• HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-11-25 11:00 
일시 Nov. 25 (Fri), 11:00AM 
장소 E6-2 #1323 
연사 이승섭(서울대 물리천문학부 교수) 
세미나 영상은 아래 링크로 확인 바랍니다. (공개기간: 2023.01.10-2024.01.09, 1년)
1. Date / Time 
    - Nov  25, 2022
    - 11:00 AM (KST)
2. Place: E6-2 #1323
3. Speaker
    - 이승섭 (서울대 물리천문학부 교수)
4. Talk Title
    -  DMFT+NRG: From models to real materials, from local to nonlocal correlations
5. Abstract
In this talk, I will describe a powerful numerical approach for studying strongly correlated systems, which uses the numerical renormalization group (NRG) as an impurity solver of dynamical mean-field theory (DMFT). Based on recent methodological advances made by my colleagues and me, I have established an NRG method that can handle first-principles calculations and nonlocal electronic correlations. It provides accurate real-frequency dynamical properties for low system temperatures, which goes beyond the reach of other methods, such as quantum Monte Carlo. Such strengths are demonstrated in our studies: We clarified the key characteristics of Hund metals, namely spin-orbital separation [1, 2] and orbital differentiation [3], in model systems as well as strontium ruthenate [4]. We also investigated intriguing quantum critical behaviors in heavy-fermion systems [5]. Last but not least, I will introduce our recent breakthrough in the theory of multipoint correlation functions [6, 7], which describe inelastic scattering and nonlocal correlations.
[1] E. Walter, K. M. Stadler, S.-S. B. Lee*, Y. Wang, G. Kotliar, A. Weichselbaum, and J. von Delft, Phys. Rev. X 10, 031052 (2020).
[2] Y. Wang, E. Walter, S.-S. B. Lee, K. M. Stadler, J. von Delft, A. Weichselbaum, and G. Kotliar, Phys. Rev. Lett. 124, 136406 (2020).
[3] F. B. Kugler, S.-S. B. Lee, A. Weichselbaum, G. Kotliar, and J. von Delft, Phys. Rev. B 100, 115159 (2019).
[4] F. B. Kugler, M. Zingl, H. U. R. Strand, S.-S. B. Lee, J. von Delft, and A. Georges, Phys. Rev. Lett. 124, 016401 (2020).
[5] A. Gleis, S.-S. B. Lee, A. Weichselbaum, G. Kotliar, and J. von Delft, in preparation.
[6] F. B. Kugler*, S.-S. B. Lee*, and J. von Delft, Phys. Rev. X 11, 041006 (2021). (*: These authors are contributed equally to this work.)
[7] S.-S. B. Lee, F. B. Kugler, and J. von Delft, Phys. Rev. X 11, 041007 (2021).
번호 날짜 장소 제목
공지 2023-02-27 12:00  E6-1 #1501  2023 봄학기 콜로키움 전체 일정
공지 2023-03-16 16:00  E6-2 #1323  2023 봄학기 광학분야 및 응집물리 특별세미나 전체 일정
319 2020-08-25 20:00  Zoom webinar  KAIST Global Forum for Spin and Beyond (Second Forum) file
318 2017-08-16 16:00  #1322 (E6-2. 1st fl.)  Phonon-driven spin-Floquet valleytro-magnetism file
317 2020-08-17 20:00  Zoom webinar  Using magnetic tunnel junctions to compute like the brain file
316 2022-08-01 10:00  E6 #1501 & Zoom  [Update 세미나 영상] James Webb Space Telescope & OTE Commissioning
315 2017-08-31 14:00  #5318(E6-2. 5th fl.)  “Berry phase and nonlinear response: photocurrent in noncentrosymmetric insulators and Weyl semimetals” file
314 2016-08-04 14:30  KAIST Natural Science Building (E6-5), EDU 3.0 Room(1st fl.)  Relational Logic (with applications to Quantum Mechanics, String Theory, Cosmology, Neutrino Oscillations, Statistical Mechanics)
313 2022-08-08 14:00  E6-2 #2502  Classical Shadow Tomography for Analog Quantum Simulators
312 2022-08-09 14:00  KI building (E4), Lecture Room Red (B501)  Quantum biology in fluorescent protein: a new model system to study quantum effects in biology file
311 2022-08-12 10:00  E6-1 #1323  Twisted Bilayer Magnets file
310 2022-08-12 10:00  E6-1 #1323  Twisted Bilayer Magnets file
309 2022-08-17 11:00  E6-6 #118호  Robust Hamiltonian Engineering of Large Quantum Systems (큰 양자시스템의 견고한 해밀토니안 엔지니어링)
308 2022-08-18 10:00  E6-1 #1323  Disorder-driven phase transition in the second-order non-Hermitian skin effect
307 2018-08-01 11:00  양분순 빌딩 (E16-1) 207호  Future of AI: Is the brain a computer? file
306 2019-08-27 16:00  Rm. 1323, E6  Critical current properties of Fe-based superconductors file
305 2019-08-14 16:00  Rm. 1323, E6  Quantum Optics, at the heart of quantum metrology and quantum information file
304 2019-08-16 14:00  E6 Room(#1323)  Multiferroic and Magnetoelectric Effects by Tailoring Interfacial Chemistry and Physics in Correlated Oxides file
303 2019-08-01 14:00  E6 Room(#1323)  Low-density Superconductivity in SrTiO3 Probed by Planar Tunneling Spectroscopy file
302 2019-08-06 16:00  E6 Room(#1323)  Visualization of in-plane piezoresponse vector fields file
301 2019-12-27 15:00  #5318, E6-2  The superconducting order parameter puzzle of Sr2RuO4 file
300 2020-12-11 14:30  online  Antisymmetric interlayer exchange coupling in magnetic multilayers