Creating a single-carbon vacancy introduces(quasi-)localized states for bothαandπelectrons in graphene.Theoretically,interactions between the localized a electrons and quasilocalizedπelectrons of a single-carbon va...Creating a single-carbon vacancy introduces(quasi-)localized states for bothαandπelectrons in graphene.Theoretically,interactions between the localized a electrons and quasilocalizedπelectrons of a single-carbon vacancy in graphene are predicted to control its magnetism.However,experimentally confirming this prediction through manipulating the interactions remains an outstanding challenge.Here we report the manipulation of magnetism in the vicinity of an individual single-carbon vacancy in graphene by using a scanning tunnelling microscopy(STM)tip.Our spin-polarized STM measurements,complemented by density functional theory calculations,indicate that the interactions between the localizedσand quasilocalizedπelectrons could split theπelectrons into two states with opposite spins even when they are well above the Fermi level.Via the STM tip,we successfully manipulate both the magnitude and direction of magnetic moment of theπelectrons with respect to that of the a electrons.Three different magnetic states of the single-carbon vacancy,exhibiting magnetic moments of about 1.60.5μB,and 0μ_B respectively,are realized in our experiment.展开更多
基金supported by the National Natural Science Foundation of China(11974050,11674029)support from the Fundamental Research Funds for the Central Universities,and Chang Jiang Scholars Program+2 种基金supports from MOST through the National Key R&D Program of China(2017YFA0303404 and 2016YFB0700700)the Science Challenge Project(TZ2018004)the NSFC(U-1530401 and 21403081).
文摘Creating a single-carbon vacancy introduces(quasi-)localized states for bothαandπelectrons in graphene.Theoretically,interactions between the localized a electrons and quasilocalizedπelectrons of a single-carbon vacancy in graphene are predicted to control its magnetism.However,experimentally confirming this prediction through manipulating the interactions remains an outstanding challenge.Here we report the manipulation of magnetism in the vicinity of an individual single-carbon vacancy in graphene by using a scanning tunnelling microscopy(STM)tip.Our spin-polarized STM measurements,complemented by density functional theory calculations,indicate that the interactions between the localizedσand quasilocalizedπelectrons could split theπelectrons into two states with opposite spins even when they are well above the Fermi level.Via the STM tip,we successfully manipulate both the magnitude and direction of magnetic moment of theπelectrons with respect to that of the a electrons.Three different magnetic states of the single-carbon vacancy,exhibiting magnetic moments of about 1.60.5μB,and 0μ_B respectively,are realized in our experiment.
