|연사||Dr. Ji Hun Sim (POSTECH)|
Dynamical mean field theory studies on heavy fermion system
Dec. 11 (Fri.), 15:45 PM, E6-2. 1st fl. #1323
Dr. Ji Hun Sim, POSTECH
In f electron-based heavy fermion compounds, the temperature dependent behavior of the f electron is determined by the competition between Kondo effect and RKKY interaction. The f electron's magnetic moments bind to the itinerant quasiparticles to form composite heavy quasiparticle bands at low temperature to produce a large Fermi surface. When the f electrons are localized free moments, a small Fermi surface is induced with the absence of coherent contribution from f electrons. In the dynamical mean field theory approach of Ce-based heavy fermion compounds, we addressed that the Fermi surface sizes and their effective masses show continuous logarithmic scaling behavior (~ ln(T0/T)) with different characteristic temperatures.[1,2] Under the pressure or chemical doping, the temperature scale can be changed which is related to the movement of the quantum critical point.[3,4] Also, the role of crystalline electric field (CEF) to the spectral function has been investigated in YbRh2Si2 with well-defined CEF splitting. We describe the CEF multiplet Kondo resonance peaks similar to recent experimental observation  and suggest that the CEF effect enhances the localization of the Yb ions under pressure. We will also discuss the temperature evolution of Kondo resonance band observed in topological Kondo insulator such as SmB6 and YbB6.
 H. C. Choi et al, Phys. Rev. Lett., 108, 016402 (2012).
 H. C. Choi et al, Phys. Rev. B, 88, 125111 (2013).
 J. H. Shim et al, Science 318, 1615 (2007).
 S. Seo et al, Nat. Commun. 6, 6433 (2015).
 S. Ernst et al., Nature (London) 474, 362 (2011).
 O. Trovarelli et al., Phys. Rev. Lett. 85, 626 (2000).
 J. Denlinger et al., arXiv:1312.6637
Contact: Heung Sun Sim, Physics Dept., (email@example.com)
|공지||2019/09/18 - 12/5||Seminar Room #1323||Prof. David Schuster and etc.||Fall 2019: Physics Seminar Serises|
|공지||2019/09/02 - 12/09||Seminar Room 1501||이호성 박사 (한국표준과학연구원) and etc.||Fall 2019: Physics Colloquium|
|105||May 9 (Thu.), 16:00 PM||#1323, E6-2||Prof. Kwang Geol Lee||Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters|
|104||May 9 (Wed.), 04:00 PM||#1323, E6-2||Prof. Jong-Soo Rhyee||Recent advances in thermoelectric bulk composites|
|103||May. 11 (Fri.), 02:30 PM||E6-2. 1st fl. #1323||Dr. Kun Woo Kim||Disordered Floquet topological insulators|
|102||May. 11 (Fri.), 04:00 PM||E6-2. 1st fl. #1323||Dr. Nam Kim||암페어 단위 재정의와 단전자 펌프 소자 개발|
|101||May. 12 (Fri.), 01:30 PM||E6-2. 1st fl. #1323||Dr. Young Kuk Kim||Topological Dirac insulator|
|100||May. 17 (Thu.), 01:30 PM||E6-2. 1st fl. #1323||Prof. Yong-Baek Kim University of Toronto||Quantum Spin Liquid in Kitaev Materials|
|99||May. 3 (Fri), 11:00 AM||E6-2. 2st fl. #2502||Prof. Changhee Sohn||Exotic Magnetism|
|98||May. 8th (Wed), 16:00||E6 Room(#1323)||Jieun Lee||Imaging valley dependent electron transport in 2D semiconductors|
|97||Nov 17th 12:00 PM||Online(Zoom)||Prof. Qiang Lin (Univ. of Rochester, USA)||Quantum- & Nano-Photonics" 세미나 시리즈|
|96||Nov. 04 (Fri), 1:30 PM||E6-2. #1323(1st fl.)||Dr. Jonghyun Song, Department of Physics, Chungnam National University||Exotic phenomena at oxide LaAlO3/SrTiO3 hetero-interface and their applications|
|95||Nov. 04 (Fri), 3:00 PM||E6-2. #1323(1st fl.)||Dr. Dohun Kim, Department of Physics and Astronomy, SNU||Quantum information experiments using few electron spins in semiconductors|
|94||Nov. 1 (Fri.), 02:30 PM||E6-2. 1st fl. #1323||Dr. YoungWook Kim||Squeezing the best out of 2D materials|
|93||Nov. 1 (Fri.), 04:00 PM||E6-2. 1st fl. #1323||Dr. Ju-Jin Kim||Electron transport through weak-bonded contact metal with low dimensional nano-material|
|92||Nov. 1 (Tue.) 2:30 pm||Seminar Room #1323(E6-2)||Prof. Youngjoon Kwon, Yonsei Univ.||Search for dark sector particles in the B-factory experiments|
|91||Nov. 10th(Thu) 4 p.m.||E6-2. #1323(1st fl.)||Prof. Min Seok Jang, Electrical Engineering, KAIST||Low Dimensional Active Plasmonics and Electron Optics in Graphene|
|90||Nov. 11th (Fri), 4 p.m.||#1323(E6-2. 1st fl.)||Dr. Bohm-Jung Yang, SNU||Dirac fermions in condensed matters|
|89||Nov. 11th(Fri), 1:30 p.m.||#1323(E6-2. 1st fl.)||Dr. Keun Su Kim, POSTECH||Bandgap Engineering of Black Phosphorus|
|88||Nov. 12 (Thu.) 4:00 PM||E6-2 1323||김영덕 (Young Duck Kim) 교수||2020 가을학기 광학분야 특별세미나|
|87||Nov. 16 (Wed), 4p.m.||#1323(E6-2. 1st fl.)||Dr. Heung-Sik Kim , University of Toronto||Realizing Haldane Model in Fe-based Honeycomb Ferromagnetic Insulators|
|86||Nov. 18th (Fri) 10:30 a.m.||#5318(5th fl.)||Dr. 최 순 원, Havard University||Non-equilibrium many-body spin dynamics in diamond|