[ALPS-users] Local measurements in ALPS

[Michele Dolfi]

I don't really get what you are trying to do, could you attach some 
input file?
Are you using the dmrg application or mps_optim?


Best,
Michele


On 2017-02-21 13:21, Axel Gagge wrote:
> I am trying to do local measurements on a DMRG state, and thought of
> using (using Python):
> 
> 
> parms[0]['MEASURE_LOCAL_AT[n_0]'] = "n|(0)"
> 
> 
> In this case the operator "n" should have support only on the sites
> labeled by even integers, but the DMRG run does not return any output.
> Trying 'MEASURE_LOCAL' of course returns something like "operator n
> not recognized" since it does not work for odd sites.  Is the output
> not supposed to be included with
> "pyalps.loadEigenstateMeasurements()"?
> 
> 
> Is there a way to measure local properties (and correlation functions)
> between even sites only?
> 
> Can (and should) operators be defined on the unit cell as well as the 
> sites?
> 
> 
> /Axel Gagge
> 
> 
> 
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--
ETH Zurich
Michele Dolfi
Institute for Theoretical Physics
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dolfim at phys.ethz.ch
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