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)
394 2022-08-09 14:00    Quantum biology in fluorescent protein: a new model system to study quantum effects in biology file
393 2022-08-08 14:00    Classical Shadow Tomography for Analog Quantum Simulators
392 2022-08-01 10:00    [Update 세미나 영상] James Webb Space Telescope & OTE Commissioning
391 2022-07-21 16:00    Quintessential axions file
390 2022-07-14 15:00    Pure two-dimensional quantum electron liquid and its phase transition
389 2022-07-14 14:15    Hund and electronic correlations in ruthenium-based systems
388 2022-07-14 13:30    Electronic structure and anomalous transport properties of topological materials by first principle calculation
387 2022-06-23 11:00    JILA’s search for the electron’s Electric Dipole Moment (eEDM) to probe physics beyond the standard model file
386 2022-06-10 16:00    Fe5GeTe2의 나선형 자성특성과 자기저항의 전류밀도 의존성 연구 file
385 2022-06-10 14:30    Combinatorial strategy for condensed matter physics: study on rare earth hexaborides thin films file
384 2022-06-10 11:00    Record-quality two-dimensional electron systems file
383 2022-06-03 11:00    (응집물리 세미나) Theoretical Investigation of Exotic Quantum States in Low-dimensional Materials
382 2022-06-03 09:30    (Quantum-&Nano-Photonics Webinar) Seeing glass in a new light: reimagine chalcogenide photonics file
381 2022-05-30 16:00    Light manipulation using 2D layered semiconductors
380 2022-05-27 11:00    Current Status and Future Plans of ADMX file
379 2022-05-26 16:00    (광학분야 특별세미나)Topological photonic devices
378 2022-05-25 16:00    Uncovering New Lampposts for Dark Matter: Continuum or Conformal
377 2022-05-25 14:00    Atomic-level insights into ferroelectric switching and preferred orientation of ultrathin hafnia file
376 2022-05-23 16:00    Novel electronic transport in topological van der Waals magnets
375 2022-05-20 11:00    (응집물리 세미나) Exploration of new polymorphs in van der Waals crystals