Magnetic Vortex Crystals in Frustrated Mott Insulator

  title={Magnetic Vortex Crystals in Frustrated Mott Insulator},
  author={Yoshitomo Kamiya and Cristian D. Batista},
  journal={Physical Review X},
Large-scale ordering of nonelementary mesoscopic magnetic structures is both fundamentally fascinating and technologically relevant. A theoretical study of frustrated quantum magnets predicts the emergence of a new class of stable magnetic vortex crystals under general conditions. 
Magnetic Vortex Induced by Nonmagnetic Impurity in Frustrated Magnets.
It is demonstrated that the ground state includes a magnetic vortex that is nucleated around the impurity over a finite range of magnetic field H_{sat}≦H≤H≥H_{Sat}^{I}, and upon approaching the quantum critical point at H=H=H_{sat], the radius of the magnetic vortex diverges as the magnetic correlation length: ξ∝1/sqrt[H-H_{ sat}].
Néel- and Bloch-Type Magnetic Vortices in Rashba Metals.
This work derives an effective spin model with generalized Ruderman-Kittel-Kasuya-Yosida interactions including the anisotropic and antisymmetric exchange interactions and finds that a vortex crystal of Néel type is stabilized even in the absence of a magnetic field.
Frustration and chiral orderings in correlated electron systems.
It is demonstrated that these basic ingredients lead to exotic phenomena, such as, charge effects in Mott insulators, the stabilization of single magnetic vortices, as well as vortex and skyrmion crystals, and the emergence of different types of chiral liquids.
Tuning of magnetic structures topology via single-ion anisotropy and magnetic field in frustrated 2D semiconductors
The effects of competing magnetic interactions in stabilizing different spin configurations are drawing a renewed attention in order to both unveil emerging topological spin textures and to highlight
Interplay between Single-Ion and Two-Ion Anisotropies in Frustrated 2D Semiconductors and Tuning of Magnetic Structures Topology
This work explores the phase diagram of a frustrated localized magnet characterized by a two-dimensional centrosymmetric triangular lattice and confirms the crucial role of the anisotropic symmetric exchange in systems with dominant short-range interactions and predicts a rich variety of complex magnetic textures.
Spiral spin-liquid and the emergence of a vortex-like state in MnSc2S4
Spirals and helices are common motifs of long-range order in magnetic solids, and they may also be organized into more complex emergent structures such as magnetic skyrmions and vortices. A new type
Topological spin crystals by itinerant frustration
  • S. Hayami, Y. Motome
  • Physics, Medicine
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2021
Focusing on the interplay between charge and spin degrees of freedom in itinerant electron systems, it is shown that itinerant frustration, which is the competition among electron-mediated interactions, plays a central role in stabilizing a variety of topological spin crystals including a skyrmion crystal with unconventional high skyrnion number, meron crystals, and hedgehog crystals.
Spiral spin structures and skyrmionsin multiferroics
Abstract In this article, we focus on (1) type-II multiferroics driven by spiral spin orderings and (2) magnetoelectric couplings in multiferroic skyrmion-hosting materials. We present both
Effective bilinear-biquadratic model for noncoplanar ordering in itinerant magnets
Noncollinear and noncoplanar magnetic textures including Skyrmions and vortices act as emergent electromagnetic fields and give rise to novel electronic and transport properties. We here report a
Face Centered Cubic and Hexagonal Close Packed Skyrmion Crystals in Centrosymmetric Magnets.
Unbiased Monte Carlo simulations and simple stabilization arguments reveal face centered cubic and hexagonal close packed Skyrmion crystals for different choices of the interlayer exchange, indicating that they behave as effective mesoscale particles.


Multiferroic behavior in trimerized Mott insulators.
It is demonstrated that ferroelectric states coexist with ferro- or antiferromagnetic orderings depending on the value of the magnetic field H and the sign of the interlayer exchange J''.
Bose–Einstein condensation in magnetic insulators
A collection of bosonic particles, such as liquid helium or ultracold gases, can condense into a ground state in which the atoms flow as a ‘superfluid’ without scattering. Magnetic materials further
Skyrmion Lattice in a Chiral Magnet
This study experimentally establishes magnetic materials lacking inversion symmetry as an arena for new forms of crystalline order composed of topologically stable spin states in the chiral itinerant-electron magnet MnSi.
Multiferroics: a magnetic twist for ferroelectricity.
It is found that even a weak magnetoelectric interaction can lead to spectacular cross-coupling effects when it induces electric polarization in a magnetically ordered state.
Observation of magnetic excitations of Skyrmion crystal in a helimagnetic insulator Cu2OSeO3.
Two elementary excitations of the Skyrmion with different polarization characteristics are observed: the counterclockwise circulating mode at 1 GHz with the magnetic field polarization parallel to the Sk Kyrmion plane and the breathing mode at1.5 GHz with a perpendicular magneticField polarization.
$Z_2$-vortex lattice in the ground state of the triangular Kitaev-Heisenberg model
Investigating the classical Kitaev-Heisenberg Hamiltonian on a triangular lattice, we establish the presence of an incommensurate non-coplanar magnetic phase, which is identified as a lattice of Z2
Real-space observation of a two-dimensional skyrmion crystal
Real-space imaging of a two-dimensional skyrmion lattice in a thin film of Fe0.5Co 0.5Si using Lorentz transmission electron microscopy reveals a controlled nanometre-scale spin topology, which may be useful in observing unconventional magneto-transport effects.
Singlet-triplet dispersion reveals additional frustration in the triangular-lattice dimer compound Ba3Mn2O8.
Single crystal inelastic neutron scattering measurements of the S=1 dimerized quasi-two-dimensional antiferromagnet Ba(3)Mn(2)O(8) are presented and the obtained exchange values are able to reproduce the four critical fields in the phase diagram.
Anisotropic phase diagram of the frustrated spin dimer compound Ba 3 Mn 2 O 8
Heat capacity and magnetic torque measurements are used to probe the anisotropic temperature-field phase diagram of the frustrated spin dimer compound Ba3Mn2O8 in the field range from 0T to 18T. For
Ordered magnetic phases of the frustrated spin-dimer compoundBa3Mn2O8
Ba3Mn2O8 is a spin-dimer compound based on pairs of S=1, 3d^2, Mn^{5+} ions arranged on a triangular lattice. Antiferromagnetic intradimer exchange leads to a singlet ground state in zero-field. Here