Intermediate Quantum Spin Liquid Phase in the Kitaev Material $α$-RuCl$_3$ under High Magnetic Fields up to 100 T

Zhou, Xu-Guang; Li, Han; Matsuda, Yasuhiro H.; Matsuo, Akira; Li, Wei; Kurita, Nobuyuki; Kindo, Koichi; Tanaka, Hidekazu

doi:10.48550/arxiv.2201.04597

Cited by 2 publications

(2 citation statements)

References 37 publications

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“…Notably, in the presence of an applied field, Kitaev models lead to a phase diagram not only depending on field strength but also on field direction, with a resulting proliferation of competing phases. Of particular interest are field-induced spin liquid phases, where intriguing results been suggested in recent experiments on the S= 1 2 material α-RuCl 3 when an in-plane field [10][11][12][13][14] or out-of-plane field [15] is applied. In theoretical studies of S= 1 2 antiferromagnetic (AFM) Kitaev honeycomb models, signatures of possible spin liquid phases under a magnetic field have also been reported.…”

Section: Introductionmentioning

confidence: 99%

Islands of Chiral Solitons in Integer Spin Kitaev Chains

Sørensen¹,

Riddell²

2023

Preprint

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An intriguing chiral soliton phase has recently been identified in the S= 1 2 Kitaev spin chain. Here we show that for S=1,2,3,4,5 an analogous phase can be identified, but contrary to the S= 1 2 case the chiral soliton phases appear as islands within the sea of the polarized phase. In fact, a small field applied in a general direction will adiabatically connect the integer spin Kitaev chain to the polarized phase. Only at sizable intermediate fields along symmetry directions does the soliton phase appear centered around the special point h x =h y =S where two exact product ground-states can be identified. The large S limit can be understood from a semi-classical analysis, and variational calculations provide a detailed picture of the S=1 soliton phase. Under open boundary conditions, the chain has a single soliton in the ground-state which can be excited, leading to a proliferation of in-gap states. In contrast, even length periodic chains exhibit a gap above a twice degenerate ground-state. The presence of solitons leaves a distinct imprint on the low temperature specific heat.

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Section: Introductionmentioning

confidence: 99%

Islands of Chiral Solitons in Integer Spin Kitaev Chains

Sørensen¹,

Riddell²

2023

Preprint

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“…The Kitaev model is an exactly solvable [1] quantum spin model with fractionalized excitations within the family of spin-liquid models. Candidate materials for its J ef f = 1/2 ferromagnetic (F) realization are the iridates X 2 IrO 3 (X: Li [2,3], Na [4][5][6][7][8][9]) and α-RuCl 3 [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Recently, there is a growing interest in the search of additional materials [25][26][27] with perhaps antiferromagnetic (AF) Kitaev type couplings such as Na 3 Co 2 SbO 6 -Na 2 Co 2 TeO 6 [28] and the f-electron based rare-earth oxides [29].…”

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confidence: 99%

Phase Diagrams of Kitaev Models for Arbitrary Magnetic-Field Orientations

Yılmaz¹,

Kampf²,

Yip³

2022

Preprint

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The Kitaev model is an exactly solvable quantum spin model within the language of the constrained real fermions. In spite of numerous studies along special magnetic-field orientations, there is a limited amount of knowledge on the complete field-angle characterization, which can provide valuable information on the existence of fractionalized excitations. For this purpose, we first extend previous studies on the field-angle response of the ferromagnetic Kitaev model to its antiferromagnetic version. Yet, the realistic description of the candidate Kitaev materials, within the edge-sharing octahedra paradigm, require additional coupling terms, including a large off-diagonal term Γ along with possible anisotropic corrections Γp. It is therefore not sufficient to depend on the topological properties of the bare Kitaev model as the only source for the observed thermal Hall conductivity signals and an understanding of these extended Kitaev models with a complete field response is demanded. Starting from the zero-field phase diagram of realistic K-Γ-Γp models, we identify antiferromagnetic zig-zag and (partially) polarized phases as well as two unusual Kitaev(-Γ) spin-liquid phases. The magnetic field response of these phases for arbitrary field orientations provides a remarkably rich phase diagram. A partially polarized phase is revealed between two ordered phases with a suppressed magnetization, finite fractionalization and finite Chern number. This phase is characterized as an extended Kitaev-Γ spin-liquid. To comply our findings with experiments, we reproduce the asymmetry in the extent of the intermediate phases specifically for the two different field directions θ = ±60 o .

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Intermediate Quantum Spin Liquid Phase in the Kitaev Material $α$-RuCl$_3$ under High Magnetic Fields up to 100 T

Cited by 2 publications

References 37 publications

Islands of Chiral Solitons in Integer Spin Kitaev Chains

Islands of Chiral Solitons in Integer Spin Kitaev Chains

Phase Diagrams of Kitaev Models for Arbitrary Magnetic-Field Orientations

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