Faculty of Physics, Hanoi University of Science

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Friday Seminar Feb 26, 2016

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BỘ MÔN TIN VẬT LÝ, KHOA VẬT LÝ, TRƯỜNG ĐẠI HỌC KHOA HỌC TỰ NHIÊN HÀ NỘI

(Department of Computational Physics and Applied Informatics, Faculty of Physics, VNU University of Science)


Department of Computational Physics and Applied Informatics respectfully invites you to our monthly Seminar:

Seminar

Date: Fri. 26th Feb. /Time: 3 pm – 5 pm / Place: Room 408F, Building T1

334 Nguyễn Trãi, Thanh Xuân, Hà Nội

Kính mời mọi người đến dự / Everyone is welcome!

 

Speaker 1 (3pm-4pm):

Dr. Tran Van Quang (Department of Physics, University of Transport and Communications)

Title: Some applications of density functional theory

Abstract: Density functional theory (DFT) has been used extensively to study the properties of materials from basic science to advanced technology. This talk overviews briefly the principle of DFT and methods to tackle the Kohn-Sham equation, the central equation in DFT. We show its application by applying to study the ground state of several materials from well-known semiconductors such as silicon and its related compounds to artificial compounds, such as SbBiTe3. Structural properties will be examined by minimizing total energy. The transport properties are interested in by analyzing electronic structure, especially the thermoelectric properties are emphasized.

Reference:T. V. Quang and M. Kim, IEEE Trans. Magn. 50 (2014);T. V. Quang, M. Kim, and H. Lim, First-principles electronic structure study of high density Bi ternary compounds for thermoelectric applications, KPS meeting, Dp-V-177, p158, 10/2010.

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Speaker 2 (4:15 pm-4:50pm):

Mr. Nguyen Nguyen Duong(Master 2 of Physics, Aix-Marseille University, France, 2015)

Title: Isotropization of a Cosmic void in Friedmann-Lemaître Universe

Abstract: The dynamics of a void, or more generally, a low-density spherical region in the Universe, as defined by a thin shell separating two media, has been investigated within a Newton-Friedmann model and a Friedmann-Lemaître model. Such an investigation faces to a singularity problem as given by the transition between two media, which has been solved in appropriate manner in each approaches. The main characteristic of such a structure is that it expands rapidly up to match asymptotically the Hubble flow without showing a linear regime at any stage of its evolution. Such an investigation has been generalized to an ellipsoid of revolution within a Newton-Friedmann model. It turns out the ellipticity diminishes as the structure expands with time, which stands for a criteria of stability for a spherical structure. The embedding of this structure in the commoving space provides us with its profile in the redshift space.

Reference: K.-i. Maeda, N. Sakai, and R. Triay, J. of Cosmology and Astroparticle Physics 08 (2011) 026 [arXiv:1103.2007]; H.-H. Fliche and R. Triay, J. of Cosmology and Astroparticle Physics 11 (2010) 022 [arXiv:gr-qc/0607090].