物理学报 Acta Phys.Sin.Vol.67,No.15(2018)157701 9米 一CH2F 一CHO -COOH 图7(a)甲基封端的锗烯/锡烯側视图;(b)Sn(P,As,Sb)CH2OCH侧视图和俯视图,其中蓝色箭头表示极化 翻转;(c)—CH2F,一CHO和—COOH基团修饰的锗烯/锡烯侧视图和俯视图;(d)-COOH和(e)-CONH2 修饰的单层MoS2侧视图阿 ig. 7. Side and top views of(a) methyl-terminated germanene/ stanene and(b)Sn(P, As, Sb)CH2OCH3 where the blue arrow denotes that the polarization is switchable; side and top views of (c) germanene/stanene functionalized by -CH2 F, -CHO, and-CcOOH, respectively; side view of Mos2 monolayer functionalized by(d)-COOH and(e)-CONH2, respectively 55) (a)Top Bottom 产。世 只有下层磷烯接触源极和漏极;红色箭头表示垂直极化方向网年蔽长度的金属;(0)二维多铁场效应晶体管设计, 图8(a)高密度二维多铁隧道结设计,其中上下电极是具有不同 Fig 8.(a) Design of high-density two-dimensional multiferroic tunnel junction array, where top and bottom electrodes are metals with significantly different screening lengths;(b) design of two-dimensional multiferroic field-effect transistor, where only the bottom phosphorene layer is attached to the source and drain electrodes Red arrows denote the direction of vertical polarizations 56 157701-8物 理 学 报 Acta Phys. Sin. Vol. 67, No. 15 (2018) 157701 (a) (b) (c) (d) (e) úCH3 úCH2OCH3 úCH2F úCHO úCOOH úCOOH úCONH2 图 7 (a) 甲基封端的锗烯/锡烯侧视图; (b) Sn(P, As, Sb)—CH2OCH3 侧视图和俯视图, 其中蓝色箭头表示极化 翻转; (c) —CH2F, —CHO 和 —COOH 基团修饰的锗烯/锡烯侧视图和俯视图; (d) —COOH 和 (e) —CONH2 修饰的单层 MoS2 侧视图 [55] Fig. 7. Side and top views of (a) methyl-terminated germanene/stanene and (b) Sn(P, As, Sb)—CH2OCH3, where the blue arrow denotes that the polarization is switchable; side and top views of (c) germanene/stanene functionalized by —CH2F, —CHO, and —COOH, respectively; side view of MoS2 monolayer functionalized by (d) —COOH and (e) —CONH2, respectively [55] . “0” “1” (a) (b) 图 8 (a) 高密度二维多铁隧道结设计, 其中上下电极是具有不同屏蔽长度的金属; (b) 二维多铁场效应晶体管设计, 只有下层磷烯接触源极和漏极; 红色箭头表示垂直极化方向 [56] Fig. 8. (a) Design of high-density two-dimensional multiferroic tunnel junction array, where top and bottom electrodes are metals with significantly different screening lengths; (b) design of two-dimensional multiferroic field-effect transistor, where only the bottom phosphorene layer is attached to the source and drain electrodes. Red arrows denote the direction of vertical polarizations [56] . 157701-8