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fegg7502(½ð±Ò+3,VIP+0):thanks
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they concluded that the NDR behavior
appears because of the bias-driven electronic structure change
from one class of insulating phase to another through an
exceedingly delocalized conducting phase. The quantum transport
properties of a chain molecule were investigated by
Emberly et al.29 In their tight binding formalism, they concluded
that a saturation in net current through a molecular wire creates
a charge density wave and, as a consequence, weakening of
some molecular bonds take place. At a specific level of bond
weakening, the current through the molecular wire decreases
with the increase in bias, which in turn is responsible for the
NDR behavior of the system.
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fan0221

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NDRµÄ³ÉÒò±È½Ï¸´ÔÓ Õë¶Ô²»Í¬µÄÌåϵÓв»Í¬µÄ½âÊÍ
J Chen ,M A Reed ,A M Rawlett ,et al. Science ,1999 ,286 :1550-1552.£©¶ÔÓÚÏõï§»ùÈ¡´úµÄOPE·Ö×Ó¶øÑÔ£¬ÓÉÓÚÏõ°±»ùµÄÈ¡´úLUMO¹ìµÀµÄÀ©Õ¹ÐÔËæÍâÀ´µç×ÓµÄ×¢Èë·¢Éú±ä»¯µ¼Öµç×Ó´«µ¼ÄÜÁ¦µÄ±ä»¯ÐγɸºÎ¢·Öµç×èЧӦ¡£ÕâÀ°±»ùµÄÈ¡´úÊ®·ÖÖØÒªÒòΪûÓÐÈ¡´úµÄÇé¿öÊÇûÓÐNDRµÄ¡£
C G Zeng ,H Q Wang ,B Wang ,et al. Appl. Phys. Lett , 2000 ,77(22) :3595-3597.ËûÃÇÈÏΪ¸ºÎ¢·Öµç×èЧӦÊÇÓÉC60·Ö×ÓFermiÄܼ¶¸½½üÏÁ³¤µÄLDOSÔÚ²»Í¬µÄƫѹ϶ÔÓ¦ÐԱ仯ËùÖ¡£´Ëʱ£¬·Ö×Ó±¾ÉíµÄµç×ӽṹÊÇNDRµÄÖ÷ÒªÔ­Òò£¬²¢²»Òª½èÖúÍâ½çÈ¡´ú»ò²ôÔÓ¡£Ì¼¹ÜµÄNDRÒ²ÊÇÒ»¸öµÀÀí£¬ÒÀ¿¿×ÔÉí¡£[16] A A Farajian ,K Esfarjani and Y Kawazoe. Phys. Rev.Lett. 1999, 82(25) :5084-5087.

¶ÔÓÚ¼òµ¥µÄÔ­×ÓÏßÔ­×ÓÍÅ´ØÀ´Ëµ£¬ÓÉÓÚ×ÔÉí½á¹¹¼òµ¥Ã»ÓÐÌØÊâÐÔÖÊ£¬ËùÒÔÆä¸ºÎ¢·Öµç×èЧӦµÄÐγÉÔ­ÒòÖ÷Òª±íÏÖÔÚÓë×óÓҵ缫µÄñîºÏÆ¥ÅäÉÏ£¬ B Larade ,J Taylor ,H Mehrez ,et al. Phys. Rev.B. 2001 ,64(7) :75420-75429. C Roland ,V Meunier ,B Larade,et al. Phys. Rev.B. 2002 ,66(3) :35332-35338.

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