Department of Computer Science AGH and IBM Software Laboratory in Krakow invite to Krakow Quantum Informatics Seminar (KQIS)
• understand and discuss current problems in quantum informatics,
• discuss new quantum computing technologies,
• exchange ideas and research results,
• integrate information across different research teams,
• build a community around quantum informatics.
Venue: Centrum Informatyki (D17) ul. Kawiory 21, 30-055 Kraków, room 1.19
Tuesday, 19th of November, 2019, 9:30-11:00
Zbigniew Kąkol, Faculty of Physics and Applied Computer Science, AGH, Krakow
Topic: Topological Insulators – in search of new materials for microelectronics/information technology
The discovery of topological insulators (TI) has sparked extensive investigations of new materials with nontrivial topological order i.e. where change of topological order results in metallic or even superconducting states that are protected against dopants, defects, and impurities. The metallic surface states, with the characteristic Dirac like linear dispersion relation are due to non-trivial topology of the electronic structure. The dissipationless spin currents that exists in the topological surface state in equilibrium are expected to be useful for low energy consumption spintronics devices and attracts strong interest from the innovative technology industry.
This talk gives general description of physical properties of TI followed by brief, nonmathematical, introduction to the density functional theory (DFT) which is currently the most successful method for studying the electronic structure of matter. DFT is effectively exploit in solid state physics, physical chemistry, modern electronics, and other fields were the understanding of materials properties on the atomic scale is a necessity. It works for atoms, molecules, solids, liquids and plasmas. It became very popular since it provides a useful balance between accuracy and computational costs.