Article
Multidisciplinary Sciences
X. Rao, G. Hussain, Q. Huang, W. J. Chu, N. Li, X. Zhao, Z. Dun, E. S. Choi, T. Asaba, L. Chen, L. Li, X. Y. Yue, N. N. Wang, J. -G. Cheng, Y. H. Gao, Y. Shen, J. Zhao, G. Chen, H. D. Zhou, X. F. Sun
Summary: Experimental results strongly suggest the survival of the quantum spin liquid state in YbMgGaO4 despite material disorder, shedding light on the impact of disorder on the true magnetic ground state of quantum spin liquid candidates.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Muwei Wu, Dao-Xin Yao, Han-Qing Wu
Summary: Using exact diagonalization, this study systematically investigates the anisotropic Heisenberg model related to rare-earth triangular-lattice materials, revealing a large region of quantum spin liquid phase and analyzing the magnetization curves and characteristics of random-singlet phase.
Article
Materials Science, Multidisciplinary
Zhen Ma, Zhao-Yang Dong, Jinghui Wang, Shuhan Zheng, Kejing Ran, Song Bao, Zhengwei Cai, Yanyan Shangguan, Wei Wang, M. Boehm, P. Steffens, L. -P. Regnault, Xiao Wang, Yixi Su, Shun-Li Yu, Jun-Ming Liu, Jian-Xin Li, Jinsheng Wen
Summary: The study explores the disorder effect in quantum spin liquids by investigating the magnetic-field dependence of low-energy magnetic excitations in a triangular-lattice frustrated magnet. The results demonstrate the critical role of disorder in broadening the magnetic excitation spectra and mimicking the spin-liquid features in frustrated quantum magnets.
Article
Multidisciplinary Sciences
Pyeongjae Park, Kisoo Park, Joosung Oh, Ki Hoon Lee, Jonathan C. Leiner, Hasung Sim, Taehun Kim, Jaehong Jeong, Kirrily C. Rule, Kazuya Kamazawa, Kazuki Iida, T. G. Perring, Hyungje Woo, S-W Cheong, M. E. Zhitomirsky, A. L. Chernyshev, Je-Geun Park
Summary: The study discusses novel effects induced by nonmagnetic impurities in frustrated magnets and quantum spin liquid, as well as the theoretical proposal of extended modulated spin structures. Experimental confirmation of impurity-induced spin textures in noncollinear magnetic order has been provided, showing that nonmagnetic impurities can produce extended spin structures in certain magnets.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Hui-Ke Jin, Johannes Knolle, Michael Knap
Summary: We study a driven Kitaev honeycomb model and analyze the dynamics of emergent Majorana matter and Z2 flux excitations. We find a distinct two-step heating process, known as fractionalized prethermalization, and a quasi-stationary state with significantly different temperatures for the matter and flux sectors. We argue that this unique prethermalization behavior is a consequence of fractionalization. In addition, we propose an experimentally feasible protocol for preparing a low energy density zero-flux initial state of the Kiteav honeycomb model, which can be used to observe fractionalized prethermalization in quantum information processing platforms.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
J. M. Ni, Y. Y. Huang, E. J. Cheng, Y. J. Yu, B. L. Pan, Q. Li, L. M. Xu, Z. M. Tian, S. Y. Li
Summary: Spin liquids are exotic states with highly entangled and fluctuating spins in frustrated systems, and they do not exhibit spontaneous symmetry breaking down to zero temperature. Excitations like magnetic monopoles, visons, and photons may emerge from quantum spin ice states, which are a special type of spin liquids found in pyrochlore lattices. The insulating nature of spin liquids is challenged by the metallic spin liquid Pr2Ir2O7, located at a zero-field quantum critical point. Thermal conductivity measurements on Pr2Ir2O7 reveal the absence of breakdown of Landau quasiparticles at the quantum critical point and the lack of mobile fermionic excitations, which helps constrain the description of quantum criticality in this material. Surprisingly, while the specific heats show anisotropy with respect to magnetic field directions, the thermal conductivities exhibit a giant but isotropic response, suggesting the importance of quadrupolar interactions and quantum fluctuations in determining the true ground state of the material.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Srishti Pal, Vinod Kumar, Debendra Prasad Panda, A. Sundaresan, Avinash V. Mahajan, D. V. S. Muthu, A. K. Sood
Summary: This study reports the low-temperature Raman signatures of Ag3LiIr2O6, a honey-comb magnet that is a candidate for Kitaev quantum spin liquid. Evidence of fractionalization of emergent elementary excitation and coupling between vibrational and Majorana fermionic excitations are observed in the temperature evolution of the magnetic continuum and low-frequency phonon mode.
Article
Materials Science, Multidisciplinary
A. V. Shchepetilnikov, A. R. Khisameeva, Yu. A. Nefyodov, I. V. Kukushkin
Summary: The study found that even near full filling factors of the integer quantum Hall effect, electron spin resonance still existed even at large electron densities, and the ESR amplitude was comparable between even and odd fillings. This anomalous behavior suggests substantial spin polarization of even fillings, and was observed in AlAs quantum wells and ZnO/MgZnO heterojunctions.
Article
Materials Science, Multidisciplinary
Vivek Kumar, Deepu Kumar, Birender Singh, Yuliia Shemerliuk, Mahdi Behnami, Bernd Buechner, Saicharan Aswartham, Pradeep Kumar
Summary: The existence of a quantum spin liquid (QSL) state is still not experimentally confirmed, but can be indirectly observed through certain experimental signatures. In the study of V1-xPS3 single crystals using inelastic light scattering (Raman), evidence of spin fractionalization into Majorana fermions within the paramagnetic phase was found. This was reflected in the emergence of a low-frequency quasielastic response and a broad magnetic continuum, indicating a crossover from a pure paramagnetic state to a fractionalized spin regime. Anomalies in the phonons' self-energy parameters, such as line broadening and line asymmetry, were observed at this crossover temperature, suggesting the decaying of phonons into itinerant Majorana fermions and indicating a phase proximate to the quantum spin liquid state in this quasi-two-dimensional magnetic system.
Article
Materials Science, Multidisciplinary
Hodaka Kikuchi, Shinichiro Asai, Hirotaka Manaka, Masato Hagihala, Shinichi Itoh, Takatsugu Masuda
Summary: We conducted inelastic neutron scattering experiments to investigate the spin dynamics of CsCrF4, a potential spin tube material. The compound undergoes a phase transition from a paramagnetic phase to an intermediate-temperature phase and finally to a low-temperature phase. By comparing observed and calculated neutron spectra, we identified the spin Hamiltonian as antiferromagnetic spin tubes with perturbative terms. The phase diagram for the ground state was calculated and the spin Hamiltonian parameters obtained from the low-temperature phase spectra were close to the boundary of the intermediate-temperature phase.
Article
Materials Science, Multidisciplinary
S. Lee, S. -H. Do, W. Lee, Y. S. Choi, J. van Tol, A. P. Reyes, D. Gorbunov, W. -T. Chen, K. -Y. Choi
Summary: By manipulating bond alternation and disorder, a magnetic ground state was tuned in the Cr-based breathing pyrochlore system, leading to the experimental observation of a spin-liquid-like state.
NPJ QUANTUM MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
P. Prelovsek, M. Gomilsek, T. Arh, A. Zorko
Summary: This study presents an in-depth analysis of temperature-dependent dynamical spin correlations in the antiferromagnetic Heisenberg spin-1/2 model on the kagome lattice with additional interactions. The research shows that introducing additional interactions leads to an anisotropic dynamical response and affects the in-plane spin fluctuations, ultimately leading to the onset of a coplanar AFM ground state order. The results are in good agreement with experimental data on kagome AFM compounds, demonstrating the importance of dynamical spin correlations in understanding quantum spin liquids.
Article
Materials Science, Multidisciplinary
Francesco Ferrari, Roser Valenti, Federico Becca
Summary: The existence and stability of spin-liquid phases are key topics in the field of frustrated magnetism, with recent investigations suggesting their possible appearance in Heisenberg-like models on frustrated lattices. The effect of spin-phonon coupling on frustrated magnetism models and the stability of gapless spin liquids under small perturbations are important research areas. The results demonstrate the potential realization of gapless spin liquids in real materials, highlighting the importance of understanding the interaction between spins and phonons in frustrated magnetism systems.
Article
Materials Science, Multidisciplinary
Aaron Szasz, Chong Wang, Yin -Chen He
Summary: In this study, a highly frustrated spin-1 model on the triangular lattice is investigated, and several magnetically ordered phases and spin nematic phases are identified using the density matrix renormalization group technique.
Article
Materials Science, Multidisciplinary
P. Eibisch, C. Thurn, Y. Saito, S. Hartmann, U. Tutsch, B. Wolf, A. T. M. Nazmul Islam, S. Chillal, A. R. N. Hanna, B. Lake, M. Lang
Summary: This study presents the measurement results of thermodynamic, magnetic, and dielectric properties of single-crystalline PbCuTe2O6 at low temperatures and different magnetic fields. The combination of these measurements allows for the construction of a detailed B-T phase diagram, revealing the presence of ferroelectric and magnetic phases as well as transitions between them.
Article
Optics
Jinpeng Yuan, Hengfei Zhang, Chaohua Wu, Gang Chen, Lirong Wang, Liantuan Xiao, Suotang Jia
Summary: In this study, the generation of 1D and 2D vortex-beam arrays is proposed and demonstrated using forked-photonic lattices in a three-level Rb-85 atomic medium. The input Gaussian probe beam experiences phase superposition and is diffracted into vortex-beam arrays. The efficiency of high-order diffractions can be enhanced by tuning the two-photon detuning and power of the coupling beams. The experimental results agree well with numerical simulations, suggesting that atomic systems are a fertile platform for creating and controlling vortex-beam arrays.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Applied
Chun-Jiong Huang, Xiaoqun Wang, Ziqiang Wang, Gang Chen
Summary: This study explores the effects of quenched disorders and interlayer coupling in a triangular lattice Ising antiferromagnet. It is found that weak quenched disorder converts the 2D BKT phase into a U(1) gauge glass, accompanied by a Halperin-Saslow mode. Ferromagnetic interlayer coupling suppresses the BKT phase and generates a small ferromagnetism.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Physics, Multidisciplinary
Yaodong Li, Yijian Zou, Paolo Glorioso, Ehud Altman, Matthew P. A. Fisher
Summary: We investigate the use of linear cross entropy as an order parameter to distinguish different phases in measurement-induced phase transitions. Our study shows that for circuits with Clifford gates, the linear cross entropy can be accurately sampled from a quantum simulator without postselection. We also find that the signature of measurement-induced phase transitions can still be observed for intermediate system sizes.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Y. Shen, J. Sears, G. Fabbris, J. Li, J. Pelliciari, M. Mitrano, W. He, Junji Zhang, J. F. Mitchell, V. Bisogni, M. R. Norman, S. Johnston, M. P. M. Dean
Summary: Charge order is a common phenomenon in both cuprate superconductors and low-valence nickelate superconductors, but their electronic characteristics differ. In this study, using resonant inelastic x-ray scattering, researchers identified the involvement of Ni 3dx2-y2, 3d3z2-r2, and O 2p sigma orbitals in the formation of diagonal charge order in an overdoped low-valence nickelate. The results reveal that the low-energy physics and ground-state character of these nickelates are more complex than those in cuprates.
Article
Multidisciplinary Sciences
G. Fabbris, D. Meyers, Y. Shen, V. Bisogni, J. Zhang, J. F. Mitchell, M. R. Norman, S. Johnston, J. Feng, G. S. Chiuzbaian, A. Nicolaou, N. Jaouen, M. P. M. Dean
Summary: Ruddlesden-Popper and reduced Ruddlesden-Popper nickelates are potential substitutes for high-temperature superconducting cuprates, but the extent of their similarity has been contested. Resonant inelastic x-ray scattering (RIXS) has been crucial in studying their electronic and magnetic excitations, but inconsistent results among different samples and the absence of publicly available data have hindered detailed comparisons. To address this, we present open RIXS data on La4Ni3O10 and La4Ni3O8.
Article
Materials Science, Multidisciplinary
Xiao-Tian Zhang, Gang Chen
Summary: We study a unique type of non-Fermi liquid that has an infinite number of critical bosonic modes instead of a finite number of bosonic modes, unlike the conventional ones. We examine itinerant magnets with both conduction electrons and fluctuating magnetic moments in three dimensions. Due to the Dzyaloshinskii-Moriya interaction, the moments fluctuate near a boson surface in the reciprocal space at low energies as the system approaches an ordering transition. The infinite number of critical modes on the boson surface strongly scatter the gapless electrons on the Fermi surface, resulting in the conversion of the metallic sector into a non-Fermi liquid. We explain the physical properties of this non-Fermi liquid. On the ordered side, a conventional non-Fermi liquid emerges due to the scattering by the gapless Goldstone mode resulting from the spontaneous breaking of the global rotational symmetry. We discuss the general structure of the phase diagram near the quantum phase transition and clarify various crossover behaviors.
NPJ QUANTUM MATERIALS
(2023)
Article
Physics, Multidisciplinary
Gang Chen
Summary: Explored the characteristics of the Coulombic antiferromagnet in spin-1/2 pyrochlores, which exhibits both antiferromagnetic order and emergent quantum electrodynamics. This exotic state has characteristics such as a gapless gauge photon and fractionalized quasiparticles, leading to anomalously large T3 specific heat and a broad spinon continuum. Discussed the relevance of this work to experimental and material studies, and highlighted the potential for uncovering exotic physics in ordered magnets.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Lorenzo Piroli, Yaodong Li, Romain Vasseur, Adam Nahum
Summary: We study quantum circuits and analyze the transitions that occur as the rate of control operations is increased. We show that the measurement-induced entanglement transition and the directed percolation transition into the absorbing state are distinct. By introducing effective tensor networks, we analyze the entanglement and absorbing-state transitions.
Article
Materials Science, Multidisciplinary
Shuangkui Guang, Na Li, Rui Leonard Luo, Qing Huang, Yiyan Wang, Xiaoyue Yue, Ke Xia, Qiuju Li, Xia Zhao, Gang Chen, Haidong Zhou, Xuefeng Sun
Summary: We conducted a study on the in-plane thermal transport of Na2Co2TeO6, a honeycomb Kitaev material, at sub-Kelvin temperatures. In zero magnetic field, the thermal conductivity kappa(T) showed weak temperature dependence but had a non-zero residual term kappa 0/T, suggesting strong phonon scattering due to magnetic excitation and the coexistence of itinerant spinonlike excitations with antiferromagnetic order. We proposed that the ground state under zero magnetic field is a fractionalized antiferromagnetic (AF*) state with both magnetic order and fractionalized excitations. Furthermore, we observed two sharp minima in the kappa a*(B) at 7.5 and 10 T when the heat current and magnetic field were along the a* (Co-Co bond) direction, confirming the phase boundaries of the reported field-induced intermediate state. No such intermediate phase was found in the kappa a(B) for the current and field along the a (zigzag chain) direction. Lastly, Na2Co2TeO6 exhibited a strongly anisotropic magneto-thermal conductivity as the in-plane (out-of-plane) field significantly enhanced (suppressed) kappa a* and kappa a.
Article
Materials Science, Multidisciplinary
Zhenxing Cui, Mian Peng, Xuewei Zhang, Qiang Wei, Mou Yan, Gang Chen
Summary: In this paper, the authors experimentally observe the existence of multiple acoustic topological boundary states in four band gaps, including end states in one-dimensional phononic crystals and corner states in two-dimensional phononic crystals, based on acoustic quartic-root topological insulators. These boundary states originate from two consecutive square-root procedures, similar to square-root topological insulators. The paper provides a simple approach to achieve multiple boundary states by inserting additional cavities, without the need for elaborate structure designing, making acoustic manipulation more flexible.
Article
Materials Science, Multidisciplinary
M. R. Norman, A. S. Botana, J. Karp, A. Hampel, H. LaBollita, A. J. Millis, G. Fabbris, Y. Shen, M. P. M. Dean
Summary: This paper presents a simple formalism for calculating x-ray absorption and resonant inelastic x-ray scattering, which uses the density of states as input from a single-particle or many-body ab initio calculation and is designed to capture itinerant like features. The formalism is applied to calculate XAS and RIXS for reduced valence nickelates, cuprate, and unreduced nickelate compounds. The results show strong orbital polarization in reduced valence nickelates and reproduce key aspects of a recent RIXS experiment for R4Ni3O8. Implications for the nature of 3d electrons in reduced valence nickelates are discussed.
Article
Materials Science, Multidisciplinary
J. Sears, Y. Shen, M. J. Krogstad, H. Miao, E. S. Bozin, I. K. Robinson, G. D. Gu, R. Osborn, S. Rosenkranz, J. M. Tranquada, M. P. M. Dean
Summary: The interaction between charge density wave (CDW) and lattice plays a crucial role in La1.875Ba0.125CuO4, inducing periodic modulation of Cu-Cu spacing within the CuO2 planes and out-of-plane breathing modulation of lanthanum layers. The CDW-related structural distortions propagate through the crystal, leading to overlapping structural modulations in adjacent layers and within the same layer. This effect could facilitate the coupling of CDWs between adjacent planes.
Article
Materials Science, Multidisciplinary
Gaofeng Ding, Hongliang Wo, Rui Leonard Luo, Yimeng Gu, Yiqing Gu, Robert Bewley, Gang Chen, Jun Zhao
Summary: We report the experimental results of thermodynamic and neutron scattering measurements on the rare-earth triangular-lattice chalcogenide KErSe2. We observed a long-range stripe order below 0.2 K. Despite being three-dimensional, the magnetic excitations showed minimal modulation along the z direction, indicating weak interlayer coupling. Furthermore, the magnetic excitations developed a well-defined spin-wave dispersion with a gap of approximately 0.03 meV at the M points. Both the stripe order and spin-wave excitations can be quantitatively understood from the anisotropic spin interactions of the Er3+ Kramers doublets.
Article
Optics
Yuanwei Zhang, Gang Chen
Summary: In this study, we investigate the nonlinear effects in a Floquet-driven optomechanical system with quadratic coupling. We establish an effective time-dependent model when the periodically modulated driving field is strong. By using the Keldysh approach, we calculate the retarded Green's function to analyze the system's response to external probing. The results show the occurrence of a transparency window when the nth sideband of a probe field meets the condition of two-phonon resonance. Moreover, abnormal behaviors of the output field, not observed in standard optomechanical models, are discovered. These findings offer a promising platform for controlling light propagation and manipulation, which have potential applications in quantum precision measurement techniques.
Article
Materials Science, Multidisciplinary
Xiaofan Zhou, Jian-Song Pan, Suotang Jia
Summary: We investigated the many-body topological physics of interacting fermions in an extended Su-Schrieffer-Heeger (SSH) model using the density-matrix renormalization-group numerical method. The interaction-driven phase transition from the topological insulator phase to the charge density wave (CDW) phase was identified by analyzing various properties. The global phase diagram was mapped, showing nontrivial topological insulator, trivial insulator, and CDW phases. The phase transitions between the CDW phase and topologically trivial or nontrivial phases were found to be continuous, contrary to the first-order phase transitions in the interacting SSH model. The phase diagram of the interacting spinful SSH4 model with attractive or repulsive on-site spin interaction was also presented.
