Scattering phenomena for spin transport in Kitaev spin liquid

Abstract

The Kitaev model exhibits a canonical quantum spin liquid as a ground state and hosts two fractional quasiparticles, itinerant Majorana fermion and localized flux excitation. The former can carry heat and spin modulations in the quantum spin liquid, but the role of the latter remains unknown for the transport phenomena. Here, we focus on spin transport in the presence of excited fluxes and report that they yield strong interference in the propagation of the Majorana fermions, which feel gauge-like potential emergent around the fluxes. We examine the transient spin dynamics triggered by a pulsed magnetic field at an edge. In the absence of excited fluxes, the magnetic-field pulse creates the plane wave of the Majorana fermions, which flows in the quantum spin liquid. Although this wave does not accompany the change of local spin moments in bulk, it induces local moments at the side opposite to the edge under the magnetic-field pulse. We observe the spatial modulation of induced spin moments when fluxes are excited in the bulk region. This behavior is more striking than the case of lattice defects. Moreover, we find that, although the amplitude of the spatial change is almost independent of the distance between lattice defects, it is strongly enhanced by increasing the distance for the case of excited fluxes. The difference is understood from the influence on the itinerant Majorana fermions; the lattice defects change the system locally, but flux excitations alter all the transfer integrals on the string connecting them. The present results will provide another route to observing intrinsic flux excitations distinguished from extrinsic effects such as lattice defects.

15 pages, 10 figures

References in corpus (42)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Dissipationless Quantum Spin Current at Room Temperature
• Spin Seebeck insulator
• $\alpha$-RuCl3: a Spin-Orbit Assisted Mott Insulator on a Honeycomb Lattice
• Theory of magnon-driven spin Seebeck effect
• Models and Materials for Generalized Kitaev Magnetism
• On the Origin of Zigzag Magnetic Order in Iridium Oxide Na2IrO3
• Scattering Continuum and Possible Fractionalized Excitations in $\alpha$-RuCl${}_3$
• Magnetic order in $\alpha$-RuCl${}_3$: a honeycomb lattice quantum magnet with strong spin-orbit coupling
• Topological characterization of quantum phase transitions in a S=1/2 spin model
• Successive magnetic phase transitions in $\mathbf{\alpha }$-RuCl${}_3$: XY-like frustrated magnet on the honeycomb lattice
• Pseudospin exchange interactions in d^7 cobalt compounds: Possible realization of the Kitaev model
• Kitaev-Heisenberg Hamiltonian for High-Spin $d^7$ Mott Insulators
• Exact results on the Kitaev model on a hexagonal lattice: spin states, string and brane correlators, and anyonic excitations
• Vaporization of Kitaev spin liquids
• Magnon Mediated Electric Current Drag Across a Ferromagnetic Insulator Layer
• Spin convertance at magnetic interfaces
• Raman Scattering Signatures of Kitaev Spin Liquids in A${}_2$ IrO${}_3$ Iridates
• Observation of spin current in quantum spin liquid
• Microscopic mechanism for higher-spin Kitaev model
• Magnetic properties of the honeycomb oxide Na${}_2$Co${}_2$TeO${}_6$
• Zigzag antiferromagnetic ground state with anisotropic correlation lengths in the quasi-2D honeycomb lattice compound Na2Co2TeO6
• Weak-field induced nonmagnetic state in a Co-based honeycomb
• The magnetic properties and structure of the quasi-two-dimensional antiferromagnet CoPS${}_3$
• Theory of the field-revealed Kitaev spin liquid
• Disorder in a quantum spin liquid: flux binding and local moment formation
• Majorana Fermions, Exact Mappings between Classical and Topological Orders
• Kitaev Materials
• Magnetic order in single crystals of Na3Co2SbO6 with a honeycomb arrangement of 3d${}^7$ Co${}^{2+}$ ions
• Sign structure of thermal Hall conductivity for in-plane-field polarized Kitaev magnets
• Tunneling spectroscopy of quantum spin liquids
• Topological magnons for thermal Hall transport in frustrated magnets with bond-dependent interactions
• STM as a single Majorana detector of Kitaev's chiral spin liquid
• Electrical Access to Ising Anyons in Kitaev Spin Liquids
• Field-angle dependence of thermal Hall conductivity in magnetically ordered Kitaev-Heisenberg system
• Majorana correlations in the Kitaev model with ordered-flux structures
• Ultrafast demagnetization in NiCo2O4 thin films probed by time-resolved microscopy
• Thermal interferometry of anyons in spin liquids
• Spin Seebeck Effect in Nonmagnetic Excitonic Insulators
• Dissipationless Spin Current Generation in Kitaev's Chiral Spin Liquid
• Role of Majorana fermions in spin transport of anisotropic Kitaev model
• Thermally enhanced Majorana-mediated spin transport in the Kitaev model

Cited by in corpus (5)

• Non-local spin correlation as a signature of Ising anyons trapped in vacancies of the Kitaev spin liquid
• Field-driven spatiotemporal manipulation of Majorana zero modes in a Kitaev spin liquid
• Real-time control of non-Abelian anyons in Kitaev spin liquid under energy dissipation
• Majorana Gap Formation in the Anisotropic Kitaev Model with Ordered Flux Configuration
• Tunable anyonic permeability across ${\mathbb{Z}}_2$ spin liquid junctions