[ALPS-users] diagonal correlations
Julien
julien.despres at institutoptique.fr
Mon Feb 6 09:29:32 CET 2017
Hi,
you can do it in this way but in your parameter file you have to write :
model['MODEL_LIBRARY'] = 'my_own_models.xml'
or you can put it wherever you want but in this case :
model['MODEL_LIBRARY'] = 'path_to_the_xml_file'
Julien
On 06/02/2017 09:21, Robertson Esperanza wrote:
> When creating a new model file, is it necessary that the new model
> file be saved on the same folder of the default models.xml file?
>
> On Mon, Feb 6, 2017 at 3:55 PM, Michele Dolfi <dolfim at phys.ethz.ch
> <mailto:dolfim at phys.ethz.ch>> wrote:
>
> MEASURE_AVERAGE is compute the average among all sites, i.e. a
> scalar value.
> MEASURE_LOCAL returns a list of measurements on all sites.
>
> Best,
> Michele
>
> --
> ETH Zurich
> Dr.Michele Dolfi
> Institute for Theoretical Physics
> HIT G 32.4
> Wolfgang-Pauli-Str. 27
> 8093 Zurich
> Switzerland
>
> dolfim at phys.ethz.ch <mailto:dolfim at phys.ethz.ch>
> www.itp.phys.ethz.ch <http://www.itp.phys.ethz.ch>
>
> +41 44 633 78 56 <tel:+41%2044%20633%2078%2056> phone
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>
>> On 6 Feb 2017, at 08:50, Robertson Esperanza
>> <robbie.esperanza at gmail.com <mailto:robbie.esperanza at gmail.com>>
>> wrote:
>>
>> Oh, I forgot to mention that I'm using mps_optim application. How
>> does the result of MEASURE_AVERAGE differ from MEASURE_LOCAL, if
>> let's say I use "n" for these parameters? Thanks
>>
>> On Mon, Feb 6, 2017 at 3:08 PM, Michele Dolfi
>> <dolfim at phys.ethz.ch <mailto:dolfim at phys.ethz.ch>> wrote:
>>
>> Hello,
>>
>> Could you please be a bit more specific about the application
>> you are running?
>>
>> You are right about the local measurement, but you need
>> MEASURE_LOCAL, since you want to value at each site. Since
>> the n_i^2 operator is not yet defined in the model library,
>> you need to add it yourself. Basically I would do as follow:
>> 1. Copy the file models.xml from
>> ALPS_ROOT/lib/xml/models.xml, where ALPS_ROOT is the root
>> location of your alps installation.
>>
>> 2. Add this definition to your local copy, it defines the n^2
>> operator
>> <SITEOPERATOR name=“n_squared" site="x">
>> n(x)*n(x)
>> </SITEOPERATOR>
>>
>> 3. In your input parameters you have now to link to your new
>> model file.
>> MODEL_LIBRARY=“path/to/models.xml”
>>
>> 4. And add your measurement
>> MEASURE_LOCAL[Density^2] = “ n_squared"
>>
>>
>> Hope this helps.
>>
>> Best,
>> Michele
>>
>> --
>> ETH Zurich
>> Dr.Michele Dolfi
>> Institute for Theoretical Physics
>> HIT G 32.4
>> Wolfgang-Pauli-Str. 27
>> 8093 Zurich
>> Switzerland
>>
>> dolfim at phys.ethz.ch <mailto:dolfim at phys.ethz.ch>
>> www.itp.phys.ethz.ch <http://www.itp.phys.ethz.ch/>
>>
>> +41 44 633 78 56 <tel:+41%2044%20633%2078%2056> phone
>> +41 44 633 11 15 <tel:+41%2044%20633%2011%2015> fax
>>
>>> On 6 Feb 2017, at 07:26, Robertson Esperanza
>>> <robbie.esperanza at gmail.com
>>> <mailto:robbie.esperanza at gmail.com>> wrote:
>>>
>>> Hello,
>>>
>>> I only started studying many-body physics, so there might be
>>> gaps in my knowledge. When using the MEASURE_CORRELATION,
>>> why does the measurement goes for only site i<j, is it
>>> because there will be "blowing up"?
>>>
>>> Alternatively, to measure for i=j, i think I could use
>>> MEASURE_AVERAGE, of let's say (n_i)^2 where n - n_up +
>>> n_down. How could I define such measurement, where you use
>>> an operator successively? Thank you for replying
>>>
>>> Robertson Esperanza
>>>
>>>
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__________________________________
DESPRES Julien
Ph.D. student
Center for Theoretical Physics
Quantum Matter Theory team
Ecole Polytechnique
91128 Palaiseau Cedex
France, EU
Office : 00.10.06 (ground floor)
Phone : +33 1 64 33 42 81
Laboratoire Charles Fabry
Atom Optics group
Institut d'Optique Graduate School
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France, EU
Office : R2.29 (1st floor)
Phone: +33 1 64 53 33 49
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