Messages

1

General Questions and Answers / How to construct a three-terminal device?

« on: June 27, 2020, 04:56 »

Dear Sir or Madam,
           I am trying to make a three-terminal device which the third electrode  is constructed by a actual material not the electrostatic gate,  and i have read the manual but found nothing about it,  So I wonder if we can build three-terminal devices in the current version?

2

General Questions and Answers / scattering matrix

« on: May 1, 2020, 05:32 »

Dear  all ,
       I am trying to calculate the phase shift of  particular eigenchannel,  and  what i  learned is to calculate the scattering matrix  (ref, https://doi.org/10.1103/PhysRevLett.84.2917, equation1),  for convenience , i upload it to the attachment. so , i want to know , is it possible to access the scattering matrix of particular eigenchannel from ATK?  any suggestions would  be  grateful!
      Thank you very much!

3

General Questions and Answers / Re: questions about the inelastic electron spectroscopy

« on: January 3, 2019, 12:35 »

Dear Petr ,
Thanks for your kind reply, i will read the reference listed in the tutorial carefully,

Best regards!
Baihan

4

General Questions and Answers / questions about the inelastic electron spectroscopy

« on: January 1, 2019, 03:41 »

Dear Quantumwise staff,
         Recently,   i have been studying the inelastic electron transmission spectrum (IETS) for two probe molecule system, and i have follow the example in ATKTutorials
https://docs.quantumwise.com/tutorials/inelastic_electron_spectrometry_au_h2_au/inelastic_electron_spectrometry_au_h2_au.html
In XLOE, the current formula is give by I(V,T)
=
\sum_{\lambda}
\Big[
\mathcal{I}^{sym}_{\lambda}(V,T)
\mathcal{T}^{sym}_{\lambda}(\epsilon_F)
+
\mathcal{I}^{asym}_{\lambda}(V,T)
\mathcal{T}^{asym}_{\lambda}(\epsilon_F)
\Big], the current  are divided into symmetric and asymmetric contribution ,  and i am puzzed about  the symmetric and asymmetric transmission function formula , first in Inelastic Transmission  Spectrum analyzer , it divided into positive and negative inelastic transmission again, so should I add them  up , dose it mean in the current formula Tsym? second , i found the data are all real number , but in the formula it should have imaginary number in symmetric transmission part. The last question is about the dimension of the current formula, as you can see , the symmetric and asymmetric inelastic transmission function part  depend on the number of phonons and energy, but the symmetric and asymmetric universal functions depend on the bias , number of phonons and temperature ; so i wonder where is the energy dimension go ?
So, I really need your help and  help me solve the puzzlement!
thanks a lot !