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¡ï ¡ï
fegg7502(½ð±Ò+2,VIP+0):¹ÄÀø½»Á÷£¡
fegg7502(½ð±Ò+2,VIP+0):¹ÄÀø½»Á÷£¡
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STMʵÑéÖУ¬NDRÖ÷ÒªÊÇÓÉÓÚSTMÕë¼âÔÚ·ÑÃ×Äܼ¶¸½½üµÄ̬ÃܶȵľÖÓò·åÒýÆðµÄ£¬¶ø·Ö×ÓÆ÷¼þÖУ¬À´Ô´ÓÚÌåϵµÄµç×ӽṹÄËÖÁÔ×ӽṹÔÚÆ«Ñ¹Ïµı仯¡£ ÕâÆª×ÛÊöÓÐÒ»¶Î¹ØÓÚNDRµÄÆðÒòµÄ̽ÌÖ¡£ nature nanotechnology v£±£¬£±£·£³£¨£²£°£°£¶£© |
8Â¥2008-12-23 22:13:59
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fegg7502(½ð±Ò+3,VIP+0):thanks
fegg7502(½ð±Ò+3,VIP+0):thanks
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NDRЧӦ£¨¸ºÎ¢·Öµç×èЧӦ£©ÊÇÖ¸ÔÚһЩµçÑ¹ÇøÓò£¬ÔÚµçѹÓëµçÁ÷¹ØÏµÍ¼ÖУ¬µçÁ÷µÄµ¼ÊýΪ¸º¡£¼´µçѹ¸ßʱµçÁ÷·´¶øÐ¡ÁË¡£ ÔÚһЩÎÄÏ×ÉÏ£¬³£ÓÃTransmissionµÄ·åÀ´½âÊÍÕâЩ¸ºÎ¢·ÖЧӦ£¬µ±È»ÄÇÊÇûÓÐÉæ¼°ÖÁÀïÃæµÄ΢¹Û»úÖÆ¡£ ÏÂÃæÊÇСľ³æÈºÉÏ£¬É³Ä®Ö®Ó¥¿´µ½µÄÒ»¶Î½âÊÍ£º 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. |
2Â¥2008-12-22 14:25:14

3Â¥2008-12-22 16:41:11
¡ï ¡ï
fegg7502(½ð±Ò+2,VIP+0):thanks
fegg7502(½ð±Ò+2,VIP+0):thanks
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4Â¥2008-12-22 17:02:48













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