Faculty of Physics, Hanoi University of Science



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Bộ môn Tin học Vật lý trân trọng kính mời mọi người đến dự Seminar buổi sáng thứ 6 ngày 18/12/2015:



Date: Fri.18th Dec. /Time: 8 am – 10 am / Place: Room 408F, Building T1

334 Nguyễn Trãi, Thanh Xuân, HàNội

Kính mời mọi người đến dự / Everyone is welcome !


(Keynote)Speaker 1 (8am-9am):

Dr.Giang Bach (Computational Materials Science Laboratory, Faculty of Physics, VNU University of Science)

Title:Dynamical mean field theory in solving the dynamic Hubbard models

Abstract: Dynamical mean field approximation (DMFT) is widely used in solving strongly correlated electron models. The advantage of dynamical mean field theory is that it considers the local quantum

fluctuations which are much more important in the strongly interacting systems. The local nature of

quantum fluctuations is fortunately captured in the single impurity Anderson model so that the real

infinite lattice problems are mapped onto finite lattice problems which are feasibly solved. In this talk, I will present an overview about the success of the dynamical mean field theory applied in the Dynamic Hubbard models. These models consider the modification of on-site Coulomb repulsion due to the orbital relaxation when lattice sites are doubly occupied. The prominent characteristic of the dynamic Hubbard model is the broken electron-hole symmetry which drives many other crucial features such as superconductivity with lowering kinetic energy mechanism.

Reference:Phys. Rev. B 82, 155122 (2010); Phys. Rev. B 85, 155134 (2012); J. Low. Temp. Phys. 181, 253 (2015).

Speaker 2 (9:15 am-9:50am):

Mr. La Minh Tuan (Department of Computational Physics and Applied Informatics, Faculty of Physics, VNU University of Science)

Title:Geiger tube-based network for radiation monitoring

Abstract:The project showsthe concept, process and several results of a research on design and fabrication of a network for radiation monitoring based on Geiger-Muller detectors, microcontrollers in combination with GPS, GPRS/GSM modules. The microcontroller ARM 32-bit STM32F103-based systems are programmed to work as standalone stations. Each station is located by GPS data and it automatically pushes collected data via GPRS into webserver every two minutes. The webserver stores, analyses and displays data on a map through web interface. The station can also be manipulated through SMS commands by an authorized phone number. Through our test on the system, it is expected to operate stably, and it can be used easily for wireless radiation safety monitoring around nuclear stations, nuclear laboratories, etc. Furthermore, the model is promising to beapt to monitor other environmental parameters by combining with temperature sensors, humidity sensors, and ambient air quality sensors.

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