[ALPS-users] Fwd: Re: diagonal correlations

[Robertson Esperanza]

Just a quick question, using MEASURE_HALF_CORRELATIONS returns real values,
is it the real part, the imaginary part, or the complex amplitude of the
correlation function? Thank you for the help.

On Wed, Feb 8, 2017 at 4:50 PM, Julien <julien.despres at institutoptique.fr>
wrote:

> The operator defined in the 'sitebasis' of a Hamiltonian is only valid for
> this Hamiltonian which is not the case when you define it as a
> 'siteoperator'. You can use it for different models at the condition that
> the operators that you use inside this function are defined in the
> corresponding 'sitebasis'. And one more thing, your function for the
> magnetization 'diag_mag_correct' is not correct from what has been said
> previously.
> Julien
>
>
> On 08/02/2017 00:56, Robertson Esperanza wrote:
>
> 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 institutoptiqu
>>> e.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>
>>>>> __________________________________
>>>>>
>>>>> ---- Comp-phys-alps-users Mailing List for the ALPS Project
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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 <+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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>>
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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>
>> __________________________________
>>
>> ---- Comp-phys-alps-users Mailing List for the ALPS Project
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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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