arXiv: Strongly Correlated Electrons最新文献_第2页

Antiferromagnetic fluctuations in the one-dimensional Hubbard model 一维哈伯德模型中的反铁磁波动

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-14 DOI: 10.1063/9.0000019

V. Janiš, A. Klíč, Jiawei Yan

引用次数: 1

Molecular dipoles in designer honeycomb lattices 设计蜂窝晶格中的分子偶极子

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-14 DOI: 10.1103/PHYSREVB.103.165408

N. Boudjada, F. Buessen, A. Paramekanti

{"title":"Molecular dipoles in designer honeycomb lattices","authors":"N. Boudjada, F. Buessen, A. Paramekanti","doi":"10.1103/PHYSREVB.103.165408","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.165408","url":null,"abstract":"Recent advances in ultracold atoms in optical lattices and developments in surface science have allowed for the creation of artificial lattices as well as the control of many-body interactions. Such systems provide new settings to investigate interaction-driven instabilities and non-trivial topology. In this work, we explore the interplay between molecular electric dipoles on a two-dimensional triangular lattice with fermions hopping on the dual decorated honeycomb lattice which hosts Dirac and flat band states. We show that short-range dipole-dipole interaction can lead to ordering into various stripe and vortex crystal ground states. We study these ordered states and their thermal transitions as a function of the interaction range using simulated annealing and Monte Carlo methods. For the special case of zero wavevector ferro-dipolar order, we show that incorporating dipole-electron interactions and integrating out the electrons can lead to a six-fold clock anisotropy for the dipole ordering. Finally, we discuss the impact of the various dipole orders on the electronic band structure and the local tunneling density of states. Our work may be relevant to studies of \"molecular graphene\" -- CO molecules arranged on the Cu(111) surface -- which have been explored using scanning tunneling spectroscopy, as well as ultracold molecule-fermion mixtures in optical lattices.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91271146","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

Ground-state phase diagram of the one-dimensional t−Js−Jτ model at quarter filling 四分之一填充时一维t−Js−Jτ模型的基态相图

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-13 DOI: 10.1103/PHYSREVB.103.165115

Yuya Kurebayashi, Hiroki Oshiyama, N. Shibata

引用次数: 0

Colorful points in the XY regime of XXZ quantum magnets XXZ量子磁体XY区域的彩色点

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-10 DOI: 10.1103/PHYSREVB.103.144414

Santanu Pal, Prakash C. Sharma, Hitesh J. Changlani, Sumiran Pujari

{"title":"Colorful points in the XY regime of XXZ quantum magnets","authors":"Santanu Pal, Prakash C. Sharma, Hitesh J. Changlani, Sumiran Pujari","doi":"10.1103/PHYSREVB.103.144414","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.144414","url":null,"abstract":"In the $XY$ regime of the $XXZ$ Heisenberg model phase diagram, we demonstrate that the origin of magnetically ordered phases is influenced by the presence of solvable points with exact quantum coloring ground states featuring a quantum-classical correspondence. Using exact diagonalization and density matrix renormalization group calculations, for both the square and the triangular lattice magnets, we show that the ordered physics of the solvable points in the extreme $XY$ regime, at $frac{J_z}{J_perp}=-1$ and $frac{J_z}{J_perp}=-frac{1}{2}$ respectively with $J_perp > 0$, adiabatically extends to the more isotropic regime $frac{J_z}{J_perp} sim 1$. We highlight the projective structure of the coloring ground states to compute the correlators in fixed magnetization sectors which enables an understanding of the features in the static spin structure factors and correlation ratios. These findings are contrasted with an anisotropic generalization of the celebrated one-dimensional Majumdar-Ghosh model, which is also found to be (ground state) solvable. For this model, both exact dimer and three-coloring ground states exist at $frac{J_z}{J_perp}=-frac{1}{2}$ but only the two dimer ground states survive for any $frac{J_z}{J_perp} > -frac{1}{2}$","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85771561","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

Evolution of helimagnetic correlations when approaching the quantum critical point of Mn1−xFexSi 接近Mn1 - xFexSi量子临界点时磁相关的演化

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-09 DOI: 10.1103/PHYSREVRESEARCH.3.013019

C. Pappas, A. Leonov, L. Bannenberg, P. Fouquet, Thomas Wolf, F. Weber

{"title":"Evolution of helimagnetic correlations when approaching the quantum critical point of \u0000Mn1−xFexSi","authors":"C. Pappas, A. Leonov, L. Bannenberg, P. Fouquet, Thomas Wolf, F. Weber","doi":"10.1103/PHYSREVRESEARCH.3.013019","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013019","url":null,"abstract":"We present a comprehensive investigation of the evolution of helimagnetic correlations in Mn$_{1-x}$Fe$_x$Si with increasing doping. By combining polarised neutron scattering and high resolution Neutron Spin Echo spectroscopy we investigate three samples with $x$=0.09, 0.11 and 0.14, i.e. with compositions on both sides of the concentration $x^* sim 0.11$ where the helimagnetic Bragg peaks disappear and between $x^*$ and the quantum critical concentration $x_C sim 0.17$, where $T_C$ vanishes. We find that the abrupt disappearance of the long range helical periodicity at $x^*$, does not affect the precursor fluctuating correlations. These build up with decreasing temperature in a similar way as for the parent compound MnSi. Also the dynamics bears strong similarities to MnSi. The analysis of our results indicates that frustration, possibly due to achiral RKKY interactions, increases with increasing Fe doping. We argue that this effect explains both the expansion of the precursor phase with increasing $x$ and the abrupt disappearance of long range helimagnetic periodicity at $x^*$.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73630527","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

Impact of next-nearest-neighbor hopping on ferromagnetism in diluted magnetic semiconductors 稀释磁性半导体中次近邻跳变对铁磁性的影响

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-08 DOI: 10.1103/physrevb.102.245112

Sourav Chakraborty, S. Das, K. Pradhan

引用次数: 0

On Sharp Enhancement of Effective Mass of Quasiparticles and Coefficient of T2 Term of Resistivity around First-Order Metamagnetic Transition Observed in UTe2 UTe2一阶变磁跃迁前后准粒子有效质量和电阻率T2项系数的急剧增强

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-08 DOI: 10.7566/jpsj.90.024701

K. Miyake

引用次数: 2

Magnetic anisotropy from linear defect structures in correlated electron systems 相关电子系统中线性缺陷结构的磁各向异性

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-07 DOI: 10.1103/PhysRevB.103.245132

Mainak Pal, Laetitia Bettmann, A. Kreisel, P. Hirschfeld

引用次数: 1

Surface charge induced Dirac band splitting in a charge density wave material (TaSe4)2I 表面电荷诱导电荷密度波材料(TaSe4)2I的Dirac能带分裂

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-04 DOI: 10.1103/PHYSREVRESEARCH.3.013271

H. Yi, Zengle Huang, W. Shi, L. Min, R. Wu, C. Polley, Ruoxi Zhang, Yi-Fan Zhao, Ling Zhou, J. Adell, X. Gui, W. Xie, M. Chan, Z. Mao, Zhijun Wang, Weida Wu, Cui-Zu Chang

{"title":"Surface charge induced Dirac band splitting in a charge density wave material \u0000(TaSe4)2I","authors":"H. Yi, Zengle Huang, W. Shi, L. Min, R. Wu, C. Polley, Ruoxi Zhang, Yi-Fan Zhao, Ling Zhou, J. Adell, X. Gui, W. Xie, M. Chan, Z. Mao, Zhijun Wang, Weida Wu, Cui-Zu Chang","doi":"10.1103/PHYSREVRESEARCH.3.013271","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013271","url":null,"abstract":"(TaSe4)2I, a quasi-one-dimensional (1D) crystal, shows a characteristic temperature-driven metal-insulator phase transition. Above the charge density wave (CDW) temperature Tc, (TaSe4)2I has been predicted to harbor a Weyl semimetal phase. Below Tc, it becomes an axion insulator. Here, we perform angle-resolved photoemission spectroscopy (ARPES) measurements on the (110) surface of (TaSe4)2I and observe two sets of Dirac-like energy bands in the first Brillion zone, which agree well with our first-principles calculations. Moreover, we find that each Dirac band exhibits an energy splitting of hundreds of meV under certain circumstances. In combination with core level measurements, our theoretical analysis shows that this Dirac band splitting is a result of surface charge polarization due to the loss of surface iodine atoms. Our findings here shed new light on the interplay between band topology and CDW order in Peierls compounds and will motivate more studies on topological properties of strongly correlated quasi-1D materials.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83223908","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

Local moments versus itinerant antiferromagnetism: Magnetic phase diagram and spectral properties of the anisotropic square lattice Hubbard model 局部矩与流动反铁磁性:各向异性方晶格Hubbard模型的磁相图和光谱特性

arXiv: Strongly Correlated Electrons Pub Date : 2020-12-02 DOI: 10.1103/PHYSREVB.103.125137

M. Raczkowski, F. Assaad, M. Imada

{"title":"Local moments versus itinerant antiferromagnetism: Magnetic phase diagram and spectral properties of the anisotropic square lattice Hubbard model","authors":"M. Raczkowski, F. Assaad, M. Imada","doi":"10.1103/PHYSREVB.103.125137","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.125137","url":null,"abstract":"Using a cluster extension of the dynamical mean-field theory (CDMFT) we map out the magnetic phase diagram of the anisotropic square lattice Hubbard model with nearest-neighbor intrachain $t$ and interchain $t_{perp}$ hopping amplitudes at half-filling. A fixed value of the next-nearest-neighbor hopping $t'=-t_{perp}/2$ removes the nesting property of the Fermi surface and stabilizes a paramagnetic metal phase in the weak-coupling regime. In the isotropic and moderately anisotropic regions, a growing spin entropy in the metal phase is quenched out at a critical interaction strength by the onset of long-range antiferromagnetic (AF) order of preformed local moments. It gives rise to a first-order metal-insulator transition consistent with the Mott-Heisenberg picture. In contrast, a strongly anisotropic regime $t_{perp}/tlesssim 0.3$ displays a quantum critical behavior related to the continuous transition between an AF metal phase and the AF insulator. Hence, within the present framework of CDMFT, the opening of the charge gap is magnetically driven as advocated in the Slater picture. We also discuss how the lattice-anisotropy-induced evolution of the electronic structure on a metallic side of the phase diagram is tied to the emergence of quantum criticality.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86682966","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: 3