Quantum-Field-Theory Approach to the Heisenberg Ferromagnet

1968 ◽  
Vol 167 (2) ◽  
pp. 434-444 ◽  
Author(s):  
H. J. Spencer
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Heisenberg Ferromagnet ◽  
Theory Approach ◽  
Quantum Field

scholarly journals Quantum Field Theory Approach to the Optical Conductivity of Strained and Deformed Graphene

2015 ◽  
Vol 56 (11-12) ◽  
pp. 915-922 ◽  
Author(s):  
W. de Paula ◽  
A. J. Chaves ◽  
O. Oliveira ◽  
T. Frederico
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Optical Conductivity ◽  
Theory Approach ◽  
Quantum Field

A Quantum Field Theory Approach to Simple Liquids: The Elementary Excitations of Helium 4

1997 ◽  
Vol 11 (03) ◽  
pp. 337-354
Author(s):  
R. Mele ◽  
G. Preparata ◽  
S. Villa
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Mean Field ◽  
Field Approximation ◽  
Mean Field Approximation ◽  
Theory Approach ◽  
Quantum Field ◽  
Static Structure ◽  
Loop Correction ◽  
Simple Liquids

In the framework of Quantum Field Theory we propose a novel approach to the theory of bosonic simple liquids, formulated in terms of a scalar, complex quantum field, the wave-field Ψ(x,t). The problem is treated in a mean-field approximation, diagonalizing the quadratic part of the Hamiltonian à la Bogoliubov and calculating in a perturbative scheme the one-loop correction to the self-energy function. We derive the dispersion relation and the dynamic and static structure factors of the liquid 4 He , obtaining results that are successfully compared with experimental data.

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