Gapless quantum spin liquid in a honeycomb Γ magnet

Abstract A family of spin–orbit coupled honeycomb Mott insulators offers a playground to search for quantum spin liquids (QSLs) via bond-dependent interactions. In candidate materials, a symmetric off-diagonal Γ term, close cousin of Kitaev interaction, has emerged as another source of frustration t...

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Autores principales:	Qiang Luo, Jize Zhao, Hae-Young Kee, Xiaoqun Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/87690ae5f5a84227a39869632eefb91c
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spelling	oai:doaj.org-article:87690ae5f5a84227a39869632eefb91c2021-12-02T15:56:48ZGapless quantum spin liquid in a honeycomb Γ magnet10.1038/s41535-021-00356-z2397-4648https://doaj.org/article/87690ae5f5a84227a39869632eefb91c2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00356-zhttps://doaj.org/toc/2397-4648Abstract A family of spin–orbit coupled honeycomb Mott insulators offers a playground to search for quantum spin liquids (QSLs) via bond-dependent interactions. In candidate materials, a symmetric off-diagonal Γ term, close cousin of Kitaev interaction, has emerged as another source of frustration that is essential for complete understanding of these systems. However, the ground state of honeycomb Γ model remains elusive, with a suggested zigzag magnetic order. Here we attempt to resolve the puzzle by perturbing the Γ region with a staggered Heisenberg interaction which favours the zigzag ordering. Despite such favour, we find a wide disordered region inclusive of the Γ limit in the phase diagram. Further, this phase exhibits a vanishing energy gap, a collapse of excitation spectrum, and a logarithmic entanglement entropy scaling on long cylinders, indicating a gapless QSL. Other quantities such as plaquette-plaquette correlation are also discussed.Qiang LuoJize ZhaoHae-Young KeeXiaoqun WangNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Qiang Luo Jize Zhao Hae-Young Kee Xiaoqun Wang Gapless quantum spin liquid in a honeycomb Γ magnet
description	Abstract A family of spin–orbit coupled honeycomb Mott insulators offers a playground to search for quantum spin liquids (QSLs) via bond-dependent interactions. In candidate materials, a symmetric off-diagonal Γ term, close cousin of Kitaev interaction, has emerged as another source of frustration that is essential for complete understanding of these systems. However, the ground state of honeycomb Γ model remains elusive, with a suggested zigzag magnetic order. Here we attempt to resolve the puzzle by perturbing the Γ region with a staggered Heisenberg interaction which favours the zigzag ordering. Despite such favour, we find a wide disordered region inclusive of the Γ limit in the phase diagram. Further, this phase exhibits a vanishing energy gap, a collapse of excitation spectrum, and a logarithmic entanglement entropy scaling on long cylinders, indicating a gapless QSL. Other quantities such as plaquette-plaquette correlation are also discussed.
format	article
author	Qiang Luo Jize Zhao Hae-Young Kee Xiaoqun Wang
author_facet	Qiang Luo Jize Zhao Hae-Young Kee Xiaoqun Wang
author_sort	Qiang Luo
title	Gapless quantum spin liquid in a honeycomb Γ magnet
title_short	Gapless quantum spin liquid in a honeycomb Γ magnet
title_full	Gapless quantum spin liquid in a honeycomb Γ magnet
title_fullStr	Gapless quantum spin liquid in a honeycomb Γ magnet
title_full_unstemmed	Gapless quantum spin liquid in a honeycomb Γ magnet
title_sort	gapless quantum spin liquid in a honeycomb γ magnet
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/87690ae5f5a84227a39869632eefb91c
work_keys_str_mv	AT qiangluo gaplessquantumspinliquidinahoneycombgmagnet AT jizezhao gaplessquantumspinliquidinahoneycombgmagnet AT haeyoungkee gaplessquantumspinliquidinahoneycombgmagnet AT xiaoqunwang gaplessquantumspinliquidinahoneycombgmagnet
_version_	1718385401512591360

Gapless quantum spin liquid in a honeycomb Γ magnet

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