Electron-Hole Asymmetry in the Dynamic Hubbard Model

2010 ◽  
Vol 24 (5) ◽  
pp. 1571-1575 ◽  
Author(s):  
G. H. Bach ◽  
F. Marsiglio
Keyword(s):  
Hubbard Model ◽  
Electron Hole ◽  
Dynamic Hubbard Model

Mott transition in the dynamic Hubbard model within slave boson mean-field approach

2014 ◽  
Vol 28 (10) ◽  
pp. 1450078 ◽  
Author(s):  
Duc-Anh Le
Keyword(s):  
Hubbard Model ◽  
Quantum Monte Carlo ◽  
Coupling Parameter ◽  
Mean Field Theory ◽  
Mean Field ◽  
Mott Transition ◽  
Electron Hole ◽  
Field Approach ◽  
Hubbard Interaction ◽  
Dynamic Hubbard Model

At zero temperature, the Kotliar–Ruckenstein slave boson mean-field approach is applied to the dynamic Hubbard model. In this paper, the influences of the dynamics of the auxiliary boson field on the Mott transition are investigated. At finite boson frequency, the Mott-type features of the Hubbard model is found to be enhanced by increasing the pseudospin coupling parameter g. For sufficiently large pseudospin coupling g, the Mott transition occurs even for modest values of the bare Hubbard interaction U. The lack of electron–hole symmetry is highlighted through the quasiparticle weight. Our results are in good agreement with the ones obtained by two-site dynamical mean-field theory and determinant quantum Monte Carlo simulation.

scholarly journals Emergence of quasiparticles in a doped Mott insulator

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Yao Wang ◽  
Yu He ◽  
Krzysztof Wohlfeld ◽  
Makoto Hashimoto ◽  
Edwin W. Huang ◽  
...  
Keyword(s):  
Hubbard Model ◽  
Single Layer ◽  
Mott Insulator ◽  
Spectral Weight ◽  
Particle Spectrum ◽  
Electron Hole ◽  
Strong Electron ◽  
Side Band ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Weakly Coupled

AbstractHow a Mott insulator develops into a weakly coupled metal upon doping is a central question to understanding various emergent correlated phenomena. To analyze this evolution and its connection to the high-Tc cuprates, we study the single-particle spectrum for the doped Hubbard model using cluster perturbation theory on superclusters. Starting from extremely low doping, we identify a heavily renormalized quasiparticle dispersion that immediately develops across the Fermi level, and a weakening polaronic side band at higher binding energy. The quasiparticle spectral weight roughly grows at twice the rate of doping in the low doping regime, but this rate is halved at optimal doping. In the heavily doped regime, we find both strong electron-hole asymmetry and a persistent presence of Mott spectral features. Finally, we discuss the applicability of the single-band Hubbard model to describe the evolution of nodal spectra measured by angle-resolved photoemission spectroscopy (ARPES) on the single-layer cuprate La2−xSrxCuO4 (0 ≤ x ≤ 0.15). This work benchmarks the predictive power of the Hubbard model for electronic properties of high-Tc cuprates.

scholarly journals Dynamic Hubbard model: Effect of finite boson frequency

2003 ◽  
Vol 68 (22) ◽  
Author(s):  
F. Marsiglio ◽  
R. Teshima ◽  
J. E. Hirsch
Keyword(s):  
Hubbard Model ◽  
Dynamic Hubbard Model

Cluster perturbation study of 1D electron-hole Hubbard model

2008 ◽  
Vol 245 (12) ◽  
pp. 2729-2732 ◽  
Author(s):  
Kenichi Asano ◽  
Takuto Nishida ◽  
Tetsuo Ogawa
Keyword(s):  
Hubbard Model ◽  
Electron Hole
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