Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session AA03: V: Quantum Spin Liquids and Chiral Spin Textures and DynamicsFocus
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Sponsoring Units: GMAG Chair: Eleanor Clements, Oak Ridge National Laboratory Room: Virtual Room 3 |
Monday, March 20, 2023 5:00AM - 5:36AM |
AA03.00001: Exploring rare-earth based spin frustrated systems Invited Speaker: Qingming Zhang Rare-earth spin frustrated systems featured by strong spin-orbit coupling are distinctly different from their cousins built on 3d magnetic ions in many aspects. Rare-earth ions output a highly anisotropic magnetism which brings many exotic spin phases including quantum spin liquid, and can act as building blocks for a bond-dependent Kitaev spin system. In this talk, I will briefly introduce two rare-earth based spin frustrated families we revealed in recent years. One is the triangular lattice rare-earth chalcogenide ARECh2 (A=alkali or monovalent ions, RE=rare earth, Ch=chalcogen) which appears as a large family of QSL candidates. The other one is van der Waals layered Kitaev spin system REChX (RE=rare earth, Ch=chalcogen, X=halogen). Our studies show that the two families offer an inspiring platform for exploring spin liquid phases, particularly Kitaev physics and its potential applications. |
Monday, March 20, 2023 5:36AM - 5:48AM |
AA03.00002: The nature of visons in the perturbed ferromagnetic and antiferromagnetic Kitaev honeycomb models Chuan Chen The Kitaev honeycomb model hosts a fascinating fractionalized state of matter featuring emergent Majorana fermions and a vison particle that carries the flux of an emergent gauge field. In the exactly solvable model these visons are static but certain perturbations can induce their motion. We show that the nature of the vison motion induced by a Zeeman field is sharply distinct in the ferromagnetic vs the antiferromagnetic Kitaev models. Namely, in the ferromagnetic model the vison has a trivial non-projective translational symmetry, whereas in the antiferromagnetic Kitaev model it has a projective translational symmetry with π-flux per unit cell. The vison band of the ferromagnetic case has zero Berry curvature, and no associated intrinsic contribution to the thermal Hall effect. In contrast, in the antiferromagnetic case there are two gapped vison bands with opposite Chern numbers and an associated intrinsic vison contribution to the thermal Hall effect. We discuss these findings in light of the physics of the spin liquid candidate α-RuCl3. |
Monday, March 20, 2023 5:48AM - 6:00AM |
AA03.00003: Spin nematic liquid of one-dimensional quantum spin systems in magnetic field Toru Sakai The spin nematic state is one of interesting topics in the field of the condensed matter physics. Most theoretical and numerical studies which predicted the spin nematic order so far were based on the spin frustration or the biquadratic interaction. Now we propose another mechanism of the spin nematic phase based on the easy-axis anisotropy and the external magnetic field. When the magnetic field is applied along the easy-axis anisotropy of conventional antiferromagnets, the spin flop transition with the magnetization jump occurs and the canted Neel order is realized. In some one-dimensional systems, however, instead of this first-order transition, two second-order transitions appear and the two-magnon bound state appears as the intermediate phase[1]. This phase corresponds to the Tomonaga-Luttinger liquid phase where the SDW spin correlation along the magnetic field and the nematic spin correlation perpendicular to the field are quasi-long-range orders. The recent study on several one-dimensional systems using the numerical diagonalization of finite-size clusters and the conformal field theory indicated that the nematic spin correlation dominant region appears at higher external field. The phase diagrams with respect to the easy-axis anisotropy and the magnetization are obtained for the following systems: the S=1/2 spin ladder with the anisotropic ferromagnetic rung coupling[2], the S=1/2 ferromagnetic and antiferromagnetic bond-alternating chain[3], the S=1/2 delta chain, the S=1/2 distorted diamond chain, the S=1 antiferromagnetic chain with the easy-axis anisotropy[4]. The possibility of these spin nematic liquid phase realized in some realistic materials is discussed. |
Monday, March 20, 2023 6:00AM - 6:12AM |
AA03.00004: Transport and thermodynamic properties of the metallic kagome compound Sc3Mn3Al7Si5 Charuni Dissanayake, Kapila Kumarasinghe, Eun S Choi, Yasuyuki Nakajima The two-dimensional corner-sharing kagome lattice offers a significant platform to explore physics in magnetism, topology, and electron correlations. These inherent characteristics of the kagome lattice can induce exotic states of matter, such as quantum spin liquids and flat energy bands. Sc3Mn3Al7Si5 is a metallic compound with a hexagonal structure, in which magnetic Mn atoms form kagome nets [1]. We have synthesized single crystals of Sc3Mn3Al7Si5 and measured magnetotransport and thermodynamic properties at low temperatures. Our transport measurements exhibit no anomaly down to 20 mK, indicating that strong quantum fluctuations persist to the lowest temperatures due to the geometrical frustration in the kagome lattice. We observe a logarithmic increase in resistivity below 20 K, reminiscent of the Kondo effect. The low-temperature resistivity is suppressed by applying fields. Torque magnetometry measurements reveal no sign of a magnetic phase transition or saturation in magnetization up to 35 T at 0.3 K. We will also discuss the nature of strong electronic correlations in kagome metal Sc3Mn3Al7Si5 evident by heat capacity measurements at low temperatures. |
Monday, March 20, 2023 6:12AM - 6:24AM |
AA03.00005: Resonating valence bond states in an electron-phonon system Zhaoyu Han, Steven A Kivelson We study a simple electron-phonon model that describes the effects of the vibration of bond atoms, through an asymptotically exact strong coupling analysis. When the electron-phonon coupling strength exceeds the charge transfer gap between the bond and the site orbitals and in a range of phonon retardation, we controllably obtain the Rokhsar-Kivelson quantum dimer model as the low-energy effective Hamiltonian at the density one electron per site. As varying phonon retardation, on the square lattice, there is a transition between distinct valence bond solids, separated by a solvable quantum critical line characterized by a resonating valence bond state. On the triangular lattice, a stable spin liquid phase occurs with Z2 topological order. |
Monday, March 20, 2023 6:24AM - 6:36AM |
AA03.00006: Phase Diagrams of Spin-S Kitaev Ladders Yushao Chen, Aaron Szasz, Yin-Chen He
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Monday, March 20, 2023 6:36AM - 6:48AM |
AA03.00007: Ultrafast optical generation of antiferromagnetic texture-antitexture pair Sumit Ghosh, Stefan Blügel, Yuriy Mokrousov In this presentation we demonstrate the generation of an antiferromagnetic texture-antitexture pair with the help of an ultrafast laser [1]. We adopt a hybrid quantum-classical evolution scheme which consider both electronic and magnetic system on equal footing and reveals their intertwined dynamics [2]. By analysing the different stages of the dynamics we systematically identify the emergence of topological order in real time. The process does not require any intrinsic spin-orbit coupling or external magnetic field and conserves total topological charge. The texture can survive for 100ps and is fairly robust against scalar impurity. |
Monday, March 20, 2023 6:48AM - 7:00AM |
AA03.00008: DMI measurement in ferrimagnetic Mn4N thin film Wei Zhou Ferrimagnetic Mn4N thin film with perpendicular magnetic anisotropy is a candidate for spintronic devices due to its low magnetization (40-100 emu/cc), high perpendicular anisotropy (7-10 kJ/m3 and large domain wall velocity (~900 m/s). Recently, tunable magnetic skyrmions have been reported in 15nm Mn4N thin films on MgO (100) substrates with CuxPt1-x capping layers, and the interfacial Dzyaloshinskii-Moriya Interaction (DMI) is calculated with density functional theory. Measured DMI is necessary for comprehensively exploring the skyrmions in Mn4N. However, the DMI of the Mn4N system is hard to be measured directly with Brillouin light scattering (BLS) due to its large saturation field(>3T). Here, based on magnetic droplet theory, we report the DMI of MgO/Mn4N(15nm)/CuxPt1-x (x=0, 0.5, 0.9, 1) by extracting the effective field of DMI from angular dependence of anomalous Hall effect. The DMI of the MgO/Mn4N/CuxPt1-x decreases non-linearly as Cu concentration increases. Finally, the possible effect on the DMI of the mixing layer at the surface of Mn4N is discussed. |
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