visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2018-04-09 11:00 
일시 Apr. 09 (Mon.), 11:00 AM 
장소 E6-2. 1st fl. #1323 
연사 Dr. Seung-Sup B. Lee 

SRC Seminar

 

 

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

 

Abstract:

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 [3]. A mean-_eld analysis of the low-energy e_ective Hamiltonian [2] 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.

 

[1] S.-S. B. Lee, J. von Delft, and A. Weichselbaum, Phys. Rev. Lett. 119, 236402 (2017).

[2] S.-S. B. Lee, J. von Delft, and A. Weichselbaum, Phys. Rev. B 96, 245106 (2017).

[3] S.-S. B. Lee and A. Weichselbaum, Phys. Rev. B 94, 235127 (2016).

 

Contact: SunYoung Choi, (sunyoungchoi@kaist.ac.kr)

 

Center for Quantum Coherence in Condensed Matter, KAIST

번호 날짜 장소 제목
464 2019-10-15 16:00  #1323, E6-2  Moiré superlattices and graphene quasicrystal file
463 2018-10-15 16:00  #1323, E6-2  Universal properties of macroscopic current-carrying systems file
462 2023-10-11 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  [CAPP seminar] Particle Physics with Neutrinos file
461 2023-10-11 16:00  E6-2, Rm2502  [High Energy Theory Seminar] Axion Magnetic Resonance
460 2018-10-11 16:00  #1323, E6-2  Dirac electrons in a graphene quasicrystal file
459 2023-10-19 11:00  E6-2 #1322  Emergent functionalities of iridium oxide films with different growth orientation file
458 2022-10-07 11:00  E6-2 #1323  [Update 세미나 영상] (응집물리 세미나) Competing orders in a vanadium-based kagome metal monolayer file
457 2022-10-06 13:00  E6 #1323  Counting States with Global Symmetry
456 2022-10-04 16:00  E6 #2501  Distinguishing 6d (1, 0) SCFTs
455 2022-10-28 11:00  E6-2 #1323  [Update 세미나영상] (응집물리 세미나) Machine-Learning-Guided Prediction models and Materials discovery for high Tc cuprates file
454 2016-10-27 16:00  #1323(E6-2)  Terahertz Metal Optics
453 2022-10-27 16:00  E6-2 #1323  (광학분야 세미나) Cavity optomechanical systems for quantum transduction
452 2022-10-26 10:00  E6-2 #2502  Replica Higher-Order Topology of Hofstadter Butterflies in Twisted Bilayer Graphene
451 2019-10-25 15:00  #1323, E6-2  Physics Seminar file
450 2016-10-18 15:00  E6-2. 1st fl. #1323  “Hybrid quantum systems with mechanical oscillators”
449 2016-10-18 13:30  1st fl. #1323(E6-2)  "Visualization of oxygen vacancy in motion and the interplay with electronic conduction"
448 2016-10-17 11:00  #1323,(E6-2, 1st fl.)  IMS and examples of the studies on optoelectronic materials
447 2020-10-16 16:00  https://kaist.zoom.us/j/89198078609  Hidden room-temperature ferroelectricity in CaTiO3 revealed by a metastable octahedral rotation pattern file
446 2020-10-16 14:30  https://kaist.zoom.us/j/89198078609  Nanoscale magnetic resonance detection towards nano MRI file
445 2020-10-15 16:00  (https://kaist.zoom.us/j/93997220310)  Towards resource-efficient and fault-tolerant quantum computation with nonclassical light