|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., (firstname.lastname@example.org)
|122||2015/11/23, 1:30PM||E6-2, #1323||Dr. Michael Park (Stanford University)||What's Beyond the Standard Model? Lessons from Run I and what might come in Run II|
|121||Jul. 08 (Fri.) 11:00 AM||#1323(E6-2. 1st fl.)||Dr. Michael Lawler(Binghampton Univ. / Cornell Univ.)||Isostatic magnetism|
|120||May 19, 2016 (Thur.) 3PM||May 19, 2016 (Thur.) 3PM,||Dr. Michael Betz, CERN||The CERN Resonant WISP Search: Development, Results and Lesson-Learned|
|119||2015/10/15, 10AM||E6-2, 5th fl. #5318||Dr. Mark D. Bird (Florida State University)||Development of Large-Bore, High Field Magnets at the NHMFL|
|118||Mar. 24 (Fri.), 2:30 PM||#1323 (1st fl. E6-2).||Dr. MahnSoo Choi||Topological Dynamics|
|117||October 26 (Fri.), 4:00 PM||#1323, E6-2||Dr. Kyusung Hwang||Coexisting triple-point and nodal-line topological magnons and thermal Hall effect in pyrochlore iridates|
|116||2015/07/16, 4PM||E6-2, 1318||Dr. Kyunghan Hong(MIT)||Next-generation ultrafast laser technology for nonlinear optics and strong-field physics|
|115||November 1 (Thu.), 16:00 PM||#1323, E6-2||Dr. KyeoReh Lee||Direct holography from a single snapshot|
|114||2016/03/11 1:30 PM||E6-2. 1st fl. #1501||Dr. Kwon Park||Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder|
|113||2015/12/11, 1:30PM||E6-2, #1323||Dr. KwangYong Choi (Chung-Ang University)||Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9|
|112||7월 29일(목) 오후 2시 ~ 오후 4시||Online seminar||Dr. Kunio Kaneta(KIAS)||Gravitationally Induced Dark Sector and Inflationary Dynamics|
|111||May. 13 (Fri.), 02:30 PM||Zoom webinar||Dr. Kun-Rok Jeon(Department of Physics, Chung-Ang University)||Topological Superconducting Spintronics Towards Zero-Power Computing Technologies|
|110||Dec. 9(Fri), 4p.m.||#1323(E6-2. 1st fl.||Dr. Kun Woo Kim, KIAS||Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator|
|109||May. 11 (Fri.), 02:30 PM||E6-2. 1st fl. #1323||Dr. Kun Woo Kim||Disordered Floquet topological insulators|
|108||May 31 (Tue.) 4 PM||#1323(E6-2, 1st fl.)||Dr. Kimin Kim, KAIST||Understanding 3D tokamak physics towards advanced control of toroidal plasma|
|107||Apr. 01 (Fri.) 2:30 PM||E6-2. 1st fl. #1501||Dr. KICHEON KANG, Chonnam National University||Interference of single charged particles without a loop and dynamic nonlocality|
|106||Nov. 11th(Fri), 1:30 p.m.||#1323(E6-2. 1st fl.)||Dr. Keun Su Kim, POSTECH||Bandgap Engineering of Black Phosphorus|
|105||Jun. 11 (Fri.), 04:00 PM||Online seminar||Dr. Keun Su Kim(Yonsei University)||Pseudogap in surface-doped black phosphorus|
|104||November 29 (Thu.), 16:00 PM||#1323, E6-2||Dr. Kee suk Hong||양자 칸델라 실현을 위한 단일 광자 발생장치 개발|
|103||Apr. 1(Fri.), 04:00 PM||Zoom webinar||Dr. Kayoung Lee (KAIST)||High-field Electron Transport and Interaction Induced Phenomena in 2D Materials|