Strong tuning of magnetism and electronic structure by spin orientation

Weng, Yakui; Li, Xing’ao; Dong, Shuai

doi:10.1103/physrevb.102.180401

Cited by 9 publications

(9 citation statements)

References 44 publications

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“…Previously, some of A 2 M Cl 6 (e.g., A 2 TaCl 6 , K 2 NbCl 6 ) were claimed to host the J eff = 3/2 state [19,20], while Rb 2 NbCl 6 was found to be close to the S = 1/2 state [20]. These puzzling contradictions can be well answered in our DFT calculations [28], as summarized in Figs.…”

Section: B Materialssupporting

confidence: 51%

“…For the positive Q 3 case (ω > 0), the occupied state is always Φ 1 or Φ 2 , which will be split by Hubbard repulsion. The most interesting physical property of Φ 1 (or Φ 2 ) is that its spin magnetic moment (1 µ B ) just cancels the orbital magnetic moment (−1 µ B ), leading to a zero net magnetization [19]. In the opposite direction, i.e., ω < 0, Φ 3 (or Φ 4 ) becomes the low-lying level.…”

Section: A Atomic Orbital Modelmentioning

confidence: 99%

“…The spin and orbital magnetic moments obtained in our DFT calculation are close to their ideal limits (see Table I). The band gap can only be opened with the help of SOC, implying the SOC-assisted Mottness [19].…”

Section: B Materialsmentioning

confidence: 99%

“…In the past decade, the spin-orbit coupling (SOC) has attracted more and more attentions in many branches of condensed matter. In particular, for those heavy transition metal elements with 4d or 5d orbitals, the synactic effect of SOC and electron correlation can lead to emergent quantum phenomena such as topological phase [8][9][10], unconventional superconductivity [11][12][13][14], Kitaev spin liquid [15,16], large anisotropic magnetoresistivity [17,18], as well as magnetic quadrupole moments [19,20]. These SOC-entangled quantum states should be highly sensitive to external stimulations, which provides the opportunities to manipulate them.…”

Section: Introductionmentioning

confidence: 99%

“…Our recent theoretical work predicted that the 4d 1 electron in K 2 NbCl 6 is in the J eff = 3/2 state, which could be tuned to the S = 1/2 state by rotating the spin axis [19]. A key characteristic of the ideal J eff = 3/2 state is that its spin magnetic moment and orbital magnetic moment should cancel each other, leading to a quenched net magnetic dipole moment (i.e., ideally 0 µ B /Nb).…”

Section: Introductionmentioning

confidence: 99%

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Manipulation of Jeff=3/2 states by tuning the tetragonal distortion

Weng,

Dong

2021

Preprint

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Section: B Materialssupporting

confidence: 51%

Section: A Atomic Orbital Modelmentioning

confidence: 99%

Section: B Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Manipulation of Jeff=3/2 states by tuning the tetragonal distortion

Weng,

Dong

2021

Preprint

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Strain tuned magnetotransport of Jeff=1/2 antiferromagnetic Sr2IrO4 thin films

Weng

Chen

et al. 2022

Materials Today Physics

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Multiflavor Mott insulators in quantum materials and ultracold atoms

Chen,

2024

npj Quantum Mater.

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Mott insulators with large and active (or multiflavor) local Hilbert spaces widely occur in quantum materials and ultracold atomic systems, and are dubbed “multiflavor Mott insulators”. For these multiflavor Mott insulators, the spin-only description with the quadratic spin interactions is often insufficient to capture the major physical processes. In the situation with active orbitals, the Kugel-Khomskii superexchange model was then proposed. We briefly review this historical model and discuss the modern developments beyond the original spin-orbital context. These include and are not restricted to the 4d/5d transition metal compounds with the spin-orbit-entangled J = 3/2 quadruplets, the rare-earth magnets with two weakly-separated crystal field doublets, breathing magnets and/or the cluster and molecular magnets, et al. We explain the microscopic origin of the emergent Kugel-Khomskii physics in each realization with some emphasis on the J = 3/2 quadruplets, and refer the candidate multiflavor Mott insulators as “J = 3/2 Mott insulators”. For the ultracold atoms, we review the multiflavor Mott insulator realization with the ultracold alkaline and alkaline-earth atoms on the optical lattices. Despite a large local Hilbert space from the atomic hyperfine spin states, the system could naturally realize a large symmetry group such as the Sp(N) and SU(N) symmetries. These ultracold atomic systems lie in the large-N regime of these symmetry groups and are characterized by strong quantum fluctuations. The Kugel-Khomskii physics and the exotic quantum ground states with the “baryon-like” physics can appear in various limits. We conclude with our vision and outlook on this subject.

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Strong tuning of magnetism and electronic structure by spin orientation

Cited by 9 publications

References 44 publications

Manipulation of Jeff=3/2 states by tuning the tetragonal distortion

Manipulation of Jeff=3/2 states by tuning the tetragonal distortion

Strain tuned magnetotransport of Jeff=1/2 antiferromagnetic Sr2IrO4 thin films

Multiflavor Mott insulators in quantum materials and ultracold atoms

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