From Cooper Pairs to Composite Bosons: A Generalized RPA Analysis of Collective Excitations
Lotfi Belkhir, Mohit Randeria
TL;DR
This paper investigates how the ground state and excitation spectrum of the attractive Hubbard model change from weak to strong attraction, highlighting the transition from Cooper pairs to composite bosons.
Contribution
It provides a generalized RPA analysis of collective excitations across the crossover from Cooper pairs to composite bosons in 2D and 3D Hubbard models.
Findings
Identification of the evolution of excitation spectra across the crossover
Characterization of collective modes in different interaction regimes
Insights into the ground state transformation from weak to strong coupling
Abstract
The evolution of the ground state and the excitation spectrum of the two and three dimensional attractive Hubbard model is studied as the system evolves from a Cooper pair regime for weak attraction to a composite boson regime for a strong attraction.
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