Spatially resolved one-dimensional boundary states in graphene-hexagonal boron nitride planar heterostructures

Jewook Park; Jaekwang Lee; Lei Liu; Kendal W. Clark; Corentin Durand; Changwon Park; Bobby G. Sumpter; Arthur P. Baddorf; Ali Mohsin; Mina Yoon; Gong Gu; An Ping Li

doi:10.1038/ncomms6403

Spatially resolved one-dimensional boundary states in graphene-hexagonal boron nitride planar heterostructures

Jewook Park, Jaekwang Lee, Lei Liu, Kendal W. Clark, Corentin Durand, Changwon Park, Bobby G. Sumpter, Arthur P. Baddorf, Ali Mohsin, Mina Yoon, Gong Gu, An Ping Li

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Abstract

Two-dimensional interfaces between crystalline materials have been shown to generate unusual interfacial electronic states in complex oxides. Recently, a one-dimensional interface has been realized in hexagonal boron nitride and graphene planar heterostructures, where a polar-on-nonpolar one-dimensional boundary is expected to possess peculiar electronic states associated with edge states of graphene and the polarity of boron nitride. Here we present a combined scanning tunnelling microscopy and first-principles theory study of the graphene-boron nitride boundary to provide a first glimpse into the spatial and energetic distributions of the one-dimensional boundary states down to atomic resolution. The revealed boundary states are about 0.6 eV below or above the Fermi level depending on the termination of the boron nitride at the boundary, and are extended along but localized at the boundary. These results suggest that unconventional physical effects similar to those observed at two-dimensional interfaces can also exist in lower dimensions.

Original language	English
Article number	5403
Journal	Nature Communications
Volume	5
DOIs	https://doi.org/10.1038/ncomms6403
State	Published - 2014

Funding

This research was conducted at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy (DOE). A portion of theory work (J.L.) is supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US DOE. This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the US DOE under contract no. DE-AC02-05CH11231. The work at UTK was supported by NSF (ECCS-1231808) and DARPA (approved for public release; distribution is unlimited).

Funders	Funder number
DOE Office of Science
Office of Basic Energy Sciences
DOE Office of Science
Scientific User Facilities Division
US Department of Energy
National Science Foundation	ECCS-1231808
U.S. Department of Energy
Directorate for Engineering	1231808
Defense Advanced Research Projects Agency
Oak Ridge National Laboratory

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abstract = "Two-dimensional interfaces between crystalline materials have been shown to generate unusual interfacial electronic states in complex oxides. Recently, a one-dimensional interface has been realized in hexagonal boron nitride and graphene planar heterostructures, where a polar-on-nonpolar one-dimensional boundary is expected to possess peculiar electronic states associated with edge states of graphene and the polarity of boron nitride. Here we present a combined scanning tunnelling microscopy and first-principles theory study of the graphene-boron nitride boundary to provide a first glimpse into the spatial and energetic distributions of the one-dimensional boundary states down to atomic resolution. The revealed boundary states are about 0.6 eV below or above the Fermi level depending on the termination of the boron nitride at the boundary, and are extended along but localized at the boundary. These results suggest that unconventional physical effects similar to those observed at two-dimensional interfaces can also exist in lower dimensions.",

author = "Jewook Park and Jaekwang Lee and Lei Liu and Clark, {Kendal W.} and Corentin Durand and Changwon Park and Sumpter, {Bobby G.} and Baddorf, {Arthur P.} and Ali Mohsin and Mina Yoon and Gong Gu and Li, {An Ping}",

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T1 - Spatially resolved one-dimensional boundary states in graphene-hexagonal boron nitride planar heterostructures

AU - Park, Jewook

AU - Lee, Jaekwang

AU - Liu, Lei

AU - Clark, Kendal W.

AU - Durand, Corentin

AU - Park, Changwon

AU - Sumpter, Bobby G.

AU - Baddorf, Arthur P.

AU - Mohsin, Ali

AU - Yoon, Mina

AU - Gu, Gong

AU - Li, An Ping

PY - 2014

Y1 - 2014

N2 - Two-dimensional interfaces between crystalline materials have been shown to generate unusual interfacial electronic states in complex oxides. Recently, a one-dimensional interface has been realized in hexagonal boron nitride and graphene planar heterostructures, where a polar-on-nonpolar one-dimensional boundary is expected to possess peculiar electronic states associated with edge states of graphene and the polarity of boron nitride. Here we present a combined scanning tunnelling microscopy and first-principles theory study of the graphene-boron nitride boundary to provide a first glimpse into the spatial and energetic distributions of the one-dimensional boundary states down to atomic resolution. The revealed boundary states are about 0.6 eV below or above the Fermi level depending on the termination of the boron nitride at the boundary, and are extended along but localized at the boundary. These results suggest that unconventional physical effects similar to those observed at two-dimensional interfaces can also exist in lower dimensions.

AB - Two-dimensional interfaces between crystalline materials have been shown to generate unusual interfacial electronic states in complex oxides. Recently, a one-dimensional interface has been realized in hexagonal boron nitride and graphene planar heterostructures, where a polar-on-nonpolar one-dimensional boundary is expected to possess peculiar electronic states associated with edge states of graphene and the polarity of boron nitride. Here we present a combined scanning tunnelling microscopy and first-principles theory study of the graphene-boron nitride boundary to provide a first glimpse into the spatial and energetic distributions of the one-dimensional boundary states down to atomic resolution. The revealed boundary states are about 0.6 eV below or above the Fermi level depending on the termination of the boron nitride at the boundary, and are extended along but localized at the boundary. These results suggest that unconventional physical effects similar to those observed at two-dimensional interfaces can also exist in lower dimensions.

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Spatially resolved one-dimensional boundary states in graphene-hexagonal boron nitride planar heterostructures

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