Spin and charge dynamics of a quasi-one-dimensional antiferromagnetic metal

Abstract

We use quantum Monte Carlo simulations to study a finite-temperature dimensional-crossover-driven evolution of spin and charge dynamics in weakly coupled Hubbard chains with a half-filled band. The low-temperature behavior of the charge gap indicates a crossover between two distinct energy scales: a high-energy one-dimensional (1D) Mott gap due to the umklapp process and a low-energy gap which stems from long-range antiferromagnetic (AF) fluctuations. Away from the 1D regime and at temperature scales above the charge gap, the emergence of a zero-frequency Drude-like feature in the interchain optical conductivity ${\sigma }_{\perp }(\omega )$ implies the onset of a higher-dimensional metal. In this metallic phase, enhanced quasiparticle scattering off finite-range AF fluctuations results in incoherent single-particle dynamics. The coupling between spin and charge fluctuations is also seen in the spin dynamical structure factor $S(q,\omega )$ displaying damped spin excitations (paramagnons) close to the AF wave-vector $q=(\pi ,\pi )$ and particle-hole continua near 1D momentum transfers spanning quasiparticles at the Fermi surface. We relate our results to the charge deconfinement in quasi-1D organic Bechgaard-Fabre salts.

14+ pages, 13 figures; new Fig. 5c, added Fig. 6

References in corpus (20)

• Many-Body Physics with Ultracold Gases
• Electrodynamics of Correlated Electron Materials
• Lattice symmetry breaking in cuprate superconductors: Stripes, nematics, and superconductivity
• Evolution of electronic structure of doped Mott insulators - reconstruction of poles and zeros of Green's function
• Spectral functions in one-dimensional quantum systems at T>0
• Anomalous Transport Phenomena in Fermi Liquids with Strong Magnetic Fluctuations
• Mott Transition in the Two-Dimensional Hubbard Model
• Cellular Dynamical Mean Field Theory for the 1D Extended Hubbard Model
• Intermediate Coupling Model of the Cuprates
• Breakup of the Fermi surface near the Mott transition in low-dimensional systems
• Momentum-dependent pseudogaps in the half-filled two-dimensional Hubbard model
• Optical conductivity in cluster dynamical mean field theory: formalism and application to high temperature superconductors
• Pseudogap in underdoped cuprates and spin-density-wave fluctuations
• Spin and charge dynamics of the one-dimensional extended Hubbard model
• Spectral properties near the Mott transition in the two-dimensional Hubbard model with next-nearest-neighbor hopping
• Electronic properties of Fabre charge-transfer salts under various temperature and pressure conditions
• Exact diagonalization study of optical conductivity in two-dimensional Hubbard model
• Dimensional-crossover-driven Mott transition in the frustrated Hubbard model
• Interaction-induced Fermi surface deformations in quasi one-dimensional electronic systems
• Finite energy spectral function of an anisotropic 2D system of coupled Hubbard chains

Cited by in corpus (5)

• Numerically exploring the 1D-2D dimensional crossover on spin dynamics in the doped Hubbard model
• Magnetic phases of the anisotropic triangular lattice Hubbard model
• One-particle spectral functions of the one-dimensional Fermionic Hubbard model with one fermion per site at zero and finite magnetic fields
• Local moments versus itinerant antiferromagnetism: magnetic phase diagram and spectral properties of the anisotropic square lattice Hubbard model
• Bethe strings in the spin dynamical structure factor of the Mott-Hubbard phase in one-dimensional fermionic Hubbard model