Single‐particle density matrix method for the solution of the many‐electron problem

1989 ◽  
Vol 91 (9) ◽  
pp. 5492-5499 ◽  
Author(s):  
Antonio Redondo ◽  
Jean C. Marshall
Keyword(s):  
Density Matrix ◽  
Single Particle ◽  
Matrix Method ◽  
Particle Density ◽  
Single Particle Density ◽  
The Many

scholarly journals Hidden Pseudogap and Excitation Spectra in a Strongly Coupled Two-Band Superfluid/Superconductor

2021 ◽  
Vol 6 (1) ◽  
pp. 8
Author(s):  
Hiroyuki Tajima ◽  
Pierbiagio Pieri ◽  
Andrea Perali
Keyword(s):  
Single Particle ◽  
Particle Density ◽  
Scanning Tunneling ◽  
Einstein Condensation ◽  
Tunneling Microscopy ◽  
Excitation Spectra ◽  
Strongly Coupled ◽  
Single Particle Density ◽  
The Many ◽  
Bose Einstein

We investigate single-particle excitation properties in the normal state of a two-band superconductor or superfluid throughout the Bardeen–Cooper–Schrieffer (BCS) to Bose–Einstein-condensation (BEC) crossover, within the many-body T-matrix approximation for multichannel pairing fluctuations. We address the single-particle density of states and the spectral functions consisting of two contributions associated with a weakly interacting deep band and a strongly interacting shallow band, relevant for iron-based multiband superconductors and multicomponent fermionic superfluids. We show how the pseudogap state in the shallow band is hidden by the deep band contribution throughout the two-band BCS-BEC crossover. Our results could explain the missing pseudogap in recent scanning tunneling microscopy experiments in FeSe superconductors.

scholarly journals Measuring an interaction-induced topological phase transition via the single-particle density matrix

2020 ◽  
Vol 101 (1) ◽  
Author(s):  
Jun-Hui Zheng ◽  
Bernhard Irsigler ◽  
Lijia Jiang ◽  
Christof Weitenberg ◽  
Walter Hofstetter
Keyword(s):  
Phase Transition ◽  
Density Matrix ◽  
Single Particle ◽  
Particle Density ◽  
Topological Phase ◽  
Single Particle Density ◽  
Topological Phase Transition

Nuclear potential energy and the single-particle density matrix

1964 ◽  
Vol 60 (4) ◽  
pp. 634-640 ◽  
Author(s):  
Kailash Kumar ◽  
K.J. Le Couteur ◽  
M.K. Roy
Keyword(s):  
Potential Energy ◽  
Density Matrix ◽  
Single Particle ◽  
Particle Density ◽  
Nuclear Potential ◽  
Single Particle Density
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