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Coulomb interactions of massless Dirac fermions in graphene; pair-distribution functions and exchange-driven spin-polarized phases

机译:石墨烯中无质量狄拉克费米子的库仑相互作用;对分布函数和交换驱动的自旋极化相

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摘要

The quasi-2D electrons in graphene behave as massless fermions obeying a Dirac-Weyl equation in the low-energy regime near the two Fermi points. The stability of spin-polarized phases (SPP) in graphene is considered. The exchange energy is evaluated from the analytic pair-distribution functions, and the correlation energies are estimated via a closely similar four-component 2D electron fluid which has been investigated previously. SPPs appear for sufficiently high doping, when the exchange energy alone is considered. However, the inclusion of correlations is found to suppress the spin-phase transition in ideal graphene. Crown Copyright (c) 2006 Published by Elsevier Ltd. All rights reserved.
机译:石墨烯中的准二维电子表现为无质量的费米子,在低能状态下在两个费米点附近遵循狄拉克-魏尔方程。考虑了石墨烯中自旋极化相(SPP)的稳定性。交换能通过解析对分布函数进行评估,相关能通过之前研究过的非常相似的四组分二维电子流体进行估算。当仅考虑交换能量时,SPP似乎具有足够高的掺杂。但是,发现包含相关性可以抑制理想石​​墨烯中的自旋相变。 Crown版权所有(c)2006,由Elsevier Ltd.发行。保留所有权利。

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