Hello everybody,
Let us take such a simple input file with irrelevant name parbh:
LATTICE="open chain lattice"
MODEL="boson Hubbard"
L=8
Nmax=4
N_total=8
NONLOCAL=0
U = 1.0
t = 0.24
CONSERVED_QUANTUMNUMBERS="N_total"
SWEEPS=8
NUMBER_EIGENVALUES=1
{MAXSTATES=100}
I produce parbh.in.xml and then I run sparsediag getting a proper ground state energy
(checked independently outside alps)
-1.457060131536948
I use DMRG on the same input file obtaining LOWER eigenenergy...
the result is little dependent on SWEEPS. MAXSTATES (which are rather large) and
is obviously incorrect.
I must be doing something wrong but what is it? Help welcome
Thanks in advance, kuba
--
Jakub Zakrzewski
Zakład Optyki Atomowej
Instytut Fizyki im. M. Smoluchowskiego
ul. Reymonta 4, 30-059 Kraków, Poland
+48-12-6635555, fax +48126338494
http://chaos.if.uj.edu.pl/~kuba