Meaning of input tag generated in real time simulation

You can post here problems arising when using the latest 5.0 reslease of Yambo. Issues as parallelization strategy, performance issues and other technical aspects realted to the new release.

Moderators: Davide Sangalli, andrea marini, Daniele Varsano, andrea.ferretti, myrta gruning, Conor Hogan

Post Reply
Bramhachari Khamari
Posts: 89
Joined: Wed Oct 23, 2019 5:52 am

Meaning of input tag generated in real time simulation

Post by Bramhachari Khamari » Thu Oct 14, 2021 11:07 am

Dear developers,
I would like to know the physical meaning related to the input tag created during real time simulation.

i) How to set this dephasing value
%DephMatrix # [RT] Dephasing Matrix (bnd1 | bnd2 | kpt | dephasing(fs) |)
1|1|1|-1.000000|

ii) From the given link (https://journals.aps.org/prb/abstract/1 ... .84.245110) equation 34., it is mentioned that lifetime of the
perturbed electronic population can be given as a input parameter. I could not get the input variable corresponding to (life time) from input.

Any help will be appreciated.

Regards,
Bramhachari Khamari
Post Doctoral Fellow
Department of Physics
IIT Kanpur, India.

Bramhachari Khamari
Posts: 89
Joined: Wed Oct 23, 2019 5:52 am

Re: Meaning of input tag generated in real time simulation

Post by Bramhachari Khamari » Thu Oct 14, 2021 11:33 am

Dear developers,
I would also like to know the physical meaning of PhLifeTime from input of real time.

PhLifeTime=100.000000 fs # [RT] Constant Dephasing Time

Is this the life time of the perturbed electronic system that is mentioned in equation 34 of the following link (https://journals.aps.org/prb/abstract/1 ... .84.245110).

Regards,
Bramhachari Khamari
Post Doctoral Fellow
Department of Physics
IIT Kanpur, India.

User avatar
claudio
Posts: 361
Joined: Tue Mar 31, 2009 11:33 pm
Contact:

Re: Meaning of input tag generated in real time simulation

Post by claudio » Thu Oct 14, 2021 12:58 pm

Dear Bramhachari Khamari

the PhaseLifeTime is the inverse of off-diagonal term of the matrix (of the Eq. 34)

\Gamma_{n1,n2} for n1/=n2

while the RadLifeTime is inverse of the diagonal term

\Gamma_{n1,n2} for n1==n2

so a large life-time means a small smearing in linear response, while
a short life-time correspond to a large smearing.

best
Claudio
Claudio Attaccalite
[CNRS/ Aix-Marseille Université/ CINaM laborarory / TSN department
Campus de Luminy – Case 913
13288 MARSEILLE Cedex 09
web site: http://www.attaccalite.com

Bramhachari Khamari
Posts: 89
Joined: Wed Oct 23, 2019 5:52 am

Re: Meaning of input tag generated in real time simulation

Post by Bramhachari Khamari » Fri Oct 15, 2021 6:49 am

Dear Sir,
Thanks a lot for the quick reply. Following two things I would like to clarify

i) RadLifetime represents life time of the electronic population and Phaselifetime denotes dephasing rate of equation 34 of the above link. Is this correct?

ii) If I apply a strong pulse then how much value should I set for RadLifetime and Phaselifetime.


Regards,
Bramhachari Khamari
Post Doctoral Fellow
Department of Physics
IIT Kanpur, India.

Post Reply