Wednesday, December 13, 2017

quantum mechanics - Time evolution (spin-1 particle)



The state ket of a spin-1 particle with orbital angular momentum is given by |α,0=f(r)42[2|11L|11S+2(|10L|10S+6|00L|10S)2|11L|11S].

The Hamiltonian is H=1(βL2+2γJS).




Using CGCs, I wrote the state in the |J2,Jz basis as |α,0=f(r)22[23|20+(61)|1013|00].

Since H is diagonal, because H=1(βL2+γ(J2L2+S2))=1(γJ2+(βγ)L2+γS2),
I wrote the energies as Ejls=[γj(j+1)+(βγ)l(l+1)+γs(s+1)].
Is it correct the following? {|20E211=(6γ+2β)|10E111=(2γ+2β),E101=(4γ)|00E011=(2β)
So, the time-evoluted state must be |α,t=f(r)22[23|20ei(6γ+2β)t+6|10ei4γt|10ei(2γ+2β)t13|00ei2βt]?




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