Probing quasiparticle excitations in a doped Mott insulator via Friedel oscillations

Abstract

In this work, we investigate impurity-induced Friedel oscillations in the doped two-dimensional Hubbard model, focusing on the role of holon and doublon excitations. We show that weak impurities, due to the non-fermionic nature of the underlying quasiparticles, induce Friedel oscillations whose behavior is consistent with an effective non-interacting theory for these quasiparticles, and whose wavevector reflects the violation of Luttinger's theorem. At larger impurity strength, the system transitions to a phase-separated state composed of coexisting Mott-insulating (half-filled) and hole-rich regions. Within the composite operator framework, this phase separation arises from a competition between the kinetic energy of holons and the tendency to form tightly bound holon-doublon pairs. Our results offer new insights into the nature of charge carriers and the emergent electronic phases in the doped Mott regime.

References in corpus (35)

• Imaging Quasiparticle Interference in Bi2Sr2CaCu2O8+d
• The Hubbard Model
• Quasiparticle Scattering Interference in High Temperature Superconductors
• Topological order, emergent gauge fields, and Fermi surface reconstruction
• Variational description of Mott insulators
• Mottness: Identifying the Propagating Charge Modes in doped Mott Insulators
• Phase separation at all interaction strengths in the t-J model
• Finite doping signatures of the Mott transition in the two-dimensional Hubbard model
• Self-energy-functional theory
• Variational cluster approach to the Hubbard model: Phase-separation tendency and finite-size effects
• Separation of Spin and Charge Quantum Numbers in Strongly Correlated Systems
• Phase separation in the Hubbard model
• Wigner crystal vs. Friedel oscillations in the 1D Hubbard model
• Anomalous Spin and Charge Dynamics of the 2D t-J Model at low doping
• Charge Friedel oscillations in a Mott insulator
• Superconductivity-Induced Transfer of In-Plane Spectral Weight in Bi2Sr2CaCu2O8: Resolving a Controversy
• Long Range Coulomb Interactions and Nanoscale Electronic Inhomogeneities in Correlated Oxides
• Fermi-surface reconstruction without symmetry breaking
• Exact Integration of the High Energy Scale in Doped Mott Insulators
• Doping effects in high-harmonic generation from correlated systems
• Spin bags in the doped t-J model
• Holon-Doublon Binding as the Mechanism for the Mott transition
• Edge zeros and boundary spinons in topological Mott insulators
• From immunity to sudden death: Effects of strong disorder in strongly correlated superconductors
• Projective Truncation Approximation for Equations of Motion of Two-Time Green's Functions
• Friedel oscillation in non-Fermi liquid: Lesson from exactly solvable Hatsugai-Kohmoto model
• Charge, bond, and pair density wave orders in a strongly correlated system
• Interplay of spin and charge order in the electron-doped cuprates
• Bands renormalization and superconductivity in the strongly correlated Hubbard model using composite operators method
• Real-space dynamical mean-field theory of Friedel oscillations in strongly correlated electron systems
• Friedel oscillations induced by non-magnetic impurities in the two-dimensional Hubbard model
• Equation of Motion Series Expansion of Double Time Green's Functions
• Spontaneous layer selective Mott phase in the bilayer Hubbard model
• Quasiparticle scattering interference in cuprate superconductors
• Charge density wave solutions of the Hubbard model in the composite operator formalism