Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session K51: Quantum Spin Liquid IIFocus Recordings Available

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Sponsoring Units: GMAG DCMP Chair: Ziyan Zhu, Harvard University Room: McCormick Place W474B 
Tuesday, March 15, 2022 3:00PM  3:12PM 
K51.00001: Prediction for a Dirac Spin Liquid in a Rydberg Tweezer Array Marcus Bintz, Vincent S Liu, Johannes Hauschild, Michael P Zaletel, Norman Y Yao A longstanding focus in the study of quantum antiferromagnetism has been the search for quantum spin liquid ground states, which host intricate longrange quantum entanglement and exotic lowenergy excitations. Recently, experiments involving hundreds of strongly interacting, individually trapped Rydberg atoms have become strong contenders for realizing such spin liquids. In this talk, we present our numerical investigation of a longrange antiferromagnetic XY model that naturally arises in tweezer arrays, where the effective spin is encoded in a pair of Rydberg states. Largescale iDMRG calculations reveal the ground state of this model on the kagome lattice to be a gapless Dirac spin liquid. We also discuss the possibility of adiabatically preparing the Dirac spin liquid from a simple paramagnet initial state. 
Tuesday, March 15, 2022 3:12PM  3:24PM 
K51.00002: Probing signatures of spin fractionalization in Quantum Spin Liquid phases via vibrational Raman spectroscopy ARNAB SETH, Subhro Bhattacharjee, Ajay K. Sood, Srishti Pal, Yogesh Singh, D. V. S. Muthu, Piyush Sakrikar, Anzar Ali, Roderich Moessner We study the magnetoelastic coupling in Quantum Spin Liquids(QSL) to explore possible signatures of spin fractionalization. Two concrete realizations are studied: Pr_{2}Zr_{2}O_{7} and Cu_{2}IrO_{3}, candidates for nonKramers U(1) and secondgeneration Kitaev QSL respectively. Renormalization of phonon linewidth and frequency due to the couplings are calculated by studying scattering channels that open up in the lowtemperature QSL phase via fractionalization. In Cu_{2}IrO_{3}, broadening of linewidth shows fermionic temperature evolution as a result of effective Majoranaphonon interaction and its frequency dependence is sensitive to the twoMajorana density of states(DOS). In the case of nonKramers Pr_{2}Zr_{2}O_{7}, a linear spinphonon coupling is derived which is expected to be dominant than the familiar quadratic coupling. Phonon linewidth is calculated for different scattering channels due to magnetic monopoles, electric charges and photons. While its temperature dependence shows the bosonic behavior of the excitations, the frequency dependence follows their twoparticle DOS. Due to the natural separation of the energy scale of three excitations, their spectroscopic signature occurs at different frequency regimes which might be important to characterize the fractionalized excitations experimentally. 
Tuesday, March 15, 2022 3:24PM  3:36PM Withdrawn 
K51.00003: Characterizing the Spin½ Heisenberg model on the triangular lattice through the Dynamical Spin Structure Factor Ta Tang, Thomas P Devereaux, Brian Moritz The ground state phase of the spin1/2 Heisenberg model on the triangular lattice with nearestneighbor exchange J1 can be frustrated by the next nearest neighbor coupling J2. While both small and large values of J2/J1 lead to magnetically ordered phases, a spin liquid phase with short correlation length can be established at intermediate values. However, the nature of this spin liquid phase remains under debate, with finite size DMRG calculations suggesting a gapped Z2 spin liquid phase, but also showing possible gapless spinon excitations. Here, we use exact diagonalization on a series of finitesize clusters to analyze the character of the ground state and lowestlying excited states of the model for various values of J2. We further characterize the evolution of the model as a function of J2 by analyzing the dynamical spin structure factor S(q,w) to provide key information on changes of the underlying magnetic structure. 
Tuesday, March 15, 2022 3:36PM  4:12PM 
K51.00004: Magnetic Frustration and Quantum Disorder in J_{eff} = 1/2 LanthanideBased ALnX_{2} Materials Invited Speaker: Mitchell Bordelon Magnetic frustration is a generous source of phases of matter with unusual physical properties where magnetic order is dictated by the interdependence of local electronic states and their realspace interactions. These local states can compete to drive differing magnetic phases that range from typical collinear (anti)ferromagnets to more exotic highlyentangled ground states with emergent phenomena. Typically, these entangled phases are sought after in materials comprised of small spin 1/2 moments decorating lattice geometries inciting multiple equivalent interactions. These small moments can form from crystalline electric field interactions splitting a total angular momentum manifold of a Kramers’ magnetic ion producing an effectively small J_{eff} = 1/2 moment at low temperature. 
Tuesday, March 15, 2022 4:12PM  4:24PM 
K51.00005: Dynamics of a tunable QED in quantum spin ice Kehang Zhu, Siddhardh C Morampudi, Yeqi Huang, Youjin Deng, Frank Wilczek Quantum spin ice is a spin liquid which realizes an emergent quantum electrodynamics with tunable values of couplings like the speed of light and finestructure constant. Using largescale quantum Monte Carlo simulations, we show that these tunable couplings have direct consequences in experimental observables such as the static and dynamic structure factors measured through neutron scattering. This leads to the possibility of extracting all the couplings of the emergent QED from experimental measurements in possible realizations, while also indicating quantum spin ice as an ideal platform for a quantum simulation of a tunable quantum electrodynamics. 
Tuesday, March 15, 2022 4:24PM  4:36PM 
K51.00006: Thermal conductivity of the kagome antiferromagnet herbertsmithite Etienne Lefrancois, Quentin Barthélemy, Patrick BourgeoisHope, Jordan Baglo, Pierre Lefloïc, Dipranjan Chatterjee, Victor Balédent, Matias Velàzquez, Fabrice Bert, Philippe Mendels, Nicolas DoironLeyraud, Louis Taillefer As a close realization of the S = 1/2 kagome Heisenberg antiferromagnet, herbertsmithite (ZnCu_{3}(OH)_{6}Cl_{2}) is an emblematic quantum spin liquid candidate. We have measured the thermal conductivity of several protonated and deuterated single crystals of herbertsmithite, over a wide range of temperature (0.05 – 120 K) and magnetic field (0 – 15 T). 
Tuesday, March 15, 2022 4:36PM  4:48PM 
K51.00007: Detecting symmetry fractionalization by magnetic impurities Shuangyuan Lu, Biao Huang, YuanMing Lu Experimental detection of quantum spin liquids (QSLs) and the phenomena of symmetry fractionalization therein has been a longlasting problem. We study the Kondo problem of a magnetic impurity coupled to a gapped Z2 QSL with crystal symmetries. Remarkably, when the spinon excitations in the QSL exhibit certain nontrivial class of crystal symmetry fractionalization, there will be a nonKramers doublet protected by crystal symmetries even when the impurity is Kondo screened by the QSL. We demonstrate this unconventional Kondo effect by exact solvable model and largeN calculations. This points to a new way to detect symmetry fractionalization in QSL materials. 
Tuesday, March 15, 2022 4:48PM  5:00PM 
K51.00008: Probing Emergent Excitations in Pr_{2}Hf_{2}O_{7} with Thermal Conductivity Jennifer Reid Pr_{2}Hf_{2}O_{7} (PHO) is a quantum spin ice candidate with a nonKramers doublet ground state that displays evidence of dynamic spin ice behaviour [1][2]. We report thermal conductivity measurements of single crystal samples of PHO as a function of temperature between 50 mK and 50 K and magnetic field up to 12 T. A combination of high magnetic field measurements and measurements of different sized samples are used to identify the lattice contribution. We interpret our results considering current theoretical predictions for exotic excitations in quantum spin liquids, such as emergent photons, magnetic monopoles and visons [3]. 
Tuesday, March 15, 2022 5:00PM  5:12PM 
K51.00009: Exceptional dynamics of interacting spin liquids Daniel Varjas, Kang Yang, Emil J Bergholtz, Siddhardh C Morampudi Quantum spin liquids are emergent gauge theories with associated fractionalized excitations and emergent gauge fields. A prominent open question is how a spin liquid is sharply characterized in experiments, with traditional approaches focusing on meanfield theory. 
Tuesday, March 15, 2022 5:12PM  5:24PM 
K51.00010: Spinnernst effect in the disordered phase of an antiferromagnet: A Schwinger boson meanfield study Venkata Lokesh Kumar Yandoti, Prasad Hegde We study the topological properties and symmetry constraints of spinon bands in the disordered state of an antiferromegnetic insulator. Time reversal symmetry breaking can give rise to spinon bands with nonvanishing berry curvature. Under appropriate lattice symmetries, the spinons of opposite polarity flow in opposite transverse direction in response to a longitudinal temperature gradient. Within Schingerboson meanfield theory, we theoretically study the temperature dependenece of this spinon hall current. 
Tuesday, March 15, 2022 5:24PM  5:36PM 
K51.00011: Deconfinementconfinement transition induced by chemical disorder in quantum spin ice HyeokJun Yang, EunGook Moon, SungBin Lee Spin ice is a cooperative paramagnet featuring a emergent U(1) gauge structure and fractionalized excitations. In particular, the spin structure in the Coulomb phases have been analytically understood based on the largeN approximation for Ising (N = 1) and Heisenberg (N = 3) spins. Nevertheless, its validity and the physical effects towards smearing out of the Coulomb nature requires better understanding. Here, we employ the Abelian duality transformation to explore the nonperturbative effects for N = 1. It turns out that the substantial doping in the Ising spin ice brings about the deconfinementconfinement transition. As a consequence of the nonlinear mode coupling imposed by the spin length condition, there is a sharp phase transition to confined phase with disorder. We also discuss the implication of this critical point to the spin structure. 
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