аЯрЁБс>ўџ &(ўџџџ%џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџьЅСq` №RП›bjbjqPqP2::›џџџџџџЄюююююююЪЪЪЪо Е 0іііііііі4 6 6 6 6 6 6 $х hMКZ юD ііD D Z ююііo № № № D vюіюі4 № D 4 № № юю№ іъ № ељуХЪК №  $… 0Е № а № ю№ і –r№ \dріііZ Z ц іііЕ D D D D $&Є&ююююююџџџџ Investigation on spin polarized injection into conjugated polymer Shijie Xie, Jianhua Wei, Jiyong Fu, Junfeng Ren and Liangmo Mei School of Physics and Microelectronics, Shandong University, Jinan, 250100, China State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China Abstract Dynamic process of charge injection is investigated for an open conjugated polymer chain contacted with a metal electrode in the frame work of a nonadiabatic approach. It is found that the injected charges can be fractional, which is considered as a quantum probability. The charges will form wave-packets due to the strong electron-lattice interactions in the conjugated polymer. The maximum charge quantity for each wave-packet is two electronic units as the forbiddance of Pauli principle. Discrete energy levels will appear in the gap accompanying the wave-packet, which results in the potential asymmetry of the charge injection and ejection between the metal electrode and the polymer. Under a strong driving electric field, a wave-packet will dissociate into an extended state. From the non-equilibrium Green's function (NEGF) formalism, we theoretically studied the negative differential resistance (NDR) effect and controllable conductance switching in the organic spintronics and interpreted them with the voltage-induced polarons picture. A giant negative magnetoresistance (MR) exceeding 300% much larger than recent experimental result was obtained. The controllable hysteretic (bistable) current characteristic with the linear sweeps of the bias voltage in the solid state condition and of the electrodes potential in the electrochemical condition were investigated. BCDJЯбжз% & + , 5 H N ‡  Ž — Ф в  e f z {  Ž F J O ^ _ o p … › Ї Ј П Р Э є   # ) F q r … † Б В И О П Ф њѓьчучучучулдучучучучуЭчучучучуШФБЁБЁБЁБЁБЁБЁБЁБЁБЁБЁБЁБЁБЁБЁhк`B*CJKHPJaJph%h\hк`B*CJKHPJaJphhк` hк`o( hbrІh dЂ h dЂCJo(hX=h dЂo(h dЂ h dЂo( h4яh dЂ h dЂCJo( h dЂCJ=CD„…з, 5 š›їђъъъпкЮЬ „в1$WDd`„вgdк`gd dЂ $dрa$gd dЂ$a$gd dЂgd dЂ$a$gd dЂ ›ўФ л м ц ч ()EI[\†˜™š›ьмьмьмьмьмьмьиб hк`h dЂh dЂhк`B*CJKHPJaJph%hу'hк`B*CJKHPJaJph0182PА‚. АЦA!А"А# $ %ААSАр Љ†œJ`ёџJ dЂck‡e $1$a$ CJKH_HaJmH nHsH tH4`4 dЂh˜˜ 1$@& 5CJ\@`@ dЂh˜˜ 5$$dр@&a$ 5CJ\$A@ђџЁ$ иžЄ‹Еk=„W[SOFi@ѓџГF nfhˆ