Research Subjects

Research Subjects (연구과제)

What is the condensed matter physics (물성물리란)?

Thesis subjects of group alumni (졸업생 학위논문 제목)

Talks and Presentations (학회 발표논문) : International, Domestic

Current activities (pdf) (연구실 최근 연구동향 (2002년 현재)

Search for spintronic materials (pdf) (2002 Spin-forum 발표자료)

Magnetism: some issues and understandings (pdf) (Muju2002 발표자료)

Topological Kondo/mixed-valence insulator: SmB6 (pdf) (APS 2015 발표자료)


Electronic structure calculations using the Density Functional Theory (밀도함수이론을 이용한 전자구조 계산)

  • Magnetism.

  • Electronic and Phonon Band Structure theory.

  • Numerical simulations : Quantum Monte-Carlo, Molecular Dynamics.

  • DFT, DFT+U, DFT-GW, DFT-DMFT methods.

  • Spin-orbit interaction, Orbital moment, Topological Kondo insulator

  • Electronic, Magnetic, and Structural Properties of Solids.

  • Spintronic materials: Half-metals, Dilute magnetic semiconductors (DMS)

  • Topological Kondo/mixed-valence Insulator

  • Analysis of PES (photoemission spectroscopy) and XMCD (X-ray magnetic circular dichroism).

We study electronic structures of transition and rare earth metals, and phenomena related to those materials. Various calculational tools using the Density functional Theory (DFT) are utilized in our laboratory: Full-Potential-Augmented-Plane-Wave (FLAPW) band method, Linearized-Muffin-Tin-Orbital (LMTO) band method, and Tight-Binding LMTO Recursion band method.

We investigate the equilibrium geometries, electronic, and magnetic properties of solids. We have also a close collaboration with experimental groups. For example, results of the photoemission spectroscopy are compared with our density of states of solids, which can be obtained in our laboratory.

Key Words: Electronic Structure, Magnetism, DFT, DMFT, FLAPW, LMTO, TB-LMTO, Transition Metals, Rare-earth Materials


Many-body effects in condensed matter systems (응집물질계에서의 다체효과)

  • Magnetism and Superconductivity.

  • Many Body Theory : Green's function, Projection Operator formalism.

  • Strongly Correlated : Narrow Band systems, Low Dimensional systems.

  • Electron Gas system, Anderson, Hubbard model Halmiltonians.

  • Kondo effect, Mixed-valence and Heavy-Fermion phenomena.

  • Electron-Phonon Interaction in metals.

  • CMR (Colossal Magneto-Resistance) in Manganese Oxides, Small polarons, Magnetic polarons.

  • Jahn-Teller effects and Orbital orderings in magnetic oxides.

  • Impurity effects in low dimensional systems.


Analysis of PES (photoemission spectroscopy) and XMCD (X-ray magnetic circular dichroism)

  • Researches using synchrotron radiation.

  • Magnetic Multilayers, Metallic films.

  • GMR (Giant Magneto-Resistance), Magneto-optical effect.