Screening of an external magnetic field by spin currents: the infinite U Hubbard model

1993 ◽  
Vol 3 (2) ◽  
pp. 501-513
Author(s):  
J. C. Anglès d'Auriac ◽  
B. Douçot
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Hubbard Model ◽  
Spin Currents

Studies on entanglement entropy for Hubbard model with hole-doping and external magnetic field

2005 ◽  
Vol 346 (1-3) ◽  
pp. 209-216 ◽  
Author(s):  
K.L. Yao ◽  
Y.C. Li ◽  
X.Z. Sun ◽  
Q.M. Liu ◽  
Y. Qin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Hubbard Model ◽  
Entanglement Entropy ◽  
Hole Doping

scholarly journals Phase diagrams of the Kane-Mele-Hubbard model in the presence of an external magnetic field

2017 ◽  
Vol 827 ◽  
pp. 012009
Author(s):  
Ya-Min Quan ◽  
Wei-Cheng Bao ◽  
Wei-Hua Wang ◽  
Da-Yong Liu
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Hubbard Model ◽  
Phase Diagrams

scholarly journals TEMPERATURE DEPENDENCE OF SPIN CURRENTS CARRIED BY JORDAN–WIGNER FERMIONS AND MAGNONS IN INSULATORS

2012 ◽  
Vol 26 (01) ◽  
pp. 1250011
Author(s):  
KOUKI NAKATA
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Temperature Dependence ◽  
Magnetic Field Gradient ◽  
Particle Interaction ◽  
Three Dimensional ◽  
Spin Current ◽  
One Dimensional ◽  
Spin Currents ◽  
The One

The temperature dependence of spin currents in insulators at the finite temperature near zero Kelvin is theoretically studied. The spin currents are carried by Jordan–Wigner fermions and magnons in one- and three-dimensional insulators. These spin currents are generated by the external magnetic field gradient along the quantization axis and also by the two-particle interaction gradient. In one-dimensional insulators, quantum fluctuations are strong and the spin current carried by Jordan–Wigner fermions shows the stronger dependence on temperatures than the one by magnons.

scholarly journals The Influence of Long-Range Hopping on Ferromagnetism in the Hubbard Model

1998 ◽  
Vol 12 (07n08) ◽  
pp. 803-808 ◽  
Author(s):  
Pavol Farkašovský
Keyword(s):  
Magnetic Field ◽  
Phase Diagram ◽  
External Magnetic Field ◽  
Hubbard Model ◽  
Long Range ◽  
General Expression ◽  
Ferromagnetic State ◽  
Critical Value ◽  
Exact Diagonalization ◽  
Matrix Elements

The phase diagram of the Hubbard model in an external magnetic field is examined by extrapolation of small-cluster exact-diagonalization calculations. Using a general expression for the hopping matrix elements (tij ~ q|i-j|) the influence of long-range hopping (band asymmetry) on ferromagnetism in this model is studied. It is found that the long-range hopping (nonzero q) stabilizes ferromagnetism in an external magnetic field for n > 1. In the opposite limit n≤1 the fully polarized ferromagnetic state is generally suppressed with increasing q. The critical value of magnetic field h below which the ferromagnetic state becomes unstable is calculated numerically.

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