arXiv: Strongly Correlated Electrons最新文献

Electronic and magnetic properties of iridium ilmenites $A$IrO$_3$ ($A=$ Mg, Zn, and Mn). 铱钛矿$A$IrO$_3$ ($A=$ Mg, Zn和Mn)的电子和磁性能。

arXiv: Strongly Correlated Electrons Pub Date : 2021-06-26 DOI: 10.1103/PhysRevMaterials.5.104409

Seong-Hoon Jang, Y. Motome

{"title":"Electronic and magnetic properties of iridium ilmenites $A$IrO$_3$ ($A=$ Mg, Zn, and Mn).","authors":"Seong-Hoon Jang, Y. Motome","doi":"10.1103/PhysRevMaterials.5.104409","DOIUrl":"https://doi.org/10.1103/PhysRevMaterials.5.104409","url":null,"abstract":"We theoretically investigate the electronic band structures and magnetic properties of ilmenites with edge-sharing IrO$_6$ honeycomb layers, $A$IrO$_3$ with $A=$ Mg, Zn, and Mn, in comparison with a collinear antiferromagnet MnTiO$_3$. The compounds with $A=$ Mg and Zn were recently reported in Y.~Haraguchi {it et al.}, Phys. Rev. Materials {bf 2}, 054411 (2018), while MnIrO$_3$ has not been synthesized yet but the honeycomb stacking structure was elaborated in a superlattice with MnTiO$_3$ in K.~Miura {it et al.}, Commun. Mater. {bf 1}, 55 (2020). We find that, in contrast to MnTiO$_3$, where an energy gap opens in the Ti $3d$ bands by antiferromagnetic ordering of the high-spin $S=5/2$ moments, MgIrO$_3$ and ZnIrO$_3$ have a gap in the Ir $5d$ bands under the influence of both spin-orbit coupling and electron correlation. Their electronic structures are similar to those in the spin-orbit coupled Mott insulators with the $j_{rm eff}=1/2$ pseudospin degree of freedom, as found in monoclinic $A_2$IrO$_3$ with $A=$ Na and Li which have been studied as candidates for the Kitaev spin liquid. Indeed, we find that the effective exchange interactions between the $j_{rm eff}=1/2$ pseudospins are dominated by the Kitaev-type bond-dependent interaction and the symmetric off-diagonal interactions. On the other hand, for MnIrO$_3$, we show that the local lattice structure is largely deformed, and both Mn $3d$ and Ir $5d$ bands appear near the Fermi level in a complicated manner, which makes the electronic and magnetic properties qualitatively different from MgIrO$_3$ and ZnIrO$_3$. Our results indicate that the IrO$_6$ honeycomb network in the ilmenites $A$IrO$_3$ with $A=$ Mg and Zn would offer a good platform for exotic magnetism by the spin-orbital entangled moments like the Kitaev spin liquid.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91170532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Landau-Fermi liquids in disguise 伪装的朗多-费米液体

arXiv: Strongly Correlated Electrons Pub Date : 2021-05-26 DOI: 10.21203/RS.3.RS-569113/V1

M. Fabrizio

引用次数: 0

Diffusion in the Anderson model in higher dimensions 高维的安德森模型中的扩散

arXiv: Strongly Correlated Electrons Pub Date : 2021-04-15 DOI: 10.1103/PhysRevB.103.L241107

P. Prelovšek, J. Herbrych

引用次数: 5

Discovery of an ultra-quantum spin liquid 超量子自旋液体的发现

arXiv: Strongly Correlated Electrons Pub Date : 2021-04-02 DOI: 10.21203/RS.3.RS-351743/V1

Yanxing Yang, Cheng Tan, Zihao Zhu, Jing Zhang, Z. Ding, Qiong Wu, Changshen Chen, T. Shiroka, Douglas MacLaughline, C. Varma, L. Shu

{"title":"Discovery of an ultra-quantum spin liquid","authors":"Yanxing Yang, Cheng Tan, Zihao Zhu, Jing Zhang, Z. Ding, Qiong Wu, Changshen Chen, T. Shiroka, Douglas MacLaughline, C. Varma, L. Shu","doi":"10.21203/RS.3.RS-351743/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-351743/V1","url":null,"abstract":"\u0000 Quantum fluctuations are expected to lead to highly entangled spin-liquid states in some two-dimensional spin-1/2 compounds. We have synthesized and measured thermodynamic properties and muon relaxation rates in two related such compounds, one of which is the least disordered of this kind synthesized hitherto and reveals intrinsic properties of a class of spin-liquids. Its measured properties can all be simply characterized by scale invariant time-dependent fluctuations with a single parameter. The specific heat divided by temperature and muon relaxation rates are both temperature independent at low temperatures, followed by a logarithmic decrease with increasing temperature. Even more remarkably, ∼57% of the magnetic entropy is missing down to temperatures of O(10−3) the exchange energy, independent of magnetic field up to gµBH > kBT . This is evidence that quantum fluctuations lead either to a gigantic specific heat peak from topological singlet excitations below such temperatures, or to an extensively degenerate topological singlet ground state. These results reveal an ultra-quantum state of matter.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88830338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Topological excitations in quasi two-dimensional quantum magnets with weak interlayer interactions 具有弱层间相互作用的准二维量子磁体的拓扑激发

arXiv: Strongly Correlated Electrons Pub Date : 2021-02-28 DOI: 10.32657/10356/146503

D. Bhowmick

{"title":"Topological excitations in quasi two-dimensional quantum magnets with weak interlayer interactions","authors":"D. Bhowmick","doi":"10.32657/10356/146503","DOIUrl":"https://doi.org/10.32657/10356/146503","url":null,"abstract":"The study of topological magnetic excitations has attracted widespread attention in the past few years. In this thesis, I have studied some examples of novel topological magnonic phases/phenomena in low-dimensional quantum magnets. The first chapter motivates the research based on the research gap in this field of study. The second chapter is written to make the thesis self-sufficient and the concepts are explained through examples. In the second chapter, the following formalisms and physical observables are described: Holstein-Primakoff, bond operator, Schwinger boson, Bogoliubov-Valatin, Group theory, Berry-phase, Berry-curvature, Chern number, thermal Hall conductance, Nernst conductivity, dynamical spin structure factor, edge-current. The main results of the thesis are shown in the third, fourth, and fifth chapters. In the third chapter, I have shown that anti-chiral edge states (co-propagating edge states) arise in the ferromagnetic Heisenberg model on the honeycomb lattice with Dzyaloshinskii-Moriya (DM) interactions. My results suggest that such anti-chiral edge states may be induced in certain realistic models of quantum magnets. In the fourth chapter, I have found the emergence of many magnon band-topological phases in the flux state of the Shastry-Sutherland model. I have derived a simple analytical form of the temperature dependence of derivative of thermal Hall conductivity near the band topological transition point which I propose to be experimentally useful. In the fifth chapter, I have investigated the emergence of Weyl triplons due to inter-layer DM-interaction in a microscopic model of SrCu2(BO3)2, a widely studied frustrated quantum magnet. I have shown that the thermal magnon Hall conductivity has a quasi-linear dependence as a function of the magnetic field in a Weyl-triplon region.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75983726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Abelian parton state for the ν=4/11 fractional quantum Hall effect ν=4/11分数量子霍尔效应的阿贝尔部分态

arXiv: Strongly Correlated Electrons Pub Date : 2021-02-08 DOI: 10.1103/PHYSREVB.103.155103

Ajit C. Balram

引用次数: 5

Doping-dependent character and possible magnetic ordering of NdNiO2 NdNiO2掺杂依赖性及可能的磁有序性

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-17 DOI: 10.1103/PHYSREVMATERIALS.5.044803

F. Lechermann

{"title":"Doping-dependent character and possible magnetic ordering of \u0000NdNiO2","authors":"F. Lechermann","doi":"10.1103/PHYSREVMATERIALS.5.044803","DOIUrl":"https://doi.org/10.1103/PHYSREVMATERIALS.5.044803","url":null,"abstract":"The novel nickelate superconductors of infinite-layer type feature challenging electronic pecularities in the normal-state phase diagram with doping. Distinct many-body behavior and different dispersion regimes of the entangled ${$Ni-$d_{z^2}$, Ni-$d_{x^2-y^2}$$}$ orbital sector give rise to highly rich physics, which is here studied for the case of the NdNiO$_2$ system. An analysis based on advanced realistic dynamical mean-field theory unveils that the superconducting hole-doped region is the meeting place of a (self-)doped Mott insulator from the underdoped side, and a bad Hund metal from the overdoped side. Fermi-level crossing of the Ni-$d_{z^2}$ flat-band ties both regimes together to form a singular arena for unconventional superconductivity. We furthermore shed light on the intriguing problem of elusive magnetism in infinite-layer nickelates. Antiferromagnetic (AFM) order with small Ni moments is shown to be a vital competitor at low temperature. At stoichiometry, C-AFM order with ferro-alignment along the $c$-axis benefits from a conceivable coexistence with Kondo(-lattice) screening, whereas N{e}el-type G-AFM order has to be faced for dopings where superconductivity prevails.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88852457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 26

Magnetic Compton profiles of Ni beyond the one-particle picture: Numerically exact and perturbative solvers of dynamical mean-field theory 超越单粒子图像的Ni磁康普顿剖面:动态平均场理论的数值精确和微扰解算

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-16 DOI: 10.1103/PhysRevB.103.115144

A. James, M. Sekania, S. Dugdale, L. Chioncel

引用次数: 5

Thermodynamically stable skyrmion lattice in a tetragonal frustrated antiferromagnet with dipolar interaction 具有偶极相互作用的四方受挫反铁磁体中热力学稳定的斯基子晶格

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-15 DOI: 10.1103/PHYSREVB.103.064414

O. Utesov

{"title":"Thermodynamically stable skyrmion lattice in a tetragonal frustrated antiferromagnet with dipolar interaction","authors":"O. Utesov","doi":"10.1103/PHYSREVB.103.064414","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.064414","url":null,"abstract":"Motivated by recent experimental results on GdRu$_2$Si$_2$ [Khanh, N.D., Nakajima, T., Yu, X. et al., emph{Nat. Nanotechnol.} textbf{15}, 444-449 (2020)], where nanometric square skyrmion lattice was observed, we propose simple analytical mean-field description of the high-temperature part of the phase diagram of centrosymmetric tetragonal frustrated antiferromagnets with dipolar interaction in the external magnetic field. In the reciprocal space dipolar forces provide momentum dependent biaxial anisotropy. It is shown that in tetragonal lattice in the large part of the Brillouin zone for mutually perpendicular modulation vectors in the $ab$ plane this anisotropy has mutually perpendicular easy axes and collinear middle axes, what leads to double-Q modulated spin structure stabilization. The latter turns out to be a square skyrmion lattice in the large part of its stability region with the topological charge $pm 1$ per magnetic unit cell, which is determined by the frustrated exchange coupling, and, thus, nanometer-sized. In the presence of additional single-ion easy-axis anisotropy, easy and middle axes can be swapped, which leads to different phase diagram. It is argued that the latter case is relevant to GdRu$_2$Si$_2$.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86760369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Modeling multiorbital effects in Sr2IrO4 under strain and a Zeeman field Sr2IrO4在应变和塞曼场下的多轨道效应模拟

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-15 DOI: 10.1103/physrevb.103.155147

L. Engström, T. Pereg-Barnea, W. Witczak-Krempa

引用次数: 4