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fanbao_keke

Ìú³æ (ÕýʽдÊÖ)

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clear all
omega=1;
m=1;
for F=0:0.1:10   
J=40;  T=2*pi/omega;
tstep=T/J;  U=eye(4,4);
for t=tstep:tstep:T      
H_0=zeros(4,4);
H_0(1,2)=0.2;
H_0(2,1)=0.2;
H_0(2,3)=0.2;
H_0(3,2)=0.2;
H_0(3,4)=0.2;
H_0(4,3)=0.2;              
H=zeros(4,4);
for n=1:1:4
H(n,n)=n*F*cos(omega*t);
end
U=expm(-i*(H_0+H)*tstep)*U;
end

[C,Ueig]=eig(U);
QuasiEnergy=i*log(diag(Ueig))/T;
ExpectH_0=C'*H_0*C;
[ExpSort,Index]=sort(diag(ExpectH_0));
E(:,m)=(QuasiEnergy(Index(1:4)));
m=m+1;
end
plot(0:0.1:10,sort(E))


ÒÔÏÂÊÇԭͼÐΣº


[ Last edited by fanbao_keke on 2010-6-11 at 23:50 ]
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fanbao_keke

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[ Last edited by fanbao_keke on 2010-6-11 at 23:48 ]
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fanbao_keke(½ð±Ò+10):лл£¡Ö»ÊÇÏÖÔÚ³ÌÐòÖб¾Õ÷ÖµÔÚÅÅÐòÉÏ»¹ÊÇÓеãÎÊÌ⣬û·¨ÓëԭͼһÖ£¬ÄÜ·ñ°ïÎÒһϡ£ 2010-06-12 21:57:26
fanbao_keke(½ð±Ò+20): 2010-07-22 07:44:02
QuasiEnergy=real(i*log(diag(Ueig))/T);
    ExpectH_0=real(C'*H_0*C);

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[ Last edited by fanbao_keke on 2010-6-13 at 10:21 ]
5Â¥2010-06-12 08:53:38
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