Spintronic properties of one-dimensional electron gas in graphene armchair ribbons
- Authors
- Lee, J. W.; Kim, S. C.; Yang, S. -R. Eric
- Issue Date
- 11월-2012
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Armchair ribbon; One-dimensional electron gas; Ferromagnetism
- Citation
- SOLID STATE COMMUNICATIONS, v.152, no.21, pp.1929 - 1932
- Indexed
- SCIE
SCOPUS
- Journal Title
- SOLID STATE COMMUNICATIONS
- Volume
- 152
- Number
- 21
- Start Page
- 1929
- End Page
- 1932
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/107008
- DOI
- 10.1016/j.ssc.2012.07.026
- ISSN
- 0038-1098
- Abstract
- We have investigated, using effective mass approach (EMA), magnetic properties of a one-dimensional electron gas in graphene armchair ribbons when the electrons occupy only the lowest conduction subband. We find that magnetic properties of the one-dimensional electron gas may depend sensitively on the width of the ribbon. For ribbon widths L-x = 3Ma(0), a critical point separates ferromagnetic and paramagnetic states while for L-x = (3M + 1)a(0) paramagnetic state is stable (M is an integer and a(0) is the length of the unit cell). These width-dependent properties are a consequence of eigenstates that have a subtle width-dependent mixture of K and K' states, and can be understood by examining the wavefunction overlap that appears in the expression for the many-body exchange self-energy. Ferromagnetic and paramagnetic states may be used for spintronic purposes. (C) 2012 Elsevier Ltd. All rights reserved.
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