visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2015-12-11 15:45 
연사  
장소 E6-2, #1323 

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 [5] and suggest that the CEF effect enhances the localization of the Yb ions under pressure.[6] We will also discuss the temperature evolution of Kondo resonance band observed in topological Kondo insulator such as SmB6 and YbB6.[7]

 

References 
[1] H. C. Choi et al, Phys. Rev. Lett., 108, 016402 (2012).
[2] H. C. Choi et al, Phys. Rev. B, 88, 125111 (2013). 
[3] J. H. Shim et al, Science 318, 1615 (2007).
[4] S. Seo et al, Nat. Commun. 6, 6433 (2015).
[5] S. Ernst et al., Nature (London) 474, 362 (2011).
[6] O. Trovarelli et al., Phys. Rev. Lett. 85, 626 (2000).
[7] J. Denlinger et al., arXiv:1312.6637

 

Contact: Heung Sun Sim, Physics Dept., (hs_sim@kaist.ac.kr)

 

번호 날짜 연사 제목
공지 2025-04-29 10:00  Dr. Yeonju Go (Brookhaven National Laboratory)  Exploring the Hottest Matter in the Universe: Quark-Gluon Plasma through Hard Probes and Artificial Intelligence
공지 2025-05-01 16:00  Dr. Inwook Kim (Lawrence Livermore National Laboratory)  BSM Physics Search with Quantum Sensors
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
193 2020-10-15 17:00    Time crystals, quasicrystals, and time crystal dynamics in the superfluid universe file
192 2022-03-31 10:00    Weiss fields for Quantum Spin Dynamics file
191 2022-03-29 10:00    Non-reciprocal phase transitions file
190 2024-05-16 14:30    [Astrophysics Seminar] Observational Cosmology with Superconducting Sensors
189 2024-05-30 10:00    Quasiperiodic Effects in Quasicrystals
188 2018-11-09 14:30    Moiré superlattices – from twisted bilayer graphene to quasicrystal file
187 2015-10-16 15:00    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
186 2018-07-02 15:00    High Precision Magnetic Field Measurement for the Muon g-2 Experiment file
185 2016-06-01 10:30    Welcome to Nature Photonics
184 2025-04-22 16:00  Dr. Nanse Esaki (The University of Tokyo)  Spin Nernst and thermal Hall effects of topological triplons in quantum dimer magnets on the maple-leaf and star lattices file
183 2018-05-11 16:00    암페어 단위 재정의와 단전자 펌프 소자 개발 file
182 2016-04-26 16:00    Transport spectroscopy for electronic bands in carbon-based nanomaterials with weak-bond contacts
181 2022-08-12 10:00    Twisted Bilayer Magnets file
180 2022-08-12 10:00    Twisted Bilayer Magnets file
179 2022-10-06 13:00    Counting States with Global Symmetry
178 2019-06-12 15:00    The relation between free and interacting fermionic SPT phases file
177 2016-09-29 16:00    Exploring the phase diagram of BaBiO3: epic voyage of just another bad trip?
176 2017-04-28 16:00    Carbon nanotubes coupled to superconducting impedance matching circuits
175 2023-07-11 11:00    Ordered phases, non-Fermi liquid, and quantum criticality driven by entanglement between multipoles and conduction electrons
174 2019-07-30 16:00    Dirac fermions and flat bands in correlated kagome metals file