Ground state and excitations of the supersymmetric extended Hubbard model with long-range interaction

1996 ◽  
Vol 54 (1) ◽  
pp. 584-587 ◽  
Author(s):  
D. F. Wang ◽  
James T. Liu
Keyword(s):  
Hubbard Model ◽  
Long Range ◽  
Ground State ◽  
Extended Hubbard Model ◽  
Range Interaction ◽  
Long Range Interaction

GENERALIZED WIGNER LATTICES AS A RIEMANN SOLID: FRACTALS IN THE HURWITZ ZETA FUNCTION

2001 ◽  
Vol 15 (22) ◽  
pp. 981-988
Author(s):  
KAZUMOTO IGUCHI
Keyword(s):  
Excitation Energy ◽  
Zeta Function ◽  
Long Range ◽  
Ground State ◽  
Hurwitz Zeta Function ◽  
Fractal Nature ◽  
Range Interaction ◽  
Ground State Configuration ◽  
Long Range Interaction ◽  
State Configuration

We study the ground state configuration and the excitation energy gaps in the strong coupling limit of the extended Hubbard model with a long-range interaction in one dimension. As proved by Hubbard and Pokrovsky and Uimin, the ground state configuration is quasiperiodic and as proved by Bak and Bruinsma, the excitation energy has a finite gap which forms a devil's stair as a function of the density of particles in the system. We show that the quasiperiodicity and the fractal nature of the excitation energy come from the nature of the long-range interaction that is related to the fractal nature of the Hurwitz Zeta function and the Riemann Zeta function.

Phase transformation and Raman spectra in BaTiO3 nanocrystals

2002 ◽  
Vol 718 ◽  
Author(s):  
Jian Yu ◽  
X. J. Meng ◽  
J.L. Sun ◽  
G.S. Wang ◽  
J.H. Chu
Keyword(s):  
Particle Size ◽  
Phase Transformation ◽  
Low Temperature ◽  
Long Range ◽  
Lattice Expansion ◽  
Inversion Symmetry ◽  
Range Interaction ◽  
Cooperative Phenomena ◽  
Long Range Interaction ◽  
Hydrothermal Methods

AbstractIn this paper, size-induced ferroelectricit yweakening, phase transformation, and anomalous lattice expansion are observed in nanocrystalline BaTiO3 (nc-BaTiO3) deriv ed b y low temperature hydrothermal methods, and they are w ellunderstood using the terms of the long-range interaction and its cooperative phenomena altered by particle size in covalen t ionic nanocrystals. In cubic nc-BaTiO3, five modes centerd at 186, 254, 308, 512 and 716 cm-1 are observed Raman active in cubic nanophase, and they are attributed to local rhombohedral distortion breaking inversion-symmetry in cubic nanophase. The254 and 308 cm-1 modes are significantly affected not only by the concentration of hydroxyl defects, but also their particular configuration. And the 806 cm-1 modes found to be closely associated with OH - absorbed on grain boundaries.

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