Dynamic structure factor of one-dimensional Fermi superfluid with spin-orbit coupling

Abstract

We theoretically calculate the density dynamic structure factor of one-dimensional Fermi superfluid with Raman-type spin-orbit coupling, and analyze its main dynamical character during phase transition between Bardeen-Cooper-Schrieffer superfluid and topological superfluid. Our theoretical results display four kinds of single-particle excitations induced by the two-branch structure of single-particle spectrum, and the cross single-particle excitation is much easier to be seen in the spin dynamic structure factor at a small transferred momentum. Also we find a new roton-like collective mode emerges at a fixed transferred momentum $q\simeq 2k_F$, and it only appears once the system enters the topological superfluid state. The occurrence of this roton-like excitation is related to switch of global minimum in single-particle spectrum from $k=0$ to $k\simeq 2k_F$.

References in corpus (15)

• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
• Amplitude / Higgs Modes in Condensed Matter Physics
• Bragg spectroscopy of a strongly interacting Fermi gas
• Local Density Functional Theory for Superfluid Fermionic Systems: The Unitary Gas
• Goldstone mode and pair-breaking excitations in atomic Fermi superfluids
• Radio-Frequency Transitions on Weakly-Bound Ultracold Molecules
• Majorana fermions in one-dimensional spin-orbit coupled Fermi gases
• Quantitative comparison between theoretical predictions and experimental results for Bragg spectroscopy of a strongly interacting Fermi superfluid
• Collective oscillations of a confined Bose gas at finite temperature in the random-phase approximation
• Soliton-induced Majorana fermions in a one-dimensional atomic topological superfluid
• Impurity probe of topological superfluid in one-dimensional spin-orbit coupled atomic Fermi gases
• Dynamical structure factors of a two-dimensional Fermi superfluid within random phase approximation
• Second sound with ultracold atoms: A brief historical account
• Probing two Higgs oscillations in a one-dimensional Fermi superfluid with Raman-type spin-orbit coupling

Cited by in corpus (5)

• Phase diagram, band structure and density of states in two-dimensional attractive Fermi-Hubbard model with Rashba spin-orbit coupling
• Dynamic structure factor of two-dimensional Fermi superfluid with Rashba spin-orbit coupling
• A universal pairing gap measurement proposal by dynamical excitations in 2D doped attractive Fermi-Hubbard model with spin-orbit coupling
• Dynamical structure factor and a new method to measure the pairing gap in two-dimensional attractive Fermi-Hubbard model
• Novel dynamical excitations and roton-based measurement of Cooper-pair momentum in a two-dimensional Fulde-Ferrell-Larkin-Ovchinnikov superfluid on optical lattices