磁性吸附原子在自支撑石墨烯中实现反常多铁性
Realization of anomalous multiferroicity in free-standing graphene with magnetic adatoms
摘要：
通常认为，自支撑石墨烯不表现出任何铁性。在目前的工作中，我们修改了这一说法，并表明，单一的石墨烯片与一对磁性吸附原子可以驱动到铁电（FE）和多铁性（MF）相通过调整狄拉克锥斜率。转变为FE相是逐渐发生的，但通过量子相变，反常MF相突然出现。我们的研究结果表明，这些特征应该存在于最近通过扫描隧道显微镜研究的石墨烯中（Science 352，437（2016））。
英文摘要：
It is generally believed that free-standing graphene does not demonstrate any ferroic properties. In the present work we revise this statement and show that single graphene sheet with a pair of magnetic adatoms can be driven into ferroelectric (FE) and multiferroic (MF) phases by tuning the Dirac cones slope. The transition into the FE phase occurs gradually, but an anomalous MF phase appears abruptly by means of a Quantum Phase Transition. Our findings suggest that such features should exist in graphene recently investigated by Scanning Tunneling Microscopy (Science 352, 437 (2016)).
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