[ALPS-users] diagonal correlations

[Robertson Esperanza]

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
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>
> 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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