cdag_up c_up]="cdag_up:c_up"
Best regards,
Michele
--
ETH Zurich
Michele Dolfi
Institute for Theoretical Physics
HIT G 32.4
Wolfgang-Pauli-Str. 27
8093 Zurich
Switzerland
dolfim@phys.ethz.ch
www.itp.phys.ethz.ch
+41 44 633 78 56 phone
+41 44 633 11 15 fax
On Jun 12, 2014, at 2:08 AM, Ryo IGARASHI <
rigarash@issp.u-tokyo.ac.jp> wrote:
> Hi, Fernando,
>
> Assuming that you use DMRG simulation since you specify 'MAXSTATES'.
>
>
> (2014/06/12 0:10), Fernando Iemini wrote:
>> I've using the ''alternative fermion Hubbard'' model, with open boundary
>> conditions, and analyzing its single-particle correlations, <cdag_up:c_up>.
>> I'm not being able however to compute these observables for larger
>> lattices, e.g., L=~160. I'm getting a "segmentation fault" message, does
>> anybody know why is happening this error, maybe due to memory? If so, what
>> would be good parameters in order to avoid it?
>>
>> Here is the script i'm using:
>>
>> LATTICE="open chain lattice"
>> MODEL="alternative fermion Hubbard"
>> CONSERVED_QUANTUMNUMBERS="N,Sz,Nup,Ndown"
>> N_total=160
>> Sz_total=0
>> Nup_total=80
>> Ndown_total=80
>> mu=0
>> t=1
>> NUMBER_EIGENVALUES=1
>> L=160
>> MAXSTATES=100
>> MEASURE_CORRELATIONS[cdag_up c_up]="cdag_up:c_up"
>> {U = 9.000000e-01,V=5.500000e-01,TRUNCATION_ERROR=1e-7}
>
> This is memory issue. The problem is that 'MEASURE_CORRELATIONS'
> collects all pair sites. Observing ~10000 measurements costs too much
> memory.
>
> Not tested, but I believe that you can avoid this issue by tweaking
> models.xml and lattices.xml. Change the name of some specific operator
> and just calculating between them.
>
> --
> Ryo IGARASHI, Ph.D.
>
rigarash@issp.u-tokyo.ac.jp
> tel: 04-7136-5343, fax: 04-7136-3441
> OpenPGP fingerprint: BAD9 71E3 28F3 8952 5640 6A53 EC79 A280 6A19 2319
>