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 |
---|---|---|---|---|
232 | Dec. 7 (Fri.), 04:00 PM | E6-2. 1st fl. #1323 | Dr. Joon Ho Jang |
Novel probes of interacting electrons in 2D systems
![]() |
231 | Dec. 8(Thu) 4p.m. | #1323(E6-2. 1st fl.) | Dr. Jinhyoung Lee, Hanyang University | Dynamical Resonance between Two Optical Cavities via Optomechanical Oscillator |
230 | Dec. 9(Fri), 1:30 p.m. | #1323(E6-2. 1st fl.) | Dr. Jae Yoon Cho, POSTECH | Entanglement area law in strongly-correlated systems |
229 | Dec. 9(Fri), 4p.m. | #1323(E6-2. 1st fl. | Dr. Kun Woo Kim, KIAS | Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator |
228 | Dec.10(Thu), 01:55 PM | Zoom | Yin Wen (University of Tokyo) | Consistency of Boltzmann equation and light dark matter from inflaton decay |
227 | Dec.23(Wed), 10:00~16:00 | Online | Prof. YongKeun Park (KAIST) and etc. |
Online workshop for Quantitative Phase Imaging
![]() |
226 | Dec.9(Wed), 10:00AM | Zoom | Prof. Andrew Geraci (Northwestern University) |
Searching for the QCD axion with the ARIADNE experiment
![]() |
225 | December 13 (Fri.), 1:00 PM | #2501, E6-2 | Dr. Chang-Jong Kang |
Computational Material Designs: Current Status and Future Directions
![]() |
224 | December 13 (Fri.), 1:30-4:30 PM | #1323, E6-2 |
Biophysics Mini-symposium at KAIST
![]() | |
223 | December 18 (Tue.), 4:00 PM | #1323, E6-2 | Prof. Shin-ichi Uchida |
Road to Higher Tc Superconductivity
![]() |
222 | December 2(Wed), 10:00AM | Zoom | Prof. Rakshya Katiwada (Illinois Institute of Technology) |
Recent progress in Axion Dark Matter eXperiment (ADMX) technology
![]() |
221 | December 27(Fri.), 15:00 | E6-2,#5318 | Han Gyeol Suh |
The superconducting order parameter puzzle of Sr2RuO4
![]() |
220 | December 3 (Tue.), 4:00 PM | #1323, E6-2 | Dr. Jong Mok Ok |
Toward Quantum Materials with Correlated Oxides
![]() |
219 | December 5 (Thu.), 16:00 PM | #1323, E6-2 | Prof. Soon-Hong Kwon |
Subwavelenth Photonic Devices: From Single Photon Sources to Solar Cell
![]() |
218 | Feb. 1 (Wed.), 2p.m. | #1323(E6-2. 1st fl.) | Dr. Michihisa Yamamoto, Department of Applied Physics, The University of Tokyo | Quantum electron optics using flying electrons |
217 | Feb. 12 (Mon), 3:00pm | #C303, (Creation Hall 3F, KAIST Munji Campus) | Dr. Byeongsu Yang, Kamioka Observatory, Univ. of Tokyo | The recent result of XMASS Experiment |
216 | Feb. 2(Tue) 2:30 PM | Zoom | Prof. Sangsik Kim (Texas Tech University, USA) |
Quantum- & Nano-Photonics 세미나(Integrated Nanophotonics with Metamaterials, Microcomb, and Atomic Systems)
![]() |
215 | Feb. 25 - Jun 3 | Rm. 1501 (E6) |
Spring 2019: Physics Colloquium
![]() | |
214 | Feb.15(Mon), 05:00PM | Zoom | Yoshichika Otani(Tokyo Univ.) |
Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets
![]() |
213 | Feb.17(Wed)~19(Fri), 09:00~11:00AM | Online | Prof. Subir Sachdev (Harvard University) |
석학 대중 강연 및 강의 시리즈
![]() |