visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2018-04-09 11:00 
연사  
장소 E6-2. 1st fl. #1323 

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 연사 제목
410 2018-06-22 10:00    Success in Research Career file
409 2016-04-18 15:30    First Principles Approaches for Intermolecular Interactions: From Gas-Phase Dimers to Liquid Water and Molecular Crystal Polymorphism file
408 2020-12-02 10:00    Recent progress in Axion Dark Matter eXperiment (ADMX) technology file
407 2020-11-17 12:00    Quantum- & Nano-Photonics" 세미나 시리즈 file
406 2023-05-15 16:00    Role of dark Higgs boson in DM physics and cosmology file
405 2019-10-15 16:00    Moiré superlattices and graphene quasicrystal file
404 2024-07-22 14:00    Nonthermal electronic orders in photo-doped Mott insulators
403 2017-08-16 16:00    Phonon-driven spin-Floquet valleytro-magnetism file
402 2025-02-03 14:00  Prof. Nobuyuki Yoshioka  Towards early fault-tolerant quantum computing file
401 2023-07-14 11:00    Interfaces engineering of thin film oxides
400 2024-07-25 16:00    Generation and Certification of Optical Quantum States for Information Processing file
399 2019-08-14 16:00    Quantum Optics, at the heart of quantum metrology and quantum information file
398 2019-10-17 16:00    Top down manipulation of Waves : From Metamaterials, Correlated Disorder, Quantum Analogy, to Digital Processing file
397 2018-12-27 16:00    Quantum Innovation (QuIN) Laboratory file
396 2023-09-27 16:00    Chiral Magnets: Domain-Wall Skyrmions and String Theory Realization
395 2019-06-04 17:00    Stochastic nature of bacterial eradication using antibiotics file
394 2015-06-03 12:00    The First Wednesday Multidisciplinary Forum file
393 2016-11-10 16:00    Low Dimensional Active Plasmonics and Electron Optics in Graphene
392 2023-07-20 16:00    [CAPP Seminar] Cosmoparticle Physics of Dark Universe file
391 2018-09-07 15:00    Recent developments in density functional theory: From new functionals to the nature of the chemical bond file