scholarly journals Ground State of the Asymmetric Anderson Model in the T-Matrix Approximation

1979 ◽  
Vol 62 (3) ◽  
pp. 595-607 ◽  
Author(s):  
H. Fukuyama ◽  
A. Sakurai
Keyword(s):  
Anderson Model ◽  
Ground State ◽  
Matrix Approximation ◽  
T Matrix

On the Ground State of B.C.C. 3He

1972 ◽  
Vol 50 (11) ◽  
pp. 1143-1151 ◽  
Author(s):  
H. R. Glyde ◽  
F. C. Khanna
Keyword(s):  
Single Particle ◽  
Ground State ◽  
State Energy ◽  
Solid Helium ◽  
Lattice Dynamic ◽  
Matrix Approximation ◽  
Hartree Fock ◽  
Volume Dependence ◽  
T Matrix ◽  
Good Agreement

The ground state properties of b.c.c. 3He are computed using both the localized single particle functions due to Nosanow and the correlated functions due to Koehler in conjunction with the T-matrix approximation of Glyde and Khanna. The trial functions and T matrix are computed iteratively much as suggested for the Brueckner–Hartree–Fock scheme for nuclear matter. The correlated ground state energy lies ~6 cal/mole below the single particle value and is in good agreement with the observed value of Pandorf and Edwards. The volume dependence, however, is poor suggesting that cubic terms such as incorporated in the improved theory of Goldman et al. are important in solid helium. When combined with lattice dynamic work, the present results suggest correlated functions provide a much better description of solid helium.

Momentum distribution and the universal contact of a unitary Fermi gas with particle-hole fluctuation

2018 ◽  
Vol 32 (21) ◽  
pp. 1850249 ◽  
Author(s):  
Xiao-Xia Ruan ◽  
Hao Gong ◽  
Zheng-Ling Wang ◽  
Hong-Shi Zong
Keyword(s):  
Experimental Data ◽  
Momentum Distribution ◽  
Fermi Gas ◽  
Normal Phase ◽  
Large Momentum ◽  
Matrix Approximation ◽  
Self Consistent ◽  
Theoretical Predictions ◽  
Unitary Fermi Gas ◽  
T Matrix

We compute the momentum distribution of a homogeneous Fermi gas at unitarity in the normal phase within the framework of the non-self-consistent T-matrix approximation with particle-hole fluctuation. From the large-momentum behavior of momentum distribution, we obtain the contact for the unitary Fermi gas. We also compare our results with experimental data and other theoretical predictions.

T-Matrix approach for the Anderson model in the magnetic case

1972 ◽  
Vol 4 (4) ◽  
pp. 110-114
Author(s):  
K. Tankei ◽  
K. Nojima
Keyword(s):  
Anderson Model ◽  
Matrix Approach ◽  
T Matrix ◽  
Magnetic Case
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