[ALPS-users] diagonal correlations

[Robertson Esperanza]

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>
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> 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
>> www.itp.phys.ethz.ch
>>
>> +41 44 633 78 56 <+41%2044%20633%2078%2056> phone
>> +41 44 633 11 15 <+41%2044%20633%2011%2015> fax
>>
>> On 6 Feb 2017, at 08:50, Robertson Esperanza <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>
>> 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
>>> www.itp.phys.ethz.ch
>>>
>>> +41 44 633 78 56 <+41%2044%20633%2078%2056> phone
>>> +41 44 633 11 15 <+41%2044%20633%2011%2015> fax
>>>
>>> On 6 Feb 2017, at 07:26, Robertson Esperanza <
>>> <robbie.esperanza at gmail.com>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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> __________________________________
>
> DESPRES Julien
> Ph.D. student
>
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