Hamiltonian set to `collinear` does not work

[mec07]

There is a problem when we try to use the collinear Hamiltonian. The error is that it cannot find an appropriate model.

This means that we need to decide on the appropriate model (probably TBexp.py).

I'm also a little confused about why we are adding in noncollinear des terms (what is des?) to the collinear Fock matrix in pylato/hamiltonian.py. I think @mb4512 wrote this originally, do you recall, Max?

[horsfielda]

You should be able to use any model provided it has a value of Stoner I defined. TBexp.json includes this value (5.0).

des is the onsite shift due spin and charge. I agree with you, the way it is added looks wrong: it looks non-collinear.

On Sat, 24 Nov 2018, Marc Coury wrote:

There is a problem when we try to use the collinear Hamiltonian. The error is that it cannot find an appropriate model.

This means that we need to decide on the appropriate model (probably TBexp.py).

I'm also a little confused about why we are adding in noncollinear des terms (what is des?) to the collinear Fock matrix in pylato/hamiltonian.py. I think @mb4512 wrote this originally, do you recall, Max?

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[mec07]

Ahhh it turns out that I was getting this error because I had:

{
  "model": "TBcanonical",
  "Hamiltonian": "collinear",
...
}

in the JobDef.json. That causes the clash. If I instead put:

{
  "model": "TBhydrocarbons",
  "Hamiltonian": "collinear",
...
}

then it works.

This is really confusing behaviour and needs to be sorted out so that either you get a meaningful error message or it's super clear in the example JobDef.json.

OK, thanks for clarifying what des means. Do you know what it actually stands for? I think that we should rename this variable, what would you call it, @horsfielda ?

[horsfielda]

des stands for shift (d as in dy/dx) in onsite energy (e) due to spin (s).

How about onsiteShiftSpin for a new name?

On Sat, 24 Nov 2018, Marc Coury wrote:

Ahhh it turns out that I was getting this error because I had:

{
 "model": "TBcanonical",
 "Hamiltonian": "collinear",
...
}```
in the `JobDef.json`. That causes the clash. If I instead put:

{ "model": "TBhydrocarbons", "Hamiltonian": "collinear", ... }

then it works.

This is really confusing behaviour and needs to be sorted out so that either 
you get a meaningful error message or it's super clear in the example 
`JobDef.json`.

OK, thanks for clarifying what `des` means. Do you know what it actually 
stands for? I think that we should rename this variable, what would you call 
it, @horsfielda ?

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[mec07]

Right, I see.

For python we need to move to snake case for variable names (if we want to be able to take advantage of static analysis tools), so let's call it onsite_shift_spin.

Thanks! :)

[mec07]

hmm... actually how about: spin_onsite_energy_shift? That's slightly clearer

[horsfielda]

Looks good

Sent from my BlackBerry DTEK50 From: notifications@github.com Sent: 24 November 2018 6:24 p.m. To: PyLATO@noreply.github.com Reply to: reply@reply.github.com Cc: a.horsfield@imperial.ac.uk; mention@noreply.github.com Subject: Re: [mec07/PyLATO] Hamiltonian set to collinear does not work (#8)

hmm... actually how about: spin_onsite_energy_shift? That's slightly clearer

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