Low-field magnetotransport in graphene cavity devices
(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.
(Less)
- author
- Zhang, G. Q. ; Kang, N. ; Li, J. Y. ; Lin, Li ; Peng, Hailin ; Liu, Zhongfan and Xu, H. Q. LU
- organization
- publishing date
- 2018-03-23
- 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
- 2024-06-24 13:05:06
@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}},
keywords = {{grapheme; graphene nanostructures; phase coherent transport; weak localization}},
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}},
}