arXiv: Strongly Correlated Electrons最新文献_第7页

Hyperfine couplings as a probe of orbital anisotropy in heavy-fermion materials 超精细耦合作为重费米子材料轨道各向异性的探针

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-16 DOI: 10.1103/PhysRevB.104.035154

P. Menegasso, J. Souza, I. Vinograd, Z. Wang, S. Edwards, P. Pagliuso, N. Curro, R. Urbano

引用次数: 1

Finite-temperature symmetric tensor network for spin-1/2 Heisenberg antiferromagnets on the square lattice 方形晶格上自旋1/2海森堡反铁磁体的有限温度对称张量网络

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-15 DOI: 10.21468/SCIPOSTPHYS.10.1.019

D. Poilblanc, M. Mambrini, F. Alet

{"title":"Finite-temperature symmetric tensor network for spin-1/2 Heisenberg antiferromagnets on the square lattice","authors":"D. Poilblanc, M. Mambrini, F. Alet","doi":"10.21468/SCIPOSTPHYS.10.1.019","DOIUrl":"https://doi.org/10.21468/SCIPOSTPHYS.10.1.019","url":null,"abstract":"Within the tensor network framework, the (positive) thermal density operator can be approximated by a double layer of infinite Projected Entangled Pair Operator (iPEPO) coupled via ancilla degrees of freedom. To investigate the thermal properties of the spin-1/2 Heisenberg model on the square lattice, we introduce a family of fully spin-$SU(2)$ and lattice-$C_{4v}$ symmetric on-site tensors (of bond dimensions $D=4$ or $D=7$) and a plaquette-based Trotter-Suzuki decomposition of the imaginary-time evolution operator. A variational optimization is performed on the plaquettes, using a full (for $D=4$) or simple (for $D=7$) environment obtained from the single-site Corner Transfer Matrix Renormalization Group fixed point. The method is benchmarked by a comparison to quantum Monte Carlo in the thermodynamic limit. Although the iPEPO spin correlation length starts to deviate from the exact exponential growth for inverse-temperature $beta gtrsim 2$, the behavior of various observables turns out to be quite accurate once plotted w.r.t the inverse correlation length. We also find that a direct $T=0$ variational energy optimization provides results in full agreement with the $betarightarrowinfty$ limit of finite-temperature data, hence validating the imaginary-time evolution procedure. Extension of the method to frustrated models is described and preliminary results are shown.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72571196","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: 8

Charge disproportionation in the spin-liquid candidate κ−(ET)2Cu2(CN)3 at 6 K revealed by Cu63 NQR measurements Cu63 NQR测量揭示了自旋液体候选物κ−(ET)2Cu2(CN)3在6k时的电荷歧化现象

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-15 DOI: 10.1103/physrevresearch.2.042023

T. Kobayashi, Q. Ding, H. Taniguchi, K. Satoh, A. Kawamoto, Y. Furukawa

引用次数: 8

Statistics-tuned entanglement of the boundary modes in coupled Su-Schrieffer-Heeger chains 耦合Su-Schrieffer-Heeger链中边界模的统计调谐纠缠

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-14 DOI: 10.1103/PhysRevB.103.195134

Saikat Santra, A. Agarwala, S. Bhattacharjee

{"title":"Statistics-tuned entanglement of the boundary modes in coupled Su-Schrieffer-Heeger chains","authors":"Saikat Santra, A. Agarwala, S. Bhattacharjee","doi":"10.1103/PhysRevB.103.195134","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.195134","url":null,"abstract":"We show that mutual statistics between quantum particles can be tuned to generate emergent novel few particle quantum mechanics for the boundary modes of symmetry-protected topological phases of matter. As a concrete setting, we study a system of pseudofermions, defined as quantum particles with tunable algebra, which lie on two distinct Su-Schrieffer-Heeger (SSH) chains. We find that as the mutual statistics of the particles are tuned -- the boundary modes present in the two chains gets non-trivially entangled showing a sudden jump in their mutual entanglement entropy. We further show that, such tuning of statistics engenders a first-order transition between two topologically non-trivial phases which differ in the behavior of inter-chain entanglement. Using a combination of analytical and numerical techniques and effective modeling, we uncover the rich physics that this system hosts. The results are of particular relevance in context of the study of the effective low energy quantum mechanics of topological edge modes in one hand and their recent realization in ultracold atoms on the other. This then provides for controlled manipulation of such low energy modes.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80529879","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: 2

Formation of spatial patterns by spin-selective excitations of interacting fermions 相互作用费米子的自旋选择性激发形成的空间模式

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-14 DOI: 10.1103/physrevb.102.235166

T. Köhler, S. Paeckel, C. Meyer, S. Manmana

引用次数: 1

Ab initio construction of the energy density functional for electron systems with the functional-renormalization-group-aided density functional theory 用泛函-重整化-群辅助密度泛函理论从头构造电子系统的能量密度泛函

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-14 DOI: 10.1103/PhysRevResearch.3.L012015

Takeru Yokota, T. Naito

引用次数: 3

Generalized diagonalization scheme for many-particle systems 多粒子系统的广义对角化格式

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-14 DOI: 10.1103/PhysRevB.102.165122

S. Sykora, A. Hubsch, K. Becker

引用次数: 4

Weakly coupled alternating S=12 chains in the distorted honeycomb lattice compound Na2Cu2TeO6 变形蜂窝晶格化合物Na2Cu2TeO6中弱耦合交替S=12链

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-14 DOI: 10.1103/physrevb.102.220402

S. Gao, Ling-Fang Lin, A. May, B. Rai, Qiang Zhang, E. Dagotto, A. Christianson, M. Stone

{"title":"Weakly coupled alternating \u0000S=12\u0000 chains in the distorted honeycomb lattice compound \u0000Na2Cu2TeO6","authors":"S. Gao, Ling-Fang Lin, A. May, B. Rai, Qiang Zhang, E. Dagotto, A. Christianson, M. Stone","doi":"10.1103/physrevb.102.220402","DOIUrl":"https://doi.org/10.1103/physrevb.102.220402","url":null,"abstract":"Spin-1/2 chains with alternating antiferromagnetic (AF) and ferromagnetic (FM) couplings exhibit quantum entanglement like the integer-spin Haldane chains and might be similarly utilized for quantum computations. Such alternating AF-FM chains have been proposed to be realized in the distorted honeycomb-lattice compound Na$_2$Cu$_2$TeO$_6$, but to confirm this picture a comprehensive understanding of the exchange interactions including terms outside of the idealized model is required. Here we employ neutron scattering to study the spin dynamics in Na$_2$Cu$_2$TeO$_6$ and accurately determine the coupling strengths through the random phase approximation and density functional theory (DFT) approaches. We find the AF and FM intrachain couplings are the dominant terms in the spin Hamiltonian, while the interchain couplings are AF but perturbative. This hierarchy in the coupling strengths and the alternating signs of the intrachain couplings can be understood through their different exchange paths. Our results establish Na$_2$Cu$_2$TeO$_6$ as a weakly-coupled alternating AF-FM chain compound and reveal the robustness of the gapped ground state in alternating chains under weak interchain couplings.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90609751","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

Competing spin modulations in the magnetically frustrated semimetal EuCuSb 磁阻半金属EuCuSb中的竞争自旋调制

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-14 DOI: 10.1103/physrevb.102.174425

Hidefumi Takahashi, K. Aono, Y. Nambu, R. Kiyanagi, T. Nomoto, M. Sakano, K. Ishizaka, R. Arita, S. Ishiwata

{"title":"Competing spin modulations in the magnetically frustrated semimetal EuCuSb","authors":"Hidefumi Takahashi, K. Aono, Y. Nambu, R. Kiyanagi, T. Nomoto, M. Sakano, K. Ishizaka, R. Arita, S. Ishiwata","doi":"10.1103/physrevb.102.174425","DOIUrl":"https://doi.org/10.1103/physrevb.102.174425","url":null,"abstract":"The competing magnetic ground states of the itinerant magnet EuCuSb, which has a hexagonal layered structure, were studied via magnetization, resistivity, and neutron diffraction measurements on single-crystal samples. EuCuSb has a three-dimensional semimetallic band structure as confirmed by band calculation and angle-resolved photoelectron spectroscopy, consistent with the nearly isotropic metallic conductivity in the paramagnetic state. However, below the antiferromagnetic transition temperature of TN1 (8.5 K), the resistivity, especially along the hexagonal axis, increases significantly. This implies the emergence of anisotropic magnetic ordering coupled to the conducting electrons. Neutron diffraction measurements show that the Eu spins, which order ferromagnetically within each layer, are collinearly modulated (up-up-down-down) along the hexagonal axis below TN1, followed by the partial emergence of helical spin modulation below TN2 (6 K). Based on the observation of anomalous magnetoresistance with hysteretic behavior, we discuss the competing nature of the ground state inherent in a frustrated Heisenberg-like spin system with a centrosymmetric structure.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"142 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77766187","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

Quantum operator growth bounds for kicked tops and semiclassical spin chains 踢顶和半经典自旋链的量子算子生长界

arXiv: Strongly Correlated Electrons Pub Date : 2020-10-13 DOI: 10.1103/PhysRevA.103.042414

Chao Yin, A. Lucas

引用次数: 17