arXiv: Strongly Correlated Electrons最新文献_第10页

Dynamical spin susceptibility in La2CuO4 studied by resonant inelastic x-ray scattering 用共振非弹性x射线散射研究La2CuO4的动态自旋磁化率

arXiv: Strongly Correlated Electrons Pub Date : 2020-09-27 DOI: 10.1103/PhysRevB.103.224427

H. Robarts, M. García-Fernández, J. Li, A. Nag, A. Walters, N. E. Headings, S. Hayden, K. Zhou

{"title":"Dynamical spin susceptibility in \u0000La2CuO4\u0000 studied by resonant inelastic x-ray scattering","authors":"H. Robarts, M. García-Fernández, J. Li, A. Nag, A. Walters, N. E. Headings, S. Hayden, K. Zhou","doi":"10.1103/PhysRevB.103.224427","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.224427","url":null,"abstract":"Resonant inelastic X-ray scattering (RIXS) is a powerful probe of elementary excitations in solids. It is now widely applied to study magnetic excitations. However, its complex cross-section means that RIXS has been more difficult to interpret than inelastic neutron scattering (INS). Here we report high-resolution RIXS measurements of magnetic excitations of La2CuO4, the antiferromagnetic parent of one system of high-temperature superconductors. At high energies (~2 eV), the RIXS spectra show angular-dependent dd orbital excitations which are found to be in good agreement with single-site multiplet calculations. At lower energies (<0.3 eV), we show that the wavevector-dependent RIXS intensities are proportional to the product of the single-ion spin-flip cross section and the dynamical susceptibility of the spin-wave excitations. When the spin-flip crosssection is dividing out, the RIXS magnon intensities show a remarkable resemblance to INS data. Our results show that RIXS is a quantitative probe the dynamical spin susceptibility in cuprate and therefore should be used for quantitative investigation of other correlated electron materials.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87174169","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: 4

Comparative study of the density matrix embedding theory for Hubbard models Hubbard模型密度矩阵嵌入理论的比较研究

arXiv: Strongly Correlated Electrons Pub Date : 2020-09-24 DOI: 10.1103/physrevb.102.235111

M. Kawano, C. Hotta

{"title":"Comparative study of the density matrix embedding theory for Hubbard models","authors":"M. Kawano, C. Hotta","doi":"10.1103/physrevb.102.235111","DOIUrl":"https://doi.org/10.1103/physrevb.102.235111","url":null,"abstract":"We examine the performance of the density matrix embedding theory (DMET) recently proposed in [G. Knizia and G. K.-L. Chan, Phys. Rev. Lett. 109, 186404 (2012)]. The core of this method is to find a proper one-body potential that generates a good trial wave function for projecting a large scale original Hamiltonian to a local subsystem with a small number of basis. The resultant ground state of the projected Hamiltonian can locally approximate the true ground state. However, the lack of the variational principle makes it difficult to judge the quality of the choice of the potential. Here we focus on the entanglement spectrum (ES) as a judging criterion; accurate evaluation of the ES guarantees that the corresponding reduced density matrix well reproduces all physical quantities on the local subsystem. We apply the DMET to the Hubbard model on the one-dimensional chain, zigzag chain, and triangular lattice and test several variants of potentials and cost functions. It turns out that a symmetric potential reproduces the ES of the phase that continues from a noninteracting limit. The Mott transition as well as symmetry-breaking transitions can be detected by the singularities in the ES. However, the details of the ES in the strongly interacting parameter region depends much on these choices, meaning that the present algorithm allowing for numerous variants of the DMET is insufficient to fully fix the quantum many-body problem.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73859803","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

Spatial locality of electronic correlations in LiFeAs LiFeAs中电子相关的空间局部性

arXiv: Strongly Correlated Electrons Pub Date : 2020-09-22 DOI: 10.1103/PHYSREVB.103.155107

Minjae Kim, H. Miao, Sang-Jun Choi, M. Zingl, A. Georges, G. Kotliar

引用次数: 4

Magnetic mixed valent semimetal EuZnSb2 with Dirac states in the band structure 带结构中具有狄拉克态的磁性混合价半金属EuZnSb2

arXiv: Strongly Correlated Electrons Pub Date : 2020-09-22 DOI: 10.1103/PhysRevResearch.2.033462

Aifeng Wang, S. Baranets, Yu Liu, X. Tong, E. Stavitski, Jing Zhang, Y. Chai, W. Yin, S. Bobev, C. Petrovic

引用次数: 8

Influence Matrix Approach to Many-Body Floquet Dynamics 多体Floquet动力学的影响矩阵法

arXiv: Strongly Correlated Electrons Pub Date : 2020-09-21 DOI: 10.1103/PhysRevX.11.021040

A. Lerose, M. Sonner, D. Abanin

{"title":"Influence Matrix Approach to Many-Body Floquet Dynamics","authors":"A. Lerose, M. Sonner, D. Abanin","doi":"10.1103/PhysRevX.11.021040","DOIUrl":"https://doi.org/10.1103/PhysRevX.11.021040","url":null,"abstract":"In this work, we introduce an approach to study quantum many-body dynamics, inspired by the Feynman-Vernon influence functional. Focusing on a family of interacting, Floquet spin chains, we consider a Keldysh path-integral description of the dynamics. The central object in our approach is the influence matrix (IM), which describes the effect of the system on the dynamics of a local subsystem. For translationally invariant models, we formulate a self-consistency equation for the influence matrix. For certain special values of the model parameters, we obtain an exact solution which represents a perfect dephaser (PD). Physically, a PD corresponds to a many-body system that acts as a perfectly Markovian bath on itself: at each period, it measures every spin. For the models considered here, we establish that PD points include dual-unitary circuits investigated in recent works. In the vicinity of PD points, the system is not perfectly Markovian, but rather acts as a bath with a short memory time. In this case, we demonstrate that the self-consistency equation can be solved using matrix-product states (MPS) methods, as the IM temporal entanglement is low. A combination of analytical insights and MPS computations allows us to characterize the structure of the influence matrix in terms of an effective \"statistical-mechanics\" description. We finally illustrate the predictive power of this description by analytically computing how quickly an embedded impurity spin thermalizes. The influence matrix approach formulated here provides an intuitive view of the quantum many-body dynamics problem, opening a path to constructing models of thermalizing dynamics that are solvable or can be efficiently treated by MPS-based methods, and to further characterizing quantum ergodicity or lack thereof.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89895644","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: 57

Fermion parity gap and exponential ground state degeneracy of the one-dimensional Fermi gas with intrinsic attractive interaction 具有本征吸引相互作用的一维费米气体的费米子宇称隙和指数基态简并

arXiv: Strongly Correlated Electrons Pub Date : 2020-09-21 DOI: 10.1103/PHYSREVB.102.125135

Monalisa Singh Roy, Manoranjan Kumar, J. Sau, S. Tewari

{"title":"Fermion parity gap and exponential ground state degeneracy of the one-dimensional Fermi gas with intrinsic attractive interaction","authors":"Monalisa Singh Roy, Manoranjan Kumar, J. Sau, S. Tewari","doi":"10.1103/PHYSREVB.102.125135","DOIUrl":"https://doi.org/10.1103/PHYSREVB.102.125135","url":null,"abstract":"We examine the properties of a one-dimensional (1D) Fermi gas with attractive intrinsic (Hubbard) interactions in the presence of spin-orbit coupling and Zeeman field by numerically computing the pair binding energy, excitation gap, and susceptibility to local perturbations using the density matrix renormalization group. Such a system can, in principle, be realized in a system of ultracold atoms confined in a 1D optical lattice. We note that, in the presence of spatial interfaces introduced by a smooth parabolic potential, the pair binding and excitation energy of the system decays exponentially with the system size, pointing to the existence of an exponential ground state degeneracy, and is consistent with recent works. However, the susceptibility of the ground state degeneracy of this number-conserving system to local impurities indicates that the energy gap vanishes as a power law with the system size in the presence of local perturbations. We compare this system with the more familiar system of an Ising antiferromagnet in the presence of a transverse field realized with Rydberg atoms and argue that the exponential splitting in the clean number-conserving 1D Fermi system is similar to a phase with only conventional order.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82398980","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

Electron-phonon hydrodynamics 电子声子流体动力学

arXiv: Strongly Correlated Electrons Pub Date : 2020-09-21 DOI: 10.1103/PhysRevB.103.155128

Xiao-Li Huang, A. Lucas

引用次数: 23

Floquet dynamical phase transition and entanglement spectrum Floquet动态相变与纠缠谱

arXiv: Strongly Correlated Electrons Pub Date : 2020-09-20 DOI: 10.1103/PhysRevA.103.012204

R. Jafari, A. Akbari

引用次数: 27

Direct and ultrafast probing of quantum many-body interaction and Mott-insulator transition through coherent two-dimensional spectroscopy 利用相干二维光谱直接超快探测量子多体相互作用和莫特-绝缘体跃迁

arXiv: Strongly Correlated Electrons Pub Date : 2020-09-18 DOI: 10.1103/PhysRevB.104.115105

N. Phuc, P. Q. Trung

引用次数: 1

Ferrimagnetic 120∘magnetic structure inCu2OSO4 120°磁性结构inCu2OSO4

arXiv: Strongly Correlated Electrons Pub Date : 2020-09-18 DOI: 10.1103/PhysRevB.102.094422

V. Favre, G. Tucker, C. Ritter, R. Sibille, P. Manuel, M. Frontzek, M. Kriener, Lin Yang, H. Berger, A. Magrez, N. Casati, I. Živković, H. Rønnow

{"title":"Ferrimagnetic 120∘magnetic structure inCu2OSO4","authors":"V. Favre, G. Tucker, C. Ritter, R. Sibille, P. Manuel, M. Frontzek, M. Kriener, Lin Yang, H. Berger, A. Magrez, N. Casati, I. Živković, H. Rønnow","doi":"10.1103/PhysRevB.102.094422","DOIUrl":"https://doi.org/10.1103/PhysRevB.102.094422","url":null,"abstract":"We report magnetic properties of a 3d$^9$ (Cu$^{2+}$) magnetic insulator Cu2OSO4 measured on both powder and single crystal. The magnetic atoms of this compound form layers, whose geometry can be described either as a system of chains coupled through dimers or as a Kagom'e lattice where every 3rd spin is replaced by a dimer. Specific heat and DC-susceptibility show a magnetic transition at 20 K, which is also confirmed by neutron scattering. Magnetic entropy extracted from the specific heat data is consistent with a $S=1/2$ degree of freedom per Cu$^{2+}$, and so is the effective moment extracted from DC-susceptibility. The ground state has been identified by means of neutron diffraction on both powder and single crystal and corresponds to a $sim120$ degree spin structure in which ferromagnetic intra-dimer alignment results in a net ferrimagnetic moment. No evidence is found for a change in lattice symmetry down to 2 K. Our results suggest that sample represents a new type of model lattice with frustrated interactions where interplay between magnetic order, thermal and quantum fluctuations can be explored.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"37 Suppl 7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78337548","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