[ALPS-users] Fwd: Re: diagonal correlations

Wed Feb 8 00:56:35 CET 2017

I see, so you defined the operator under the SITEBASIS. I thought it would
work if you define it, as suggested on the earlier replies, as a site
operator. I don't know the difference though, thank you for the help.

On Wed, Feb 8, 2017 at 3:04 AM, julien <julien.despres at institutoptique.fr>
wrote:

> I forgot the corresponding python script ...
>
>
> On 07/02/2017 17:04, Robertson Esperanza wrote:
>
> Yes, it is intended when I attached it, so it can be changed. When i run
> the script, I put the filepath, but I still get the x = [0], y = [0]
> result. Can I see what's the result when you run the script? Thank you for
> the help.
>
> On Tue, Feb 7, 2017 at 6:53 PM, Julien <julien.despres at institutoptique.fr>
> wrote:
>
>> yes, there is no path ...
>>
>> Julien
>>
>> On 07/02/2017 09:53, Robertson Esperanza wrote:
>>
>> the line where I put the file path of the xml file (i.e.
>> 'MODEL_LIBRARY':) ?
>>
>> On Tue, Feb 7, 2017 at 4:04 PM, Julien <julien.despres at institutoptique.fr
>> > wrote:
>>
>>> 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 <+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 <+33%201%2064%2053%2033%2049>
>>> __________________________________
>>>
>>> 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 institutoptiqu
>>> e.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>
>>>>> 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> 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 <+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 <+33%201%2064%2053%2033%2049>
>>>> __________________________________
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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 <+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 <+33%201%2064%2053%2033%2049>
>>> __________________________________
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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 <+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 <+33%201%2064%2053%2033%2049>
>> __________________________________
>>
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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 <+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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