[phys4phys] SCL online seminar: Nenad Vukmirovic, Thursday, 25 February, 14:00

[Antun Balaz]

Dear colleagues,

You are cordially invited to the SCL online seminar of the Center for the Study of Complex Systems, which will be held on Thursday, 25 February 2021 at 14:00 on Zoom (link is given below). The talk entitled

Pieces of physics behind electron mobility in materials: the case of II-VI semiconductors

will be given by Dr. Nenad Vukmirović (Scientific Computing Laboratory, Center for the Study of Complex Systems, Institute of Physics Belgrade). Abstract of the talk:

Electronic components based on semiconducting materials are present in our everyday life in a variety of devices. The main physical process that takes place in these devices is electronic transport through the material which is quantified by the electron mobility. Despite a tremendous progress in prediction of material properties from the crystal structure, it is still quite difficult to reliably calculate the electron mobility in a semiconducting material.

In this talk, the methodology for obtaining the electronic states, the phonon modes and the electron-phonon coupling constants within density functional theory will first be reviewed. Particular focus will be given on physical considerations necessary to perform accurate interpolation of electron-phonon coupling constants to a dense momentum grid in the first Brillouin zone. Modifications of the methodology necessary to correct for known shortcomings of local approximations in density functional theory will then be introduced. Our numerical implementation of the whole procedure for calculation of mobility from electron-phonon coupling constants will be briefly presented. Next, the results for temperature dependence of mobility in ZnSe, CdTe, ZnTe and CdSe will be shown and compared to experimental results from the literature. Finally, two simpler models which can be used to calculate the mobility will be introduced and their range of validity will be discussed.

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Time: Feb 25, 2021 14:00 Belgrade
https://us02web.zoom.us/j/81156953876?pwd=eHJxcXp1VnZzWlhXM0lZb1l5NGpldz09

Meeting ID: 811 5695 3876
Passcode: 397562
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Best regards,
Antun Balaž

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Dr. Antun Balaž
Research Professor

http://www.scl.rs/antun
Phone: +381 11 3713152
Fax: +381 11 3162190

Scientific Computing Laboratory
Center for the Study of Complex Systems

Institute of Physics Belgrade
National Institute of the Republic of Serbia
Pregrevica 118, 11080 Belgrade, Serbia
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