Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Collective Excitations and Optical Gaps in Strongly Correlated Fermi Systems

Claudio Castellani, Gabriel Kotliar, Roberto Raimondi, M. Grilli, Ziqiang Wang, M. Rosenberg

Published Jan 1, 1992• 0 citations
OpenAlex

Related papers

Quasiparticles and Collective Excitations in Strongly Correlated Fermi Systems

M. Grilli, Roberto Raimondi

•Jan 1, 1992•0 citations

New approaches to the study of collective excitations in strongly-interacting fermi systems

David G. Sandler, N. H. Kwong, W. K. Kellogg +2 more

Lecture notes in physics•Jan 1, 1981•2 citations

Collective excitations, photoemission spectra, and optical gaps in strongly correlated Fermi systems

Claudio Castellani, Gabriel Kotliar, Roberto Raimondi +3 more

We analyze the single-particle and collective excitations near the metal to charge-transfer insulator transition, using the slave-boson technique. We show that the Mott transition can be interpreted as a softening of an auxiliary Bose excitation. In the insulating phase the energy of the boson at zero momentum is related to the jump in the chemical potential at zero doping. The dispersion of the collective modes gives rise to the structure of the incoherent Hubbard bands. A similar picture holds for the single-band Hubbard model.

Physical Review Letters•Sep 28, 1992•49 citations

Ground state structure and excitations in strongly correlated Fermi systems

A. P. Protogenov

Physics Letters A•Mar 1, 1990•1 citation

Collective excitations in fermi systems

Viktor Mikhaĭlovich Galit︠s︡kiĭ

Physica•Dec 1, 1960•3 citations

Universal pairing-gap measurement proposal by dynamical excitations in a two-dimensional doped attractive Fermi-Hubbard model with spin-orbit coupling

Huaisong Zhao, Rui Han, Ling Qin +2 more

By calculating the dynamical structure factor of the two-dimensional doped attractive Fermi-Hubbard model with Rashba spin-orbit coupling (SOC), we not only investigate collective modes and single-particle excitations of the system during the phase transition between the Bardeen-Cooper-Schrieffer superfluid and topological superfluid, but also propose a universal method to measure the pairing gap in an optical lattice system. Our numerical results show that the area of the molecular excitation peak at the transferred momentum $\mathbf{q}=[\ensuremath{\pi},\ensuremath{\pi}]$ is proportional to the square of the pairing gap in the system with Rashba SOC. In particular, this method is very sensitive to the pairing gap. We verify that this method is universal to measure the pairing gap in a doped optical lattice with Rashba SOC. These theoretical results are important for experimentally measuring the pairing gap and studying the topological superfluid in an optical lattice.

arXiv:2401.17488•Physical Review A•Dec 30, 2024•4 citations
We analyze the single-particle and collective excitations near the metal to charge-transfer insulator transition, using the slave-boson technique. We show that the Mott transition can be interpreted as a softening of an auxiliary Bose excitation. In the insulating phase the energy of the boson at zero momentum is related to the jump in the chemical potential at zero doping. The dispersion of the collective modes gives rise to the structure of the incoherent Hubbard bands. A similar picture holds for the single-band Hubbard model.
By calculating the dynamical structure factor of the two-dimensional doped attractive Fermi-Hubbard model with Rashba spin-orbit coupling (SOC), we not only investigate collective modes and single-particle excitations of the system during the phase transition between the Bardeen-Cooper-Schrieffer superfluid and topological superfluid, but also propose a universal method to measure the pairing gap in an optical lattice system. Our numerical results show that the area of the molecular excitation peak at the transferred momentum $\mathbf{q}=[\ensuremath{\pi},\ensuremath{\pi}]$ is proportional to the square of the pairing gap in the system with Rashba SOC. In particular, this method is very sensitive to the pairing gap. We verify that this method is universal to measure the pairing gap in a doped optical lattice with Rashba SOC. These theoretical results are important for experimentally measuring the pairing gap and studying the topological superfluid in an optical lattice.