[ALPS-users] diagonal correlations
Julien
julien.despres at institutoptique.fr
Tue Feb 7 09:01:44 CET 2017
Hi,
there is a little problem in your python script; have a look to the line
where you include the xml file for the models.
Julien
-
__________________________________
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
2 Avenue Augustin Fresnel
91127 Palaiseau Cedex
France, EU
Office : R2.29 (1st floor)
Phone: +33 1 64 53 33 49
__________________________________
On 07/02/2017 04:24, Robertson Esperanza wrote:
> I tried to print the result of taking the local measurement for n_i^2
> but it only shows
> x = [0], y = [0], instead of x = [0 1 2 3 4 5 6 7 8 9], y = [10 scalar
> values] (since i'm using a 10-site open chain). I attached my python
> script and mymodels.xml. Thank you for the help.
>
> On Mon, Feb 6, 2017 at 4:29 PM, Julien
> <julien.despres at institutoptique.fr
> <mailto:julien.despres at institutoptique.fr>> wrote:
>
> 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
>> +41 44 633 11 15 <tel:+41%2044%20633%2011%2015> fax
>>
>>> 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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>>>
>>>
>>>
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>>
>>
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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 <tel:+33%201%2064%2033%2042%2081>
>
> Laboratoire Charles Fabry
> Atom Optics group
> Institut d'Optique Graduate School
> 2 Avenue Augustin Fresnel
> 91127 Palaiseau Cedex
> France, EU
> Office : R2.29 (1st floor)
> Phone: +33 1 64 53 33 49
> __________________________________
>
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