Spin-imbalanced fermion on a dynamic lattice

• URL: http://arxiv.org/abs/2606.25411v1
• Date: Wed, 24 Jun 2026 05:16:37 GMT
• Title: Spin-imbalanced fermion on a dynamic lattice
• Abstract summary: We investigate the magnetic order of a one-dimensional spin-1/2 fermion dynamical lattice.<n> itinerant fermions are coupled to bond-centered localized spins via an Ising-like spin dependent hopping.<n>The two spin-density wave phases are robust against the repulsive Hubbard interaction between itinerant fermions.
• Score: 3.95408087777547
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: We investigate the magnetic order of a one-dimensional spin-1/2 fermion dynamical lattice, where itinerant fermions are coupled to bond-centered localized spins via an Ising-like spin dependent hopping. The model provides an anisotropic dynamical extension of conventional spin-1/2 fermion systems, in which the motion of itinerant fermions is directly modulated by the configuration of localized spins. Using density matrix renormalization group simulations, we map out the ground state phase diagram in various parameter spaces. Depending on the interplay among the hopping dependent on localized spins, the longitudinal field, and the external Zeeman field, two distinct phases are obtained: a paramagnetic phase and a spin-density-wave phase. Most notably, in the partially spin-polarized fermion phase, the spin-density wave ordering wave vector exhibits two distinct phenomena, corresponding respectively to the nesting vectors $2k_{F\uparrow}$ and $2k_{F\downarrow}$ of the spin-resolved Fermi surfaces. We further demonstrate that the two spin-density wave phases are robust against the repulsive Hubbard interaction between itinerant fermions. Our results reveal a novel route for tuning magnetic modulations in one-dimensional correlated systems and enrich the microscopic understanding of dynamical lattice magnetism.

Related papers

• Fringe field induced spin-OAM mixing of twisted electrons [0.0]
  We study spin effects in twisted-electron propagation through the entrance or exit region of an axially symmetric magnetic coil.<n>We derive a paraxial spinor equation in which the longitudinally varying solenoidal field produces, in addition to the usual diagonal Zeeman term, a transverse Pauli coupling proportional to the fringe-field gradient.<n>We derive the corresponding transition amplitudes and show how their phases are governed jointly by the Ermakov accumulation and the diagonal spin-orbital rotation.
  arXiv  Detail & Related papers  (2026-07-03T06:36:16Z)
• Static and Dynamical Characterization of Ground State Phases Induced by Frustration and Magnetic Field in the Spin-1 Orthogonal Dimer Chain [0.0]
  Investigation of S=1 Heisenberg spins using Density Matrix Renormalization Group (DMRG) algorithm.<n>A rich ground state phase diagram is obtained in the parameter space spanned by the ratio of inter- to intra-dimer interaction and an external magnetic field.<n>Results provide crucial insight into the emergence of complex ground state phases from the interplay between strong geometric interactions, frustration, and external magnetic field for interacting S=1 Heisenberg spins.
  arXiv  Detail & Related papers  (2025-07-29T12:55:55Z)
• Emergent quantum Majorana metal from a chiral spin liquid [50.56734933757366]
  We propose a mechanism to explain the emergence of an intermediate gapless spin liquid phase in the antiferromagnetic Kitaev model.<n>We show that the Majorana spectral function captures the dynamical spin and dimer correlations obtained by the infinite Projectedangled Pair States method.
  arXiv  Detail & Related papers  (2024-05-20T18:00:01Z)
• Steering spin fluctuations in lattice systems via two-tone Floquet engineering [1.2289361708127877]
  We consider a one-dimensional spin-1/2 lattice with periodically modulated spin exchanges using parametric resonances.<n>The stroboscopic dynamics generated from distributed spin exchange modulations lead to spin pair fluctuations reaching quasi-maximally correlated states.<n>We present a protocol to control the interacting many-body dynamics, producing spatial and temporal localization of correlated spin pairs.
  arXiv  Detail & Related papers  (2024-01-08T13:42:55Z)
• Quantum Phase Transitions in a Generalized Dicke Model [2.723809629055624]
  We investigate a generalized Dicke model by introducing two interacting spin ensembles coupled with a single-mode bosonic field. Ferromagnetic spin-spin interaction can significantly reduce the required spin-boson coupling strength to observe the superradiant phase. To examine higher-order quantum effects beyond the mean-field contribution, we utilize the Holstein-Primakoff transformation.
  arXiv  Detail & Related papers  (2023-10-29T11:00:56Z)
• Momentum-selective pair creation of spin excitations in dipolar bilayers [0.0]
  We study the temporal growth and spatial propagation of quantum correlations in a two-dimensional bilayer realising a spin-1/2 quantum XXZ model with couplings mediated by long-range and anisotropic dipolar interactions. The predicted behavior remains observable at very low filling fractions, making it accessible in state-of-the-art experiments with Rydberg atoms, magnetic atoms, and polar molecule arrays.
  arXiv  Detail & Related papers  (2023-02-17T18:50:13Z)
• Probing dynamics of a two-dimensional dipolar spin ensemble using single qubit sensor [62.997667081978825]
  We experimentally investigate individual spin dynamics in a two-dimensional ensemble of electron spins on the surface of a diamond crystal. We show that this anomalously slow relaxation rate is due to the presence of strong dynamical disorder. Our work paves the way towards microscopic study and control of quantum thermalization in strongly interacting disordered spin ensembles.
  arXiv  Detail & Related papers  (2022-07-21T18:00:17Z)
• Spin-spin coupling-based quantum and classical phase transitions in two-impurity spin-boson models [55.41644538483948]
  Two-interacting-impurity spin-boson models with vanishing transverse fields on the spin-pair are studied. The dynamics of the magnetization is analysed for different levels of (an)isotropy.
  arXiv  Detail & Related papers  (2022-05-19T08:01:03Z)
• Topological transitions with continuously monitored free fermions [68.8204255655161]
  We show the presence of a topological phase transition that is of a different universality class than that observed in stroboscopic projective circuits. We find that this entanglement transition is well identified by a combination of the bipartite entanglement entropy and the topological entanglement entropy.
  arXiv  Detail & Related papers  (2021-12-17T22:01:54Z)
• Phase diagram of a distorted kagome antiferromagnet and application to Y-kapellasite [50.591267188664666]
  We reveal a rich ground state phase diagram even at the classical level. The presented model opens a new direction in the study of kagome antiferromagnets.
  arXiv  Detail & Related papers  (2021-07-28T18:00:03Z)
• Superradiant phase transition in complex networks [62.997667081978825]
  We consider a superradiant phase transition problem for the Dicke-Ising model. We examine regular, random, and scale-free network structures.
  arXiv  Detail & Related papers  (2020-12-05T17:40:53Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.