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 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
466 2015-10-16 16:00    Fluctuations of entropy production in partially masked electric circuits
465 2016-11-01 14:30    Search for dark sector particles in the B-factory experiments
464 2017-04-06 16:00    For whom the Belle tolls
463 2024-07-23 16:00    Spin Conversion Research Towards Novel Spintronic Functionalities file
462 2020-12-23 10:00    Online workshop for Quantitative Phase Imaging file
461 2015-10-23 10:30    How to write a good scientific paper[Open lecture series]
460 2018-05-17 13:30    Quantum Spin Liquid in Kitaev Materials file
459 2023-07-12 11:00    Study of spin-1/2 antiferromagnetic kagome Heisenberg model by symmetric projected entangled simplex states
458 2017-09-13 16:00    An Introduction to Quantum Spin Liquids file
457 2017-09-12 16:00    Exact Solution for the Interacting Kitaev Chain at Symmetric Point file
456 2023-12-08 10:30    Novel transport phenomena in insulators
455 2017-11-08 13:00    “Emergent exotic quasiparticles in quantum spin liquids” file
454 2020-09-22 09:30    Physics and applications of soliton microcombs(Quantum- & Nano-Photonics) file
453 2017-04-05 12:00    2017년 4월 첫수 융합포럼 개최 안내(물리학과 & 원자력 및 양자공학과 공동 개최)/The First Wednesday Multidisciplinary Forum in April 2017 organized by Dept. of Physics & Dept. of Nuclear & Quantum Engineering file
452 2024-11-21 16:00  Prof. Ulrich Höfer  Time-resolved photoemission: From bandstructure to orbital movies file
451 2020-10-09 09:00    Quantum Many-Body Simulation file
450 2023-11-08 10:00    [High Energy Theory seminar] The Vacuum Sector of Asymptotically Isometric Codes
449 2018-05-31 16:00    Dynamic control of optical properties with gated-graphene metamaterials file
448 2023-05-17 16:30    Detecting Hidden Photon Dark Matter via the Excitation of Qubits file
447 2023-02-20 16:00    Physics of ferromagnet/superconductor junctions