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)
345 2023-10-11 16:00    [CAPP seminar] Particle Physics with Neutrinos file
344 2018-07-09 14:00    The principles of collective learning file
343 2023-06-01 16:00    Hall viscosity and topological phenomena
342 2021-03-25 16:00    Search for dark matter axion with Rydberg atoms file
341 2016-08-04 14:30    Relational Logic (with applications to Quantum Mechanics, String Theory, Cosmology, Neutrino Oscillations, Statistical Mechanics)
340 2022-03-25 11:00    (응집물리 세미나) Hund's metallicity in ruthenate systems file
339 2024-05-28 11:00    동적평균장 이론 소개
338 2019-08-22 16:00    Physics and Applications in Nanoelectronics and Nonomechanics file
337 2020-12-09 10:00    Searching for the QCD axion with the ARIADNE experiment file
336 2025-04-21 16:00  Prof. Ambrose Sungseok Seo (Univ of Kentucky)  Condensed matter physics? All you gotta do is just meet me at the ... file
335 2022-08-08 14:00    Classical Shadow Tomography for Analog Quantum Simulators
334 2022-09-21 10:30    [Update 세미나 영상] Distinguished Lecture 'The Magic of Moiré Quantum Matter' Prof. Pablo Jarillo-Herrero(Department of Physics, MIT) file
333 2019-08-19 10:00    Tutorials on Multimode Quantum Optics in the Continuous Variable Regime file
332 2016-10-17 11:00    IMS and examples of the studies on optoelectronic materials
331 2024-04-11 16:00    Theoretical Studies of the Electric Field Induced Thermal Hall Effect in the Quantum Dimer Magnets XCuCl3 (X = Tl, K)
330 2020-11-26 16:00    2020 가을학기 광학분야 특별세미나(Light Engineering Beyond the Diffraction Limit)
329 2024-01-24 15:00    Determination of single molecule loading rate during mechanotransduction file
328 2020-12-11 14:30    Antisymmetric interlayer exchange coupling in magnetic multilayers
327 2025-05-13 16:00  Mr. Heonjoon Park(Univ. Washington, USA)  Fractional Quantum Anomalous Hall Effect file
326 2023-01-09 16:00    Non-Hermitian Hopf-bundle Matter. Moon Jip Park (IBS-PCS)