Author Topic: the scf of iv-curve in some bias did not convengency, some did converge  (Read 1978 times)

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Offline njuxyh

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Hi :
I calculated the iv-curve under 0-2 V, But I found under 1.4,1.6,0.6,0.4.0.2 V the scf calculation did converge, but other bias point did not converge such 0.8,1.0.1.2 .1.8.2.0.
  217   S   [   3.337 ,  19.732 ,  67.456 ]    6.82742   0.82742              |
|  218   S   [   2.275 ,  23.070 ,  67.460 ]    6.36327   0.36327              |
|  219   S   [   4.364 ,  23.102 ,  67.461 ]    6.36487   0.36487              |
+------------------------------------------------------------------------------+
|  99 E =  -356.72 dE =  3.048208e-04 dH =  1.026967e-02                       |
+------------------------------------------------------------------------------+
################################################################################
#                                                                              #
# Warning: The calculation did not converge to the requested tolerance!        #
#                                                                              #
################################################################################
+------------------------------------------------------------------------------+
|                                                                              |
| NEGF DFT Calculation  [Finished Sat Aug 27 18:33:23 2016]                    |
|                                                                              |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
|                                                                              |
| Device DFT Calculation  [Finished Sat Aug 27 18:33:23 2016]                  |
|                                                                              |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
|                                                                              |
| Transmission Spectrum Analysis                                               |
|                                                                              |
+------------------------------------------------------------------------------+

                            |--------------------------------------------------|
Calculating Transmission   : ==================================================
                                                                                           


 so I am wondering how to set the parameter to continue to recalculated the transmission spectrum under converge bias 0.8,1.0.1.2 and 1.8.2.0 V.
my current calculation only has one checkpoint file which including the whole bias 0-2 V.
 

Offline Daniele Stradi

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Hi,

it is quite difficult to say how to modify the convergence parameters without seeing the system and the *.py input script.
Could you attach it here or send it via a private mail?

Thanks,
Daniele