Single-particle excitation spectrum of the anyon gas

1992 ◽  
Vol 46 (14) ◽  
pp. 9063-9069 ◽  
Author(s):  
A. L. Fetter ◽  
C. B. Hanna
Keyword(s):  
Excitation Spectrum ◽  
Single Particle ◽  
Single Particle Excitation

scholarly journals A Theoretical Approach to Pseudogap and Superconducting Transitions in Hole-Doped Cuprates

2013 ◽  
Vol 2013 ◽  
pp. 1-26
Author(s):  
Partha Goswami
Keyword(s):  
Excitation Spectrum ◽  
Single Particle ◽  
Momentum Space ◽  
Density Wave ◽  
Mean Field ◽  
Spectral Weight ◽  
Square Lattice ◽  
Cooper Pairs ◽  
Single Particle Excitation ◽  
Competing Orders

We consider a two-dimensional fermion system on a square lattice described by a mean-field Hamiltonian involving the singlet id-density wave (DDW) order, assumed to correspond to the pseudo-gap (PG) state, favored by the electronic repulsion and the coexisting -wave superconductivity (DSC) driven by an assumed attractive interaction within the BCS framework. Whereas the single-particle excitation spectrum of the pure DDW state consists of the fermionic particles and holes over the reasonably conducting background, the coexisting states corresponds to Bogoliubov quasi-particles in the background of the delocalized Cooper pairs in the momentum space. We find that the two gaps in the single-particle excitation spectrum corresponding to PG and DSC, respectively, are distinct and do not merge into one “quadrature” gap if the nesting property of the normal state dispersion is absent. We show that the PG and DSC are representing two competing orders as the former brings about a depletion of the spectral weight available for pairing in the anti-nodal region of momentum space where the superconducting gap is supposed to be the largest. This indicates that the PG state perhaps could not be linked to a preformed pairing scenario. We also show the depletion of the spectral weight below at energies larger than the gap amplitude. This is an important hallmark of the strong coupling superconductivity.

Pseudogap Formation in CeNiSn

1998 ◽  
Vol 12 (05) ◽  
pp. 197-204
Author(s):  
Feng Xiao-Bing
Keyword(s):  
Green’S Function ◽  
Temperature Dependence ◽  
Excitation Spectrum ◽  
Green's Function ◽  
Single Particle ◽  
Anderson Model ◽  
Periodic Anderson Model ◽  
Decoupling Method ◽  
Single Particle Excitation

Using Green's function decoupling method the single particle excitation spectrum of the periodic Anderson model is studied. With increasing hybridization potential in the Kondo regime there appear pseudogaps in the excitation spectrum of the two kinds of carriers. The temperature dependence of the pseudogaps is qualitatively in accordance with tunneling experiments on CeNiSn.

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