[ALPS-users] spin-1 with effective magnetic field at edges

Dear all ALPS users

I am going to run a DMRG simulation on the following one dimensional spin-1 Hamiltonian with open boundary conditions, but with effective magnetic field at both edges :

H=-\sum_{j}^{N-1}S^z_{j}S^z_{j}S^z_{j+1} + D\sum_{j}^{N}(S^z_{j})^2 - h\sum_{j}^{N}S^z_{j} -B\sum_{j}^{N}S^x_{j} + h_{eff}(S_1+S_N),

Indeed in the absence of the effective magnetic field the procedure is straightforward, but I don't see how to modified the lattice or any other requirements to go further

Any help would be appreciated. Thanks,

Javad Vahedi,

Dept. of Physics, Sari Branch of Islamic Azad University, P.O.Box 48164-194, Sari, Iran. Tel: (+98) 911 1554504 Fax: (+98)151 2256679 E-mail: javahedi@gmail.com javahedi@iausari.ac.ir