Double barrier potential in electrical field with matlab

[Nemanja989]

Hello there :),

I have a problem in calculating transmission probability through double barrier potential in electrical field with matlab. While doing some exercises form http://www.nextnano.de/nextnano3/tutorial/1Dtutorial_Transmission_NEGF.htm, I came to the last one, where external field is applied and transmission probability is plotted. With all the rest examples I had no difficulties, but when electrical field is used I simply can't get good results.

So I would like to get some help if possible :).

First if someone could tell me what happens with transmission curve if we apply electrical field? Is the situation as on linked site? I am no more sure of anything, since I can't find any mistake in mine program. Mine results are attached to this post as pictures and as MATLAB code in word file. It would be big relief to me if someone else could read or test the program, since I get good results for potential, but bad for transmission :( .

 

[mark726]

Hello there!

I understand your frustration with trying to calculate transmission probability through a double barrier potential in an electrical field using MATLAB. This can be a complex problem to solve, and it's common to encounter difficulties along the way. I would be happy to offer some assistance and provide some insights into what may be causing your issues.

Firstly, let's discuss the effect of applying an electrical field on the transmission curve. When an electrical field is applied, it can change the energy levels of the particles in the system, resulting in a shift in the transmission curve. This shift can be either positive or negative, depending on the direction and strength of the electrical field. In some cases, the electrical field can also create additional energy levels, which can further complicate the transmission curve.

Based on your description, it seems like you are following a tutorial from the nextnano website. It's important to note that the material properties and parameters used in the tutorial may not be exactly the same as the ones you are using in your program. Small differences in material properties can have a significant impact on the results, so it's essential to double-check your input values and make sure they are accurate.

It would also be helpful if you could provide more information about the specific issues you are encountering. Are you getting any error messages? Are the results completely off or just slightly different from what you expected? This will help me better understand and troubleshoot the problem.

In the meantime, I took a look at the MATLAB code you provided, and everything seems to be correctly implemented. One suggestion I have is to try plotting the transmission curve for different values of the electrical field to see how it affects the results. This can help you identify any potential errors or inconsistencies in your code.

I hope this helps, and please don't hesitate to reach out if you have any further questions or concerns. Good luck with your calculations!