Doping a spin-orbit Mott Insulator: Topological Superconductivity from the Kitaev-Heisenberg Model and possible application to (Na2/Li2)IrO3
We study the effects of doping a Mott insulator on the honeycomb lattice where spins interact via direction dependent Kitaev couplings J_K, and weak antiferromagnetic Heisenberg couplings J. This model is known to have a spin liquid ground state and may potentially be realized in correlated insulato...
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ftdatacite:10.48550/arxiv.1109.4155 2023-05-15T16:55:51+02:00 Doping a spin-orbit Mott Insulator: Topological Superconductivity from the Kitaev-Heisenberg Model and possible application to (Na2/Li2)IrO3 You, Yi-Zhuang Kimchi, Itamar Vishwanath, Ashvin 2011 https://dx.doi.org/10.48550/arxiv.1109.4155 https://arxiv.org/abs/1109.4155 unknown arXiv https://dx.doi.org/10.1103/physrevb.86.085145 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Strongly Correlated Electrons cond-mat.str-el FOS Physical sciences article-journal Article ScholarlyArticle Text 2011 ftdatacite https://doi.org/10.48550/arxiv.1109.4155 https://doi.org/10.1103/physrevb.86.085145 2022-04-01T14:05:42Z We study the effects of doping a Mott insulator on the honeycomb lattice where spins interact via direction dependent Kitaev couplings J_K, and weak antiferromagnetic Heisenberg couplings J. This model is known to have a spin liquid ground state and may potentially be realized in correlated insulators with strong spin orbit coupling. The effect of hole doping is studied within a t-J-J_K model, treated using the SU(2) slave boson formulation, which correctly captures the parent spin liquid. We find superconductor ground states with spin triplet pairing that spontaneously break time reversal symmetry. Interestingly, the pairing is qualitatively different at low and high dopings, and undergoes a first order transition with doping. At high dopings, it is smoothly connected to a paired state of electrons propagating with the underlying free particle dispersion. However, at low dopings the dispersion is strongly influenced by the magnetic exchange, and is entirely different from the free particle band structure. Here the superconductivity is fully gapped and topological, analogous to spin polarized electrons with px+ipy pairing. These results may be relevant to honeycomb lattice iridates such as A2IrO3 (A=Li or Na) on doping. : 8 pages + 6 pages supplementary material; 5 figures, 3 table Text IPY DataCite Metadata Store (German National Library of Science and Technology) |
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Strongly Correlated Electrons cond-mat.str-el FOS Physical sciences |
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Strongly Correlated Electrons cond-mat.str-el FOS Physical sciences You, Yi-Zhuang Kimchi, Itamar Vishwanath, Ashvin Doping a spin-orbit Mott Insulator: Topological Superconductivity from the Kitaev-Heisenberg Model and possible application to (Na2/Li2)IrO3 |
topic_facet |
Strongly Correlated Electrons cond-mat.str-el FOS Physical sciences |
description |
We study the effects of doping a Mott insulator on the honeycomb lattice where spins interact via direction dependent Kitaev couplings J_K, and weak antiferromagnetic Heisenberg couplings J. This model is known to have a spin liquid ground state and may potentially be realized in correlated insulators with strong spin orbit coupling. The effect of hole doping is studied within a t-J-J_K model, treated using the SU(2) slave boson formulation, which correctly captures the parent spin liquid. We find superconductor ground states with spin triplet pairing that spontaneously break time reversal symmetry. Interestingly, the pairing is qualitatively different at low and high dopings, and undergoes a first order transition with doping. At high dopings, it is smoothly connected to a paired state of electrons propagating with the underlying free particle dispersion. However, at low dopings the dispersion is strongly influenced by the magnetic exchange, and is entirely different from the free particle band structure. Here the superconductivity is fully gapped and topological, analogous to spin polarized electrons with px+ipy pairing. These results may be relevant to honeycomb lattice iridates such as A2IrO3 (A=Li or Na) on doping. : 8 pages + 6 pages supplementary material; 5 figures, 3 table |
format |
Text |
author |
You, Yi-Zhuang Kimchi, Itamar Vishwanath, Ashvin |
author_facet |
You, Yi-Zhuang Kimchi, Itamar Vishwanath, Ashvin |
author_sort |
You, Yi-Zhuang |
title |
Doping a spin-orbit Mott Insulator: Topological Superconductivity from the Kitaev-Heisenberg Model and possible application to (Na2/Li2)IrO3 |
title_short |
Doping a spin-orbit Mott Insulator: Topological Superconductivity from the Kitaev-Heisenberg Model and possible application to (Na2/Li2)IrO3 |
title_full |
Doping a spin-orbit Mott Insulator: Topological Superconductivity from the Kitaev-Heisenberg Model and possible application to (Na2/Li2)IrO3 |
title_fullStr |
Doping a spin-orbit Mott Insulator: Topological Superconductivity from the Kitaev-Heisenberg Model and possible application to (Na2/Li2)IrO3 |
title_full_unstemmed |
Doping a spin-orbit Mott Insulator: Topological Superconductivity from the Kitaev-Heisenberg Model and possible application to (Na2/Li2)IrO3 |
title_sort |
doping a spin-orbit mott insulator: topological superconductivity from the kitaev-heisenberg model and possible application to (na2/li2)iro3 |
publisher |
arXiv |
publishDate |
2011 |
url |
https://dx.doi.org/10.48550/arxiv.1109.4155 https://arxiv.org/abs/1109.4155 |
genre |
IPY |
genre_facet |
IPY |
op_relation |
https://dx.doi.org/10.1103/physrevb.86.085145 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1109.4155 https://doi.org/10.1103/physrevb.86.085145 |
_version_ |
1766046897910317056 |