Dear ALPS users,
I have two questions related with the DMRG method: (i) Does anybody know whether three and four body interactions terms can be readily implemented in the DMRG code ? If so, (ii) is that algorithm suitable for such type of couplings ?
To be more specific, we would like to apply the algorithm to terms of the form
\sigma_{i}^{+} \sigma_{i+1}^{-} [ \sigma_{i-1}^z + \sigma_{i+2}^z ]
as well as to others of the form
\sigma_{i}^{+} \sigma_{i+1}^{+} [ \sigma_{i-1}^z ( \sigma_{i}^{z} + \sigma_{i+1}^{z}) \sigma_{i+2}^{z} ]
As you can see, these type of terms are rather unusual (but quasi one-dimensional).
Thanks in advance