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Mott variable-range hopping transport in a MoS2 nanoflake

Xue, Jianhong; Huang, Shaoyun; Wang, Ji Yin and Xu, H. Q. LU (2019) In RSC Advances 9(31). p.17885-17890
Abstract

The transport characteristics of a disordered, multilayered MoS2 nanoflake in the insulator regime are studied by electrical and magnetotransport measurements. The MoS2 nanoflake is exfoliated from a bulk MoS2 crystal and the conductance G and magnetoresistance are measured in a four-probe setup over a wide range of temperatures. At high temperatures, we observe that lnG exhibits a -T-1 temperature dependence and the transport in the nanoflake dominantly arises from thermal activation. At low temperatures, where the transport in the nanoflake dominantly takes place via variable-range hopping (VRH) processes, we observe that lnG exhibits a -T-1/3 temperature dependence, an evidence... (More)

The transport characteristics of a disordered, multilayered MoS2 nanoflake in the insulator regime are studied by electrical and magnetotransport measurements. The MoS2 nanoflake is exfoliated from a bulk MoS2 crystal and the conductance G and magnetoresistance are measured in a four-probe setup over a wide range of temperatures. At high temperatures, we observe that lnG exhibits a -T-1 temperature dependence and the transport in the nanoflake dominantly arises from thermal activation. At low temperatures, where the transport in the nanoflake dominantly takes place via variable-range hopping (VRH) processes, we observe that lnG exhibits a -T-1/3 temperature dependence, an evidence for the two-dimensional (2D) Mott VRH transport. Furthermore, we observe that the measured low-field magnetoresistance of the nanoflake in the insulator regime exhibits a quadratic magnetic field dependence ∼ αB2 with α ∼ T-1, fully consistent with the 2D Mott VRH transport in the nanoflake.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
RSC Advances
volume
9
issue
31
pages
6 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85067423157
ISSN
2046-2069
DOI
10.1039/c9ra03150b
language
English
LU publication?
yes
id
80c3e757-1103-4ca1-a7d9-2c52e641290a
date added to LUP
2019-07-08 10:10:59
date last changed
2019-07-30 05:06:18
@article{80c3e757-1103-4ca1-a7d9-2c52e641290a,
  abstract     = {<p>The transport characteristics of a disordered, multilayered MoS<sub>2</sub> nanoflake in the insulator regime are studied by electrical and magnetotransport measurements. The MoS<sub>2</sub> nanoflake is exfoliated from a bulk MoS<sub>2</sub> crystal and the conductance G and magnetoresistance are measured in a four-probe setup over a wide range of temperatures. At high temperatures, we observe that lnG exhibits a -T<sup>-1</sup> temperature dependence and the transport in the nanoflake dominantly arises from thermal activation. At low temperatures, where the transport in the nanoflake dominantly takes place via variable-range hopping (VRH) processes, we observe that lnG exhibits a -T<sup>-1/3</sup> temperature dependence, an evidence for the two-dimensional (2D) Mott VRH transport. Furthermore, we observe that the measured low-field magnetoresistance of the nanoflake in the insulator regime exhibits a quadratic magnetic field dependence ∼ αB<sup>2</sup> with α ∼ T<sup>-1</sup>, fully consistent with the 2D Mott VRH transport in the nanoflake.</p>},
  author       = {Xue, Jianhong and Huang, Shaoyun and Wang, Ji Yin and Xu, H. Q.},
  issn         = {2046-2069},
  language     = {eng},
  number       = {31},
  pages        = {17885--17890},
  publisher    = {Royal Society of Chemistry},
  series       = {RSC Advances},
  title        = {Mott variable-range hopping transport in a MoS<sub>2</sub> nanoflake},
  url          = {http://dx.doi.org/10.1039/c9ra03150b},
  volume       = {9},
  year         = {2019},
}