|장소||E6-2. 1st fl. #1323|
|일시||Apr. 09 (Mon.), 11:00 AM|
|연사||Dr. Seung-Sup B. Lee|
“Doublon-holon origin of the subpeaks at the Hubbard band edges”
Dr. Seung-Sup B. Lee
Physics Department, LMU Munich
Apr. 09 (Mon.), 11:00 AM
E6-2. 1st fl. #1323
Dynamical mean-feld theory (DMFT) studies frequently observe a new structure in the local spectral function of the SU(2) Fermi-Hubbard model (i.e., one-band Hubbard model) at half _lling: In the metallic phase close to the Mott transition, subpeaks emerge at the inner edges of the Hubbard bands.
Here we demonstrate that these subpeaks originate from the low-energy e_ective interaction of doublon-holon pairs, by investigating how the correlation functions of doublon and holon operators contribute to the subpeaks [1, 2]. We use the numerical renormalization group (NRG) as a DMFT impurity solver to obtain the correlation functions on the real-frequency axis with improved spectral resolution . A mean-_eld analysis of the low-energy e_ective Hamiltonian  provides results consistent with the numerical result.
The subpeaks are associated with a distinctive dispersion that is di_erent from those for quasiparticles and the Hubbard bands. Also, the subpeaks become more pronounced in the SU(N) Hubbard models for larger number N of particle avors, due to the increased degeneracy of doublon-holon pair excitations. Hence we expect that the sub-peaks can be observed in the photoemission spectroscopy experiments of multi-band materials or in the ultracold atom simulation of the SU(N) Hubbard models.
 S.-S. B. Lee, J. von Delft, and A. Weichselbaum, Phys. Rev. Lett. 119, 236402 (2017).
 S.-S. B. Lee, J. von Delft, and A. Weichselbaum, Phys. Rev. B 96, 245106 (2017).
 S.-S. B. Lee and A. Weichselbaum, Phys. Rev. B 94, 235127 (2016).
Contact: SunYoung Choi, (email@example.com)
Center for Quantum Coherence in Condensed Matter, KAIST
|198||July 26, 2018 at 14:00||Room 5318, KAIST Natural Sciences Lecture Hall(E6).||Manki Kim (Department of Physics, Cornell University)||Inflation in String Theory and Backreaction|
|197||Jul 3rd, 2019 (Wed)||E6-2, 2501||Kyung Soo Choi||Many-body quantum electrodynamis (QED) with atoms and photons: A new platform for quantum optics"|
|196||Jun 1 (Wed) 4 PM||#1323(E6-2 1st fl.)||Kil-Byoung Chai, Caltech||Laboratory experiments relevant to mesospheric clouds, Saturn’s rings & astrophysical jets|
|195||2012/02/13-05/14||E6, 1501||Kenji Ohmori (Photo-Molecular Science, IMS)||Physics Colloquium : 2012 Spring|
|194||August. 6th (TUE), 14:00||E6 Room(#1323)||Kanghyun Chu||Visualization of in-plane piezoresponse vector fields|
|193||July 21 - August 2||E6-2,# 5318||Junmou Chen/Thomas Flacke/Kaoru Hagiwara/Junichi Kanzaki/Chris Kelso/Jeong Han Kim/Kyoungchul Kong/Gabriel Lee/Hye-Sung Lee/Ian Lewis||Challenges and Opportunities in Theoretical Particle Physics 2019|
|192||Sep10(Tue), 15:00||#2502, E6-2||Jun Ho Son||(2+1) D Duality Web from 3D Euclidean Lattice|
|191||August. 16th (Fri), 14:00||E6 Room(#1323)||Jinxing Zhang||Multiferroic and Magnetoelectric Effects by Tailoring Interfacial Chemistry and Physics in Correlated Oxides|
|190||May. 17(Mon) 17:00||Zoom webinar||Jing Shi (UC Riverside, USA)||Spin current generation and detection in uniaxial antiferromagnets|
|189||May. 8th (Wed), 16:00||E6 Room(#1323)||Jieun Lee||Imaging valley dependent electron transport in 2D semiconductors|
|188||May. 8th (Wed), 16:00||E6 Room(#1323)||Jieun Lee||Imaging valley dependent electron transport in 2D semiconductors|
|187||June 27 (Thu), 2:00 PM||#2502, E6-2||Hyun-Yong Lee||Gapless Kitaev Spin Liquid to Loop and String Gases|
|186||Jun. 16 (Thu) 4PM||#1323(E6-2, 1st fl.)||Hyochul Kim, Samsung Advanced Institute of Technology||Quantum information processing using quantum dots and photonic crystal cavities|
|185||Dec. 11 (Fri.), 04:00 PM||online||Hyobin Yoo(Sogang Univ.)||Atomic and electronic reconstruction at van der Waals interface in twisted 2D materials|
|184||August. 1st (Thu), 14:00||E6 Room(#1323)||Hyeok Yoon||Low-density Superconductivity in SrTiO3 Probed by Planar Tunneling Spectroscopy|
|183||August 27 (Tue.), 4:00PM||Rm. 1323, E6||Hiroshi Eisaki||Critical current properties of Fe-based superconductors|
|182||January 17 (Fri), 4:00 PM||#1323, E6-2||Hiroki Ikegami||Symmetry Breaking and Topology in Superfluid 3He|
|181||September 26 (Thu.), 16:00 PM||#1323, E6-2||Han Seb Moon||Entanglement Swapping with Autonomous Polarization-Entangled Photon-Pairs from Warm Atomic Ensemble|
|180||Dec 27 (Fri), 3:00 PM||#5318, E6-2||Han Gyeol Suh||The superconducting order parameter puzzle of Sr2RuO4|
|179||December 27(Fri.), 15:00||E6-2,#5318||Han Gyeol Suh||The superconducting order parameter puzzle of Sr2RuO4|