期刊
SOLID STATE COMMUNICATIONS
卷 152, 期 21, 页码 1929-1932出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2012.07.026
关键词
Armchair ribbon; One-dimensional electron gas; Ferromagnetism
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2012R1A1A2001554]
- National Research Foundation of Korea [2012R1A1A2001554] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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