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Low-field magnetotransport in graphene cavity devices

Zhang, G. Q. ; Kang, N. ; Li, J. Y. ; Lin, Li ; Peng, Hailin ; Liu, Zhongfan and Xu, H. Q. LU (2018) In Nanotechnology 29(20).
Abstract

Confinement and edge structures are known to play significant roles in the electronic and transport properties of two-dimensional materials. Here, we report on low-temperature magnetotransport measurements of lithographically patterned graphene cavity nanodevices. It is found that the evolution of the low-field magnetoconductance characteristics with varying carrier density exhibits different behaviors in graphene cavity and bulk graphene devices. In the graphene cavity devices, we observed that intravalley scattering becomes dominant as the Fermi level gets close to the Dirac point. We associate this enhanced intravalley scattering to the effect of charge inhomogeneities and edge disorder in the confined graphene nanostructures. We... (More)

Confinement and edge structures are known to play significant roles in the electronic and transport properties of two-dimensional materials. Here, we report on low-temperature magnetotransport measurements of lithographically patterned graphene cavity nanodevices. It is found that the evolution of the low-field magnetoconductance characteristics with varying carrier density exhibits different behaviors in graphene cavity and bulk graphene devices. In the graphene cavity devices, we observed that intravalley scattering becomes dominant as the Fermi level gets close to the Dirac point. We associate this enhanced intravalley scattering to the effect of charge inhomogeneities and edge disorder in the confined graphene nanostructures. We also observed that the dephasing rate of carriers in the cavity devices follows a parabolic temperature dependence, indicating that the direct Coulomb interaction scattering mechanism governs the dephasing at low temperatures. Our results demonstrate the importance of confinement in carrier transport in graphene nanostructure devices.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
grapheme, graphene nanostructures, phase coherent transport, weak localization
in
Nanotechnology
volume
29
issue
20
article number
205707
publisher
IOP Publishing
external identifiers
  • scopus:85044819502
  • pmid:29509145
ISSN
0957-4484
DOI
10.1088/1361-6528/aab478
language
English
LU publication?
yes
id
d6165a04-4f69-444e-8247-fb5fc7572c80
date added to LUP
2018-04-13 14:51:36
date last changed
2021-09-22 03:47:47
@article{d6165a04-4f69-444e-8247-fb5fc7572c80,
  abstract     = {<p>Confinement and edge structures are known to play significant roles in the electronic and transport properties of two-dimensional materials. Here, we report on low-temperature magnetotransport measurements of lithographically patterned graphene cavity nanodevices. It is found that the evolution of the low-field magnetoconductance characteristics with varying carrier density exhibits different behaviors in graphene cavity and bulk graphene devices. In the graphene cavity devices, we observed that intravalley scattering becomes dominant as the Fermi level gets close to the Dirac point. We associate this enhanced intravalley scattering to the effect of charge inhomogeneities and edge disorder in the confined graphene nanostructures. We also observed that the dephasing rate of carriers in the cavity devices follows a parabolic temperature dependence, indicating that the direct Coulomb interaction scattering mechanism governs the dephasing at low temperatures. Our results demonstrate the importance of confinement in carrier transport in graphene nanostructure devices.</p>},
  author       = {Zhang, G. Q. and Kang, N. and Li, J. Y. and Lin, Li and Peng, Hailin and Liu, Zhongfan and Xu, H. Q.},
  issn         = {0957-4484},
  language     = {eng},
  month        = {03},
  number       = {20},
  publisher    = {IOP Publishing},
  series       = {Nanotechnology},
  title        = {Low-field magnetotransport in graphene cavity devices},
  url          = {http://dx.doi.org/10.1088/1361-6528/aab478},
  doi          = {10.1088/1361-6528/aab478},
  volume       = {29},
  year         = {2018},
}