Dynamical mean field theory studies on heavy fermion system
2015.12.09 15:30
장소 | E6-2, #1323 |
---|---|
일시 | 2015/12/11, 3:45PM |
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 [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)
댓글 0
번호 | 일시 | 장소 | 연사 | 제목 |
---|---|---|---|---|
100 | Apr. 01 (Fri.) 2:30 PM | E6-2. 1st fl. #1501 | Dr. KICHEON KANG, Chonnam National University | Interference of single charged particles without a loop and dynamic nonlocality |
99 | 8/19 (Mon), 10:00~11:30, 8/22 (Thur), 10:00~11:30 | Rm. 1322, E6-2 | Nicolas Treps |
Tutorials on Multimode Quantum Optics in the Continuous Variable Regime
![]() |
98 | 7월 29일(목) 오후 2시 ~ 오후 4시 | Online seminar | Dr. Kunio Kaneta(KIAS) |
Gravitationally Induced Dark Sector and Inflationary Dynamics
![]() |
97 | 5월27일(목) 오후4시 | 온라인 | 박소현 박사(CERN) / 이혜성 교수(KAIST) |
찾아가는 물리연구 현장(유럽 입자물리학연구소 소개)
![]() |
96 | 5월 17일(화), 11:00 ~ 12:00 | 창의학습관(E11), 406호 | 방준혁 박사(Korea Basic Science Institute, KBSI) | The CERN Resonant WISP Search: Development, Results and Lesson-Learned |
95 | 5.16(월),16:00 | E6, #1501 | 조규붕교수 (HKUST) | Design synthetic topological matter with atoms and lights |
94 | 5. 9(월),16:00 | E6, #1501 | 김창영교수 (서울대) | Searching for new electronic properties in correlated material flatland |
93 | 5. 30(월), 16:00 | E6, #1501 | 공수현교수 (고려대학교 물리학과) | Light manipulation using 2D layered semiconductors |
92 | 5. 23(월),16:00 | E6, #1501 | 김준성교수 (postech 물리학과) | Novel electronic transport in topological van der Waals magnets |
91 | 5. 2(월),16:00 | E6, #1501 | 유상운교수 (한밭대) | What can we learn from the history of science and technology?(우리말강의) |
90 | 4월 18일(월), 15:30~ | KI빌딩(E4), 강의실 B501 (5F) | Prof. Robert A. DiStasio Jr. (Cornell University) |
First Principles Approaches for Intermolecular Interactions: From Gas-Phase Dimers to Liquid Water and Molecular Crystal Polymorphism
![]() |
89 | 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 |
88 | 4pm, 31th March | online | 최현용 (서울대학교 물리천문학부) | (광학분야 특별세미나)Ultrafast time-resolved spectroscopy in topological materials |
87 | 4pm, 28th April | E6 1323 | 유경식 (KAIST 전기및전자공학부) | (광학분야 특별세미나)Adiabaticity and symmetry in optical waveguide design |
86 | 4pm, 26th May | E6 1323 | 황민수 (Department of Physics, Korea University) | (광학분야 특별세미나)Topological photonic devices |
85 | 4pm, 14th April | E6 1323 | 신승우 (KAIST 물리학과) | (광학분야 특별세미나)Holographic tomography of dielectric tensors at optical frequency |
84 | 4pm, 10th May | E6 1323 | 권혁준 (Korea Institute for Advanced Study, KIAS) | (광학분야 특별세미나)Testing quantum thermodynamics using quantum optics |
83 | 4. 4(월), 16:00 | E6, #1501 | 김희철교수 (Postech 물리학과) | New paradigms in Quantum Field Theory |
82 | 4. 25(월), 16:00 | E6, #1501 | 정영욱 책임연구원 (한국원자력연구원) | Ultrafast electron beam, a tool to explore the nanoscopic world of materials(우리말강의) |
81 | 4. 11(월),16:00 | E6, #1501 | 노재동교수 (서울시립대 물리학과) | Emergence of Statistical Mechanics in Quantum Systems |