Gap states and edge properties of rectangular graphene quantum dot in staggered potential

Y. H. Jeong; S. R. Eric Yang

doi:10.3938/jkps.71.283

Gap states and edge properties of rectangular graphene quantum dot in staggered potential

Y. H. Jeong, S. R. Eric Yang

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We investigate edge properties of a gapful rectangular graphene quantum dot in a staggered potential. In such a system gap states with discrete and closely spaced energy levels exist that are spatially located on the left or right zigzag edge. We find that, although the bulk states outside the energy gap are nearly unaffected, spin degeneracy of each gap state is lifted by the staggered potential. We have computed the occupation numbers of spin-up and -down gap states at various values of the strength of the staggered potential. The electronic and magnetic properties of the zigzag edges depend sensitively on these numbers. We discuss the possibility of applying this system as a single electron spintronic device.

Original language	English
Pages (from-to)	283-288
Number of pages	6
Journal	Journal of the Korean Physical Society
Volume	71
Issue number	5
DOIs	https://doi.org/10.3938/jkps.71.283
Publication status	Published - 2017 Sept 1

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, ICT & Future Planning(MSIP) (NRF-2015R1D1A1A01056809).

Publisher Copyright:
© 2017, The Korean Physical Society.

Keywords

Edge reconstruction
Gap states
Graphene quantum dot
Staggered potential

ASJC Scopus subject areas

General Physics and Astronomy

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10.3938/jkps.71.283

Cite this

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abstract = "We investigate edge properties of a gapful rectangular graphene quantum dot in a staggered potential. In such a system gap states with discrete and closely spaced energy levels exist that are spatially located on the left or right zigzag edge. We find that, although the bulk states outside the energy gap are nearly unaffected, spin degeneracy of each gap state is lifted by the staggered potential. We have computed the occupation numbers of spin-up and -down gap states at various values of the strength of the staggered potential. The electronic and magnetic properties of the zigzag edges depend sensitively on these numbers. We discuss the possibility of applying this system as a single electron spintronic device.",

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AU - Eric Yang, S. R.

N1 - Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, ICT & Future Planning(MSIP) (NRF-2015R1D1A1A01056809). Publisher Copyright: © 2017, The Korean Physical Society.

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N2 - We investigate edge properties of a gapful rectangular graphene quantum dot in a staggered potential. In such a system gap states with discrete and closely spaced energy levels exist that are spatially located on the left or right zigzag edge. We find that, although the bulk states outside the energy gap are nearly unaffected, spin degeneracy of each gap state is lifted by the staggered potential. We have computed the occupation numbers of spin-up and -down gap states at various values of the strength of the staggered potential. The electronic and magnetic properties of the zigzag edges depend sensitively on these numbers. We discuss the possibility of applying this system as a single electron spintronic device.

AB - We investigate edge properties of a gapful rectangular graphene quantum dot in a staggered potential. In such a system gap states with discrete and closely spaced energy levels exist that are spatially located on the left or right zigzag edge. We find that, although the bulk states outside the energy gap are nearly unaffected, spin degeneracy of each gap state is lifted by the staggered potential. We have computed the occupation numbers of spin-up and -down gap states at various values of the strength of the staggered potential. The electronic and magnetic properties of the zigzag edges depend sensitively on these numbers. We discuss the possibility of applying this system as a single electron spintronic device.

KW - Edge reconstruction

KW - Gap states

KW - Graphene quantum dot

KW - Staggered potential

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IS - 5

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Gap states and edge properties of rectangular graphene quantum dot in staggered potential

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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