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zzy870720z(½ð±Ò+2): ллָ½Ì 2011-04-14 20:24:01
zzy870720z(½ð±Ò+2): ллָ½Ì 2011-04-14 20:24:01
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¸ù¾ÝÎÒ¿´µÄÎÄÏ×£¬¼¤×Ó´óÔ¼·ÖΪÁ½ÖÖ£º 1£©Wannier ¨C Matt excitons (free exciton): mainly exist in semiconductors, have a large radius, are delocalized states that can move freely throughout the crystal, the binding energy ~ 0.01 eV; 2£©Frenkel excitons (tight bound excitons): found in insulator and molecular crystals, bound to specific atoms or molecules and have to move by hopping from one atom to another, the binding energywith typical values ranging from about 0.1 eV to several eV. °ëµ¼ÌåµÄ¼¤×Ó½áºÏÄܺÜС£¬¼ÆËãµÄ»°¸ù±¾¿´²»µ½¼¤×Ó·å´æÔÚ£¬ËùÒÔÄã˵µÄ¡°¼¤×ӷ塱¹À¼Æ»¹²»ÊÇʵ¼ÊµÄ¼¤×Ó·åÖµ¡£ Ö»ÓоøÔµÌåÖ®ÀàµÄ²ÅÄÜ¿´µ½±È½û´ø¿í¶ÈСµÄÇ¿¼¤×ÓÎüÊÕ·å¡£ ¸öÈËÀí½â |

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