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Kronig-Penney model U(x) 0 0<x<a U(0), a<x<a+b=1 U(x+nl)=U(x),n=0,1,2… -b0 aa+b 2a+b 2(a+b) E>Uo E<Uo http://lamp.tu-graz.ac.at/~hadley/ss1/KronigPenney/KronigPenney.phpKronig-Penney model a b 0 a b  2a b  x U x( ) 2( ) a b             U a x a b l x a U x ( 0), 0, 0 ( ) 0 http://lamp.tu-graz.ac.at/~hadley/ss1/KronigPenney/KronigPenney.php U x nl U x n ( ) ( ), 0,1,2    E U 0 E U 0
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