Point contacts in encapsulated graphene
Abstract
We present a method to establish inner point contacts with dimensions as small as 100 nm on hexagonal boron nitride (hBN) encapsulated graphene heterostructures by pre-patterning the top-hBN in a separate step prior to dry-stacking. 2- and 4-terminal field effect measurements between different lead combinations are in qualitative agreement with an electrostatic model assuming point-like contacts. The measured contact resistances are 0.5–1.5 kΩ per contact, which is quite low for such small contacts. By applying a perpendicular magnetic field, an insulating behaviour in the quantum Hall regime was observed, as expected for inner contacts. The fabricated contacts are compatible with high mobility graphene structures and open up the field for the realization of several electron optical proposals.
- Authors:
-
- Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel (Switzerland)
- Department of Physics, Budapest University of Technology and Economics and Condensed Matter Research Group of the Hungarian Academy of Sciences, Budafoki ut 8, 1111 Budapest (Hungary)
- National Institute for Material Science, 1-1 Namiki, Tsukuba 305-0044 (Japan)
- Publication Date:
- OSTI Identifier:
- 22486014
- Resource Type:
- Journal Article
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 107; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BORON NITRIDES; ELECTRIC CONTACTS; GRAPHENE; MAGNETIC FIELDS; MOBILITY
Citation Formats
Handschin, Clevin, Swiss Nanoscience Institute, Klingelbergstrasse 82, CH-4056 Basel, Fülöp, Bálint, Csonka, Szabolcs, Makk, Péter, Blanter, Sofya, Weiss, Markus, Schönenberger, Christian, Watanabe, Kenji, and Taniguchi, Takashi. Point contacts in encapsulated graphene. United States: N. p., 2015.
Web. doi:10.1063/1.4935032.
Handschin, Clevin, Swiss Nanoscience Institute, Klingelbergstrasse 82, CH-4056 Basel, Fülöp, Bálint, Csonka, Szabolcs, Makk, Péter, Blanter, Sofya, Weiss, Markus, Schönenberger, Christian, Watanabe, Kenji, & Taniguchi, Takashi. Point contacts in encapsulated graphene. United States. https://doi.org/10.1063/1.4935032
Handschin, Clevin, Swiss Nanoscience Institute, Klingelbergstrasse 82, CH-4056 Basel, Fülöp, Bálint, Csonka, Szabolcs, Makk, Péter, Blanter, Sofya, Weiss, Markus, Schönenberger, Christian, Watanabe, Kenji, and Taniguchi, Takashi. 2015.
"Point contacts in encapsulated graphene". United States. https://doi.org/10.1063/1.4935032.
@article{osti_22486014,
title = {Point contacts in encapsulated graphene},
author = {Handschin, Clevin and Swiss Nanoscience Institute, Klingelbergstrasse 82, CH-4056 Basel and Fülöp, Bálint and Csonka, Szabolcs and Makk, Péter and Blanter, Sofya and Weiss, Markus and Schönenberger, Christian and Watanabe, Kenji and Taniguchi, Takashi},
abstractNote = {We present a method to establish inner point contacts with dimensions as small as 100 nm on hexagonal boron nitride (hBN) encapsulated graphene heterostructures by pre-patterning the top-hBN in a separate step prior to dry-stacking. 2- and 4-terminal field effect measurements between different lead combinations are in qualitative agreement with an electrostatic model assuming point-like contacts. The measured contact resistances are 0.5–1.5 kΩ per contact, which is quite low for such small contacts. By applying a perpendicular magnetic field, an insulating behaviour in the quantum Hall regime was observed, as expected for inner contacts. The fabricated contacts are compatible with high mobility graphene structures and open up the field for the realization of several electron optical proposals.},
doi = {10.1063/1.4935032},
url = {https://www.osti.gov/biblio/22486014},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 18,
volume = 107,
place = {United States},
year = {Mon Nov 02 00:00:00 EST 2015},
month = {Mon Nov 02 00:00:00 EST 2015}
}