»ã±¨±êÌâ (Title)£ºFirst-Principles Study of Nanometer Size Effect on Group-IV 2-D Materials£¨IV×å¶þά×ÊÁÏÄÉÃ׳ߴçЧӦµÄµÚÒ»ÐÔµÀÀí×êÑУ©

»ã±¨ÈË (Speaker)£ºÕÔ½¨»ª£¨¼ÃÄþѧԺ£©

»ã±¨¹¦·ò (Time)£º2024Äê8ÔÂ30ÈÕ(ÖÜÎå) 10:30-12:30

»ã±¨µØÖ· (Place)£ºÐ£±¾²¿ E106

Ô¼ÇëÈË (Inviter)£ºÈÎΰ ½ÌÊÚ

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ÌáÒª (Abstract)£º

With continued shrinkage of device size in microchips, lateral in-plane coupling (LIPC) between neighboring materials or devices becomes increasingly important. Properties brought about by lateral in-plane coupling between graphene nanoribbons (GNRs) are investigated using the ?rst-principle calculations. It is found that, when two GNRs approach each other, the lateral coupling between the two brings about edge state splitting. Between zigzag-edged graphene nanoribbons (ZGNRs), the coupling mainly results from Coulomb and spin-spin interaction, while for armchair-edged graphene nanoribbons (AGNRs), it is from Coulomb interaction only. It is further found that the maximum inter-ribbon distance for effective coupling depends on the type of ribbons, which is ~10 ? for ZGNRs, but ~6 ? for AGNRs. In addition, properties brought about by LIPC between two-dimensional zigzag-edged silicon (silicene), germanium (germanene), tin (stannene), and lead (plumbene) nanoribbons (ZXNRs; X=Si, Ge, Sn, and Pb) are also respectively investigated using the similar method. It is further found that the maximum inter-ribbon distance for e?ective coupling is ~ 12 ?, which is not dependent on the element, for zigzag group-IV graphene-like nanoribbons. The results may be important for the microminiaturization of future nanoelectronic and spintronic devices based on group-IV graphene-like materials.