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fanbao_keke

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Çó¸ßÊÖ°ïÎÒÐÞ¸ÄÒ»¸öÇó±¾Õ÷º¯ÊýµÄ³ÌÐò£º
clear all
m=1
tt=1;
ttt=0.1;
w=10
for F=0:0.02:4
J=100;  T=2*pi/w;
tstep=T/J;  U=eye(4,4);
for t=tstep:tstep:T
H=zeros(4,4);
H_0=zeros(4,4);
H_0(1,2)=tt;
H_0(2,1)=tt;
H_0(2,3)=tt;
H_0(3,2)=tt;
H_0(3,4)=tt;
H_0(4,3)=tt;
H_0(1,3)=ttt;
H_0(3,1)=ttt;
H_0(2,4)=ttt;
H_0(4,2)=ttt;
H(1,1)=F*w*sin(w*t);
U=expm(-1i*(H_0+H)*tstep)*U;
end
[C,Ueig]=eig(U);
QuasiEnergy=((1i*log(diag(Ueig))/T));
ExpectH_0=(C'*(H_0)*C);
[ExpSort,Index]=sort(real(diag(ExpectH_0)));
[CC,Ueig]=(eig(U));
%  yy=CC(:,Index(2))  %Õâ¸öÃüÁîÏÂͼ2Óëͼ3µÄͼ»ì´í
  yy=CC(:,2)  %Õâ¸öÃüÁîÏÂÔÚºá×ø±ê2.4¸½½üÓм¸¸öµã²»Á¬Ðø£¬Óв»¶ÔµÄÖµ¡£
yy1(m)=yy(1)
yy2(m)=yy(2)
yy3(m)=yy(3)
yy4(m)=yy(4)
m=m+1;
end
plot(0:0.02:4,abs(yy1).^2,'k.','MarkerSize',1.5)
hold on
plot(0:0.02:4,abs(yy2).^2,'k.','MarkerSize',1.5)
hold on
plot(0:0.02:4,abs(yy3).^2,'k.','MarkerSize',1.5)
hold on
plot(0:0.02:4,abs(yy4).^2,'k.','MarkerSize',1.5)

ÔÚ¼ÆËã±¾Õ÷º¯ÊýʱÓà yy=CC(:,Index(2))  %Õâ¸öÃüÁîÏÂͼ2Óëͼ3µÄͼ»ì´í
  ÓÃyy=CC(:,2)  %Õâ¸öÃüÁîÏÂÔÚºá×ø±ê2.4¸½½üÓм¸¸öµã²»Á¬Ðø£¬Óв»¶ÔµÄÖµ¡£

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Çó¸ßÊÖ°ïÎÒÐÞ¸ÄÒ»¸öÇó±¾Õ÷º¯ÊýµÄ³ÌÐò
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