The MFA ground states for the extended Bose-Hubbard model with a three-body constraint

Autor: A. S. Moskvin, E. V. Vasinovich, V. V. Konev, Yu. D. Panov
Rok vydání: 2018
Předmět:
PSEUDOSPIN
QUANTUM CHEMISTRY
Hubbard model
MEAN-FIELD
VECTOR SPACES
FOS: Physical sciences
02 engineering and technology
Bose–Hubbard model
01 natural sciences
Superconductivity (cond-mat.supr-con)
symbols.namesake
QUANTUM MONTE CARLO
MEAN FIELD APPROACH
Quantum mechanics
0103 physical sciences
DEGREES OF FREEDOM (MECHANICS)
BOSONIC HUBBARD MODELS
HUBBARD MODEL
Electrical and Electronic Engineering
010306 general physics
Quantum
EXTERNAL MAGNETIC FIELD
Physics
Valence (chemistry)
Condensed Matter - Superconductivity
MEAN FIELD
Hilbert space
CUPRATES
HILBERT SPACES
MONTE CARLO METHODS
021001 nanoscience & nanotechnology
Condensed Matter Physics
Electronic
Optical and Magnetic Materials
Magnetic field
GROUND STATE
Mean field theory
PSEUDOSPIN FORMALISM
symbols
QUANTUM THEORY
0210 nano-technology
Ground state
BOSE HUBBARD MODEL
COPPER COMPOUNDS
Zdroj: Phys B Condens Matter
Physica B: Condensed Matter
ISSN: 0921-4526
DOI: 10.1016/j.physb.2017.09.037
Popis: We address the intensively studied extended bosonic Hubbard model (EBHM) with truncation of the on-site Hilbert space to the three lowest occupation states n=0,1,2 in frames of the S=1 pseudospin formalism. Similar model was recently proposed to describe the charge degree of freedom in a model high-Tc cuprate with the on-site Hilbert space reduced to the three effective valence centers, nominally Cu^{1+;2+;3+} . With small corrections the model becomes equivalent to a strongly anisotropic S=1 quantum magnet in an external magnetic field. We have applied a generalized mean-field approach and quantum Monte-Carlo technique for the model 2D S=1 system with a two-particle transport to find the ground state phase with its evolution under deviation from half-filling.
9 pages, 3 figures
Databáze: OpenAIRE
Externí odkaz: