|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)
|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|
|205||4pm, Sep. 21 (Wed.||E6-2. #2502(2nd fl.)||Dr. Henrik Johannesson , University of Gothenburg (Sweden) and Beijing Computational Science Research Center (China)||Entanglement probe of two-impurity Kondo physics|
|204||Sep. 29 (Thu), 4:00 PM||E6-2. #2501(2nd fl.)||Dr. Minu Kim, Institute for Basic Science, Seoul National University||Exploring the phase diagram of BaBiO3: epic voyage of just another bad trip?|
|203||Oct. 07 (Fri), 4:00 PM||E6-2. #1323(1st fl.)||Dr. Choong Hyun Kim,IBS-CCES, Seoul National University||“Tilt engineering of 4d and 5d transition metal oxides?”|
|202||May 11 (Wed.), 4 PM||E6-2. #1323(1st fl.)||Dr. Bumjoon Kim, Max Planck Institute for Solid State Research||The quest for novel high-temperature superconductors---Prospects and progress in iridates|
|201||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|
|200||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|
|199||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|
|198||May 24 (Tue) 4 PM||E6-2. #1323(1st fl.)||Dr. Euyheon Hwang, SKKU Advanced Institute of Nanotechnology, Sung Kyung Kwan University||Electronic and magnetic properties of 2D transition-metal thiophosphates and tunability of magnetic order with carrier density|
|197||Oct. 07 (Fri), 1:30 PM||E6-2. #1323(1st fl.)||Dr. Suk Bum Chung, IBS-CCES , Seoul National University||“Symmetry and topology in transition metal dichalcogenide?”|
|196||2015/07/15, 2PM||E6-2,1323||Dr. Se Young Park(Rutgers Univ.)||Electronic and optical properties of titanate-based oxide superlattices|
|195||December 27(Fri.), 15:00||E6-2,#5318||Han Gyeol Suh||The superconducting order parameter puzzle of Sr2RuO4|
|194||July 21 - August 2||E6-2,# 5318||Junmou Chen/Thomas Flacke/Kaoru Hagiwara/Junichi Kanzaki/Chris Kelso/Jeong Han Kim/Kyoungchul Kong/Gabriel Lee/Hye-Sung Lee/Ian Lewis||Challenges and Opportunities in Theoretical Particle Physics 2019|
|193||April 6, 2016 (Wed), 3:30 PM||E6-2, RM #1323||Dr. Andrei Matlashov (Los Alamos National Laboratory)||Superconducting Quantum Interference Devices for Precision Detection|
|192||Dec. 15 (Fri.), 9:20 AM||E6-2, Lecture Room #1323||Prof. Jhinhwan Lee 외 9명||Workshop on Magnetism in Unconventional Superconductors 개최|
|191||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|
|190||2015/10/16, 3PM||E6-2, 5th fl. #5318||Dr. Pierre Pugnat , (CNRS-LNCMI)||High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble|
|189||June 14 (THU), 10:00 AM||E6-2, 2nd fl. #2502||Prof. Kenji Toyoda||Phonons and polariton-like particles in trapped ions for quantum computation and quantum simulation|
|188||Jul 3rd, 2019 (Wed)||E6-2, 2501||Kyung Soo Choi||Many-body quantum electrodynamis (QED) with atoms and photons: A new platform for quantum optics"|
|187||2016/03/11-06/09||E6-2, 1501 외||박권(KAIS) 외||Physics Seminar Serises : 2016 Spring|
|186||2015/07/16-07/17||E6-2, 1501||Sang-Wook Cheong (Rutgers Univ.)||KAIST Physics Distinguished Lecture|