[ALPS-users] diagonal correlations
Julien
julien.despres at institutoptique.fr
Tue Feb 7 09:04:27 CET 2017
I tested your file after modifying this line. It works
On 07/02/2017 09:01, Julien wrote:
>
> 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> 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> 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> 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 <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> 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 <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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--
__________________________________
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
__________________________________
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