Raman Scattering Signatures of Kitaev Spin Liquids in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>A</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>IrO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>Iridates with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mi>Na</mml:mi></mml:mrow></mml:math>or Li

Knolle, Johannes; Chern, Gia Wei; Kovrizhin, D. L.; Moessner, Roderich; Perkins, Natalia B.

doi:10.1103/physrevlett.113.187201

Cited by 173 publications

(211 citation statements)

References 46 publications

(104 reference statements)

Supporting

Mentioning

198

Contrasting

Order By: Relevance

“…These phases feature exotic low-energy excitations including chargeless spinons emergent from spin fractionalization. The exactly solvable Kitaev model on the honeycomb lattice is a particularly appealing system as it harbors topological spin liquids and fractional quasiparticles, composed of itinerant Majorana fermion and localized flux [2][3][4][5] . Jackeli and Khaliullin 6 have provided the material requirements for realizing Kitaev interactions: strong spinorbit coupled Mott insulators with an edge-sharing octahedral environment where partially filled t 2g orbitals are coupled via two 90…”

Section: Introductionmentioning

confidence: 99%

Relation between Kitaev magnetism and structure in α−RuCl3

et al. 2017

View full text Add to dashboard Cite

Raman scattering has been employed to investigate lattice and magnetic excitations of the honeycomb Kitaev material α-RuCl3 and its Heisenberg counterpart CrCl3. Our phonon Raman spectra give evidence for a first-order structural transition from a monoclinic to a rhombohedral structure for both compounds. Significantly, only α-RuCl3 features a large thermal hysteresis, consistent with the formation of a wide phase of coexistence. In the related temperature interval of 70 − 170 K, we observe a hysteretic behavior of magnetic excitations as well. The stronger magnetic response in the rhombohedral compared to the monoclinic phase evidences a coupling between the crystallographic structure and low-energy magnetic response. Our results demonstrate that the Kitaev magnetism concomitant with fractionalized excitations is susceptible to small variations of bonding geometry.

show abstract

Section: Introductionmentioning

confidence: 99%

Relation between Kitaev magnetism and structure in α−RuCl3

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The superexchange interaction on the square lattices in A 2 IrO 3 compounds (A = Na, Ba) with corner-sharing oxygen octahedra is predominantly of the isotropic Heisenberg type J, while for the honeycomb lattices in A 2 IrO 3 compounds (A = Li, Na) with edge-sharing oxygen octahedra the anisotropic Kitaev interaction K dominates. The exact solution of * E-mail: plakida@theor.jinr.ru the Kitaev model [5] reveals a highly frustrated quantum spin-liquid phase with peculiar dynamics [6][7][8]. The inclusion of a finite isotropic Heisenberg interaction J lifts the degeneracy of the ground state, and a rich phase diagram with competing long-range orders, such as the ferromagnetic (FM), antiferromagnetic (AF), stripe and zigzag phases, emerges [9,10].…”

Section: Introductionmentioning

confidence: 99%

Magnetic order and spin excitations in the Kitaev–Heisenberg model on a honeycomb lattice

Vladimirov

Ihle

Плакида

2016

J. Exp. Theor. Phys.

View full text Add to dashboard Cite

We consider the quasi-two-dimensional pseudo-spin-1/2 Kitaev -Heisenberg model proposed for A2IrO3 (A=Li, Na) compounds. The spin-wave excitation spectrum, the sublattice magnetization, and the transition temperatures are calculated in the random phase approximation (RPA) for four different ordered phases, observed in the parameter space of the model: antiferomagnetic, stripe, ferromagnetic, and zigzag phases. The Néel temperature and temperature dependence of the sublattice magnetization are compared with the experimental data on Na2IrO3.

show abstract

“…The dynamical response functions of the pure Kitaev model are known exactly and reveal characteristic features 6,7 , such as a spectral gap due to a spin flip not only creating gapless Majorana but also gapped flux excitations. This feature is perturbatively stable to small J 8 , but the influence of J on high-energy features (or non-perturbatively at low energies) is unclear and of ongoing interest 9 .…”

mentioning

confidence: 99%

Dynamics of the Kitaev-Heisenberg Model

Gohlke¹,

Verresen²,

Moessner³

et al. 2017

Phys. Rev. Lett.

129

View full text Add to dashboard Cite

We introduce a matrix-product state based method to efficiently obtain dynamical response functions for two-dimensional microscopic Hamiltonians, which we apply to different phases of the Kitaev-Heisenberg model. We find significant broad high energy features beyond spin-wave theory even in the ordered phases proximate to spin liquids. This includes the phase with zig-zag order of the type observed in α-RuCl3, where we find high energy features like those seen in inelastic neutron scattering experiments. Our results provide an example of a natural path for proximate spin liquid features to arise at high energies above a conventionally ordered state, as the diffuse remnants of spin-wave bands intersect to yield a broad peak at the Brillouin zone center.Introduction. The interplay of strong interactions and quantum fluctuations in spin systems can give rise to new and exciting physics. A prominent example are quantum spin liquids (QSL), as fascinating as they are hard to detect: they lack local order parameters and are instead characterized in terms of emergent gauge fields. On the experimental side, spectroscopic measurements provide particularly useful insights into such systems, in particular by probing the fractionalised excitations (e.g. deconfined spinons) accompanying the gauge field. Such measurements can be related to dynamical response functions, e.g. inelastic neutron scattering to the dynamical structure factor. On the theoretical side, determining the ground state properties of such quantum spin models is already a hard problem, and it is even more challenging to understand the dynamics of local excitations.Here we present a combination of the density-matrix renormalization (DMRG) ground state method and a matrix-product states (MPS) based dynamical algorithm to obtain the response functions for generic twodimensional spin systems. With this we are able to access the dynamics of exotic phases that can occur in frustrated systems. Moreover it is also very useful for regular ordered phases where one would conventionally use large-S approximations, which in some cases cannot qualitatively explain certain high energy features 1,2 . We demonstrate our method by applying it to the currently much-studied Kitaev-Heisenberg model (KHM) model on the honeycomb lattice

show abstract

Raman Scattering Signatures of Kitaev Spin Liquids inA2IrO3Iridates withA=Naor Li

Cited by 173 publications

References 46 publications

Relation between Kitaev magnetism and structure in α−RuCl3

Relation between Kitaev magnetism and structure in α−RuCl3

Magnetic order and spin excitations in the Kitaev–Heisenberg model on a honeycomb lattice

Dynamics of the Kitaev-Heisenberg Model

Contact Info

Product

Resources

About