Dear alps team
I am using the alps program print_numeric to find the basisvectors and hamiltonian matrix of the system. What I want to know is the energy eigenstate of the corresponding basis vectors.
I use the fulldiag program to find the energyeigenstates. how I know which enegy states corresponds to which basisvector.
As the output in the fulldiag program is divided into Total_Momentum quantum number (0,0) (Pi,0) (0,Pi) (Pi,Pi), I tried to restrict the printnumeric output by fixing the quantum number TOTAL_MOMENTUM="0 0", but it did not work and as got all the basis vectors and basis states.
Since it is very necessary for me to know the lowest energy basis states, please suggest a solution.
my program for print_numeric is as under
LATTICE_LIBRARY = "../../lib/xml/lattices.xml" MODEL_LIBRARY = "../../lib/xml/models.xml" LATTICE = "square lattice" CONSERVED_QUANTUMNUMBER="N" TOTAL_MOMENTUM="0 0" N_total=4 L = 2 U =0 mu = 0 t = 1 t0=0 t1=0 MODEL = "alternative fermion Hubbard"
the outputvectors are like this
[ |0 0 0 0 > |0 0 0 0 > |1 1 2 0 > |1 1 2 0 > ]
which i suppose is spin up, spin down, total particles, total spin
how can we find the total momentum of the above state.
if you say something about total momentum it will be appreciated.
So my problem is to find the basis states of lowest eigenvalues. how can I find them using alps.
Thanks
best regards
khalid loane