scholarly journals Collective Modes in the Quantum Lattice or Three-Dimensional XY Model. I

1981 ◽  
Vol 66 (3) ◽  
pp. 861-878 ◽  
Author(s):  
T. Aoki ◽  
S. Homma ◽  
H. Nakano
Keyword(s):  
Three Dimensional ◽  
Collective Modes ◽  
Xy Model ◽  
Quantum Lattice

scholarly journals Collective Modes in Quantum Lattice or Three-Dimensional XY Model. II

1982 ◽  
Vol 67 (6) ◽  
pp. 1724-1739
Author(s):  
T. Aoki ◽  
S. Homma ◽  
H. Nakano
Keyword(s):  
Three Dimensional ◽  
Collective Modes ◽  
Xy Model ◽  
Quantum Lattice

Isotropy of three-dimensional quantum lattice Boltzmann schemes

2011 ◽  
Vol 83 (4) ◽  
Author(s):  
P. J. Dellar ◽  
D. Lapitski ◽  
S. Palpacelli ◽  
S. Succi
Keyword(s):  
Lattice Boltzmann ◽  
Three Dimensional ◽  
Quantum Lattice

scholarly journals Collective modes in three-dimensional magnonic vortex crystals

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Max Hänze ◽  
Christian F. Adolff ◽  
Benedikt Schulte ◽  
Jan Möller ◽  
Markus Weigand ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Collective Modes

Current-induced reordering phase transitions of vortex matter in 3D-layered superconductors

2018 ◽  
Vol 32 (25) ◽  
pp. 1850281 ◽  
Author(s):  
Qingmiao Nie ◽  
Haibin Li
Keyword(s):  
Phase Transitions ◽  
Thermal Noise ◽  
Vortex Lattice ◽  
Three Dimensional ◽  
Xy Model ◽  
Vortex Matter ◽  
Nonequilibrium Phase Transitions ◽  
External Current ◽  
Layered Superconductors ◽  
Pinning Potential

Nonequilibrium phase transitions of vortex matter with a strong random pinning potential in layered superconductors are investigated by the three-dimensional frustrated anisotropic XY model and resistively-shunted junction dynamics at low, middle and high-temperatures, respectively. It is found that a disorder to order phase transition driven by an external current can be obtained at a low-temperature, however, a reordering configuration does not occur at a high-temperature. With the competition between thermal noise, disorder pins and current, the vortex matter can even show the reordering process twice at an intermediate temperature, giving a clear evidence of dc driven vortex lattice reorganization.

Effect of Disorder on Driven Vortex Matter in High-Tc Superconductors

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3433-3435
Author(s):  
Qing-Hu Chen ◽  
Xiao Hu
Keyword(s):  
Large Scale ◽  
Three Dimensional ◽  
Xy Model ◽  
Vortex Matter ◽  
High Tc Superconductors ◽  
High Tc ◽  
First Order Phase Transition ◽  
Effect Of Disorder ◽  
First Order Phase ◽  
Large Scale Simulations

We performed large-scale simulations in the current-driven three-dimensional frustrated anisotropic XY model in the presense of point-like defects with resistively-shunted junction dynamics. A moving Bragg (BrG) glass is observed applying the current in the equilibrium BrG state. The first-order phase transition from the moving BrG to the moving smectic is clarified. The effect of disorder become weak once the vortex matter is set in motion.

TOPOLOGICAL EXCITATIONS, SPIN WAVES AND THE ORIGIN OF MASS

1995 ◽  
Vol 09 (22) ◽  
pp. 2937-2947 ◽  
Author(s):  
GAUTAM GOSWAMI
Keyword(s):  
Spin Waves ◽  
Three Dimensional ◽  
Low Energy ◽  
Xy Model ◽  
Mass Generation ◽  
Topological Excitations ◽  
Characteristic Features

Topological aspects of low energy excitations in the form of spin-waves in ferromagnetic systems are studied here. It is pointed out that the generation of spin-waves in three-dimensional Ising fermions can be visualized through the change in chirality. The characteristic features of spin-waves in both the phases of a continuous symmetric XY model are also studied. It is argued that the mass generation of these low energy excitations has a topological origin.

scholarly journals BROAD HISTOGRAM METHOD FOR CONTINUOUS SYSTEMS: THE XY-MODEL

1999 ◽  
Vol 10 (01) ◽  
pp. 95-113 ◽  
Author(s):  
JOSÉ D. MUÑOZ ◽  
HANS J. HERRMANN
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Degrees Of Freedom ◽  
Three Dimensional ◽  
Large Temperature ◽  
Xy Model ◽  
Continuous Systems ◽  
Histogram Method ◽  
Temperature Range ◽  
Cpu Time

We propose a way of implementing the Broad Histogram Monte Carlo method to systems with continuous degrees of freedom, and we apply these ideas to investigate the three-dimensional XY-model with periodic boundary conditions. We have found an excellent agreement between our method and traditional Metropolis results for the energy, the magnetization, the specific heat and the magnetic susceptibility on a very large temperature range. For the calculation of these quantities in the temperature range 0.7<T<4.7 our method took less CPU time than the Metropolis simulations for 16 temperature points in that temperature range. Furthermore, it calculates the whole temperature range 1.2<T<4.7 using only 2.2 times more computer effort than the Histogram Monte Carlo method for the range 2.1<T<2.2. Our way of treatment is general; it can also be applied to other systems with continuous degrees of freedom.

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