.3938/jkps.74.154",

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T1 - Electrical Observation of the Effective Mass in a Single-Crystal WTe2 Layer

AU - Jeon, Jeehoon

AU - Park, Tae Eon

AU - Jang, Chaun

AU - Kim, Taeyueb

AU - Hong, Jinki

AU - Koo, Hyun Cheol

N1 - 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.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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.

AB - 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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KW - Shubnikov-de Haas oscillation

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