Article
Physics, Multidisciplinary
Yi-Fan Jiang, Hong Yao, Fan Yang
Summary: In this Letter, a new class of variational states for the doped t-J model on the Kagome lattice is proposed and investigated through large-scale variational Monte Carlo simulation. The resulting chiral noncentrosymmetric nematic superconducting state is found to possess a finite Fermi surface for Bogoliubov quasiparticles. The experimental properties of this intriguing pairing state are further studied.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Joshuah T. Heath, Faranak Bahrami, Sangyun Lee, Roman Movshovich, Xiao Chen, Fazel Tafti, Kevin Bedell
Summary: In this study, the authors use the analytical paradigm of Landau-Fermi liquid theory to identify thermodynamic features of itinerant Majorana fermions and compare them with experimental data from the Kitaev spin liquid candidate Ag3LiIr2O6. Their findings provide strong evidence for a Fermi liquid-like ground state and open up new avenues for detecting itinerant Majorana fermions in condensed matter systems.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Alexandros Metavitsiadis, Wolfram Brenig
Summary: The study focuses on the self-localization and possible delocalization mechanisms of the Kitaev spin-1/2 ladder model. It is found that the influence of magnetic fields on the system is achieved through flux mobility, with flux mobility being the key to entering a delocalized state.
Article
Materials Science, Multidisciplinary
Kexin Feng, Aysel Shiralieva, Natalia B. Perkins
Summary: It has been found that phonon dynamics can serve as an indirect probe of spin fractionalization, and sound attenuation measurements can be used to characterize and identify the Kitaev quantum spin liquid. On the hyperhoneycomb lattice, sound attenuation exhibits a characteristic angular dependence.
Article
Physics, Multidisciplinary
Hong-Chen Jiang, Steven A. Kivelson
Summary: In a t-J model with small hole doping and frustration, power-law superconducting correlations and exponentially decreasing spin-spin correlations were observed, suggesting a smooth evolution from the insulating parent state. The presence of frustration led to a strong diverging superconducting susceptibility as the temperature approached zero.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Kifu Kurokawa, Shunsuke Isono, Yoshimitsu Kohama, So Kunisada, Shiro Sakai, Ryotaro Sekine, Makoto Okubo, Matthew. D. D. Watson, Timur. K. K. Kim, Cephise Cacho, Shik Shin, Takami Tohyama, Kazuyasu Tokiwa, Takeshi Kondo
Summary: By studying the inner CuO2 planes of a six-layered compound, the authors find that even the slightest amount of carriers can turn a Mott insulating state into a metallic state with long-lived quasiparticles. Furthermore, they observe a phase transition from the superconducting to the metallic states at 4% doping.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
E. Lefrancois, G. Grissonnanche, J. Baglo, P. Lampen-Kelley, J. -Q. Yan, C. Balz, D. Mandrus, S. E. Nagler, S. Kim, Young-June Kim, N. Doiron-Leyraud, Louis Taillefer
Summary: RuCl3 undergoes a transition to a state with antiferromagnetic order below a temperature of about 7 K, but this order can be suppressed by applying an external magnetic field. The existence of a quantum spin liquid phase just above a certain magnetic field is still uncertain, but recent observations suggest the presence of itinerant Majorana fermions.
Article
Physics, Multidisciplinary
Wen-Han Kao, Johannes Knolle, Gabor B. Halasz, Roderich Moessner, Natalia B. Perkins
Summary: In this study, the introduction of random vacancies in the Kitaev model is shown to lead to a power-law upturn in specific heat measurements of H3LiIr2O6, and new insights into the system's response are proposed. The origin and nature of vacancies have minimal impact on the significant accumulation of low-energy Majorana modes, which can be readily detected.
Article
Materials Science, Multidisciplinary
Emily Z. Zhang, Reja H. Wilke, Yong Baek Kim
Summary: There has been significant interest in finding a Kitaev quantum spin liquid state in magnets with bond-dependent interactions. The observation of a half-quantized thermal Hall conductivity in alpha-RuCl3 in the presence of a magnetic field has generated excitement as it could indicate a field-induced chiral spin liquid. However, recent experiments propose a different interpretation, suggesting that topological magnons in the field-polarized state are responsible for the nonquantized thermal Hall conductivity. In this work, three theoretical models with large Kitaev interactions are used to analyze the crossover behavior between the spin excitation continuum and topological magnons at finite temperature.
Article
Physics, Multidisciplinary
Wen-Han Kao, Natalia B. Perkins
Summary: This study explores the response of the Kitaev QSL to various forms of disorder, revealing that quenched disorder can lead to Anderson localization of Majorana fermions and the appearance of Lifshitz tails. Disorder effects on low-energy Majorana fermion modes can be detected in thermal transport, with Z2 fluxes becoming thermally excited at finite temperatures, dominating as a source of disorder at high temperatures. The energy spectrum and thermal transport properties of disordered Kitaev QSL strongly depend on the character of disorder, with site disorder and bond randomness suppressing longitudinal thermal conductivity while low-energy localization is stronger with site disorder.
Article
Multidisciplinary Sciences
Kyusung Hwang, Ara Go, Ji Heon Seong, Takasada Shibauchi, Eun-Gook Moon
Summary: This paper proposes a concrete way to identify the non-abelian Kitaev quantum spin liquid by magnetic field angle dependence, providing criteria for such a state for future experiments.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Su-Ming Zhang, Zheng-Xin Liu
Summary: In extended Kitaev models on the honeycomb lattice, doping holes into the system results in a rich phase diagram of the t-K-Gamma-Gamma' model, showing the interplay between charge and spin degrees of freedom. Multiple superconducting and pseudogap phases are generated, with a Chern number of the topological superconductor being either v = +/- 2 or v = +/- 1. The presence of an intermediate in-plane magnetic field slightly enlarges the topological superconducting phase.
Article
Materials Science, Multidisciplinary
Chanhyeon Lee, Suheon Lee, Youngsu Choi, C. Wang, H. Luetkens, T. Shiroka, Zeehoon Jang, Young-Gui Yoon, Kwang-Yong Choi
Summary: We used various measurements, including magnetic susceptibility, muon-spin relaxation, and nuclear magnetic resonance, to study the spin dynamics of the quantum spin liquid candidate H3LiIr2O6. We identified two characteristic temperatures, Tg = 110 K and T* = 26 K, through analysis of the relaxation rates. Below Tg, there were distinct components of slower relaxation rate governed by gapped excitations and faster relaxation rate related to gapless excitations. We observed divergent magnetic susceptibility, power-law dependence of relaxation rate on temperature, and weakly activated behavior, indicating the coexistence of a disordered spin-liquid state and spin singlets with distributed gaps.
Article
Multidisciplinary Sciences
Ruwan Senaratne, Danyel Cavazos-Cavazos, Sheng Wang, Feng He, Ya-Ting Chang, Aashish Kafle, Han Pu, Xi-Wen Guan, Randall G. Hulet
Summary: Confining ultracold atoms to periodic potentials is a powerful method for simulating complex many-body systems. In this study, we confined fermions to one dimension to realize the Tomonaga-Luttinger liquid model and observed a velocity shift of spin and charge excitations in opposite directions, indicating the existence of spin-charge separation.
Article
Materials Science, Multidisciplinary
Wang Yang, Alberto Nocera, Erik S. Sorensen, Hae-Young Kee, Ian Affleck
Summary: A minimal Kitaev-Gamma model has been studied to uncover new phases and understand symmetry breaking phenomena. Two new phases, including a rank-1 ordered phase with symmetry breaking, were identified near the antiferromagnetic Kitaev point. Numerical observations showed a two-step symmetry breaking process as the length scale increased, highlighting the complexity of phase transitions in the parameter region.
Article
Chemistry, Multidisciplinary
Junshu Chen, Liang Zhou, Linjing Wang, Zijun Yan, Xintan Deng, Jinming Zhou, Jia-wei Mei, Yang Qiu, Bin Xi, Xuesen Wang, Hongtao He, Gan Wang
Summary: The conformal growth of a high-quality ferromagnet on the nanostructures of a topological insulator was realized. A large topological Hall effect was observed, providing evidence for the existence of magnetic spin textures. Atomic structure characterizations revealed embedded nanosheets that can stimulate the generation of magnetic skyrmions.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
H. Ge, L. Zhang, N. Zhao, J. Yang, L. Wang, L. Zhou, Y. Fu, T. T. Li, Z. M. Song, F. Ding, J. B. Xu, Y. F. Zhang, S. M. Wang, J. W. Mei, X. Tong, P. Miao, H. He, Q. Zhang, L. S. Wu, J. M. Sheng
Summary: In this study, a new rare-earth-based one-dimensional Ising spin chain magnet DyNi5Ge3 was investigated using magnetization, specific heat, and powder neutron diffraction measurements. Two successive antiferromagnetic phase transitions were found at 6 K and 5 K, with Dy ions forming canted magnetic sublattices. Neutron diffraction experiments identified an incommensurate magnetic propagation vector and confirmed that the Ising spins are canted in the crystal plane.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Multidisciplinary
Yuanhao Dong, Ying Fu, Yixuan Liu, Zhanyang Hao, Le Wang, Cai Liu, Ke Deng, Jiawei Mei
Summary: We successfully grew and characterized a Li9Cr3(P2O7)(3)(PO4)(2) single crystal, and investigated its magnetic properties under external magnetic fields. Our study revealed that Li9Cr3(P2O7)(3)(PO4)(2) is an easy-plane kagome ferromagnet with S = 3/2. Under zero magnetic field, it undergoes a magnetic transition from a paramagnetic state to a ferromagnetically ordered state at T (C) = 2.7 K. By applying a c-axis directional magnetic field, we observed a reduction in the magnetic transition temperature.
Article
Physics, Multidisciplinary
Chengcheng Zhang, Yuan Wang, Fayuan Zhang, Hongtao Rong, Yongqing Cai, Le Wang, Xiao-Ming Ma, Shu Guo, Zhongjia Chen, Yanan Wang, Zhicheng Jiang, Yichen Yang, Zhengtai Liu, Mao Ye, Junhao Lin, Jiawei Mei, Zhanyang Hao, Zijuan Xie, Chaoyu Chen
Summary: Rare earth antiferromagnet GdAuAl4Ge2 is a candidate material for magnetic topological metal, with nontrivial Z (2) topology and strong termination dependence of surface bands. Further study is needed to investigate its magnetic structure, magnetic topology state, transport behavior, and microscopic properties.
Article
Physics, Multidisciplinary
Yu Zhang, Jiawei Mei, Weiqiang Chen
Summary: The one-band t-J model captures strong correlations in cuprate high-temperature superconductors, including the intertwined spin and charge orders as well as superconductivity. By simulating the t-J model on a six-leg lattice with a small J case (t/J = 10), we find the absence of superconductivity and enhanced intertwined spin and charge orders. In addition to the stripe phases, a new SDW + CDW phase with a (pi, pi) antiferromagnetism spin modulation and shorter wavelength of charge modulation is observed.
CHINESE PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Yuan Wang, Yixuan Liu, Zhanyang Hao, Wenjing Cheng, Junze Deng, Yuxin Wang, Yuhao Gu, Xiao-Ming Ma, Hongtao Rong, Fayuan Zhang, Shu Guo, Chengcheng Zhang, Zhicheng Jiang, Yichen Yang, Wanling Liu, Qi Jiang, Zhengtai Liu, Mao Ye, Dawei Shen, Yi Liu, Shengtao Cui, Le Wang, Cai Liu, Junhao Lin, Ying Liu, Yongqing Cai, Jinlong Zhu, Chaoyu Chen, Jia-Wei Mei
Summary: We report a titanium-based kagome metal CsTi3Bi5, where titanium atoms form a kagome network as in its isostructural compound CsV3Sb5. The thermodynamic properties reveal the conventional Fermi liquid behavior and no signature of superconducting or charge density wave (CDW) transition anomaly down to 85 mK. The angle-resolved photoemission spectroscopy measurements show multiple bands crossing the Fermi level, with a direct observation of the flat band formed by the destructive interference of hopping in the kagome lattice. The absence of CDW is consistent with the van Hove singularities pushed far away above the Fermi level in CsTi3Bi5, and the first-principles calculations confirm the nontrivial DOUBLE-STRUCK CAPITAL Z(2) topological properties for the bands crossing the Fermi level.
CHINESE PHYSICS LETTERS
(2023)
Correction
Physics, Multidisciplinary
Yuan Wang, Yixuan Liu, Zhanyang Hao, Wenjing Cheng, Junze Deng, Yuxin Wang, Yuhao Gu, Xiao-Ming Ma, Hongtao Rong, Fayuan Zhang, Shu Guo, Chengcheng Zhang, Zhicheng Jiang, Yichen Yang, Wanling Liu, Qi Jiang, Zhengtai Liu, Mao Ye, Dawei Shen, Yi Liu, Shengtao Cui, Le Wang, Cai Liu, Junhao Lin, Ying Liu, Yongqing Cai, Jinlong Zhu, Chaoyu Chen, Jia-Wei Mei
CHINESE PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Yongqing Cai, Jianfeng Wang, Yuan Wang, Zhanyang Hao, Yixuan Liu, Liang Zhou, Xuelei Sui, Zhicheng Jiang, Shengjie Xu, Han Ge, Xiao-Ming Ma, Chengcheng Zhang, Zecheng Shen, Yichen Yang, Qi Jiang, Zhengtai Liu, Mao Ye, Dawei Shen, Yi Liu, Shengtao Cui, Le Wang, Cai Liu, Junhao Lin, Bing Huang, Liusuo Wu, Jincheng Zhuang, Hongtao He, Wenqing Zhang, Jia-Wei Mei, Chaoyu Chen
Summary: This study identifies a rare two-dimensional neutral line semimetal material protected by mirror symmetry and observes multiple type-II Dirac nodal lines close to the Fermi level through angle-resolved photoemission spectroscopy (ARPES), providing an electronic explanation for the nonsaturating magnetoresistance effect. These findings suggest CsV8Sb12 as an ideal platform for exploring novel transport properties.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yixuan Liu, Yuan Wang, Yongqing Cai, Zhanyang Hao, Xiao-Ming Ma, Le Wang, Cai Liu, Jian Chen, Liang Zhou, Jinhua Wang, Shanmin Wang, Hongtao He, Yi Liu, Shengtao Cui, Bing Huang, Jianfeng Wang, Chaoyu Chen, Jia-Wei Mei
Summary: The newly discovered kagome superconductors AV(3)Sb(5) (A = K, Rb, Cs) exhibit superconductivity, charge order, and band topology simultaneously. In this study, we investigate the doping evolution of underlying electronic structures in doped topological kagome superconductors Cs(V1-xTix)(3)Sb-5 and observe that the superconductivity survives in all doped samples despite the absence of the charge-density-wave (CDW) phase transition. The high-resolution angle-resolved photoemission spectroscopy (ARPES) measurements and first-principles simulations reveal the influence of Ti dopant on the band structure and explain the absence of the CDW ordering.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Mengru Cong, Han Ge, Lei Zhang, Weijun Ren, Nan Zhao, Tiantian Li, Shanmin Wang, Jinlong Zhu, Jiawei Mei, Qiang Zhang, Jieming Sheng, Fei Gao, Bing Li, Zhidong Zhang, Liusuo Wu
Summary: Geometrical frustration and strong quantum fluctuations in a two-dimensional triangular antiferromagnet, NdAuAl4Ge2, were studied. Thermodynamic and transport measurements were performed, revealing multiple phase transitions and anisotropy under magnetic field. The resistivity measurements indicated that NdAuAl4Ge2 is a good metal.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Z. M. Song, N. Zhao, H. Ge, T. T. Li, J. Yang, L. Wang, Y. Fu, Y. Z. Zhang, S. M. Wang, J. W. Mei, H. He, S. Guo, L. S. Wu, J. M. Sheng
Summary: We conducted a detailed study on the magnetic properties of KBaGd(BO3)2, which consists of magnetic Gd3+ (S = 7/2) ions forming two-dimensional triangular layers. The results showed the establishment of a long-range antiferromagnetic state below TN = 0.24 K. At zero fields, only about half of the full entropy was released at TN, indicating the frustration of the triangular spin lattice. Further studies under external fields revealed the formation of magnetic phase diagrams down to 50 mK.
Article
Materials Science, Multidisciplinary
Zhigang Gui, Chao Gu, Hu Cheng, Jinlong Zhu, Xiaohui Yu, Er-jia Guo, Liusuo Wu, Jiawei Mei, Jieming Sheng, Jianzhong Zhang, Junling Wang, Yusheng Zhao, Laurent Bellaiche, Li Huang, Shanmin Wang
Summary: A metallic material, CrN, is found to exhibit a multiferroic phenomenon similar to insulating multiferroic materials, with a spin-frustration-induced long-range antiparallel ordering of electric dipoles. This discovery provides an important sample for investigating new underlying physics and exploring unusual properties for practical applications.
Article
Materials Science, Multidisciplinary
Xiao Lei, Liang Zhou, Zhanyang Hao, Hongtao Liu, Shuo Yang, Haipeng Sun, Xiaozhou Ma, Chen Ma, Le Wang, Hai-Zhou Lu, Jia-Wei Mei, Jiannong Wang, Hongtao He
Summary: Shubnikov-de Hass oscillations are directly observed in undoped antiferromagnetic topological insulator MnBi2Te4. The oscillation period gradually decreases with increasing magnetic fields in the magnetic transition from canted antiferromagnetism to ferromagnetism and then saturates in high magnetic fields, indicating the field-induced evolution of the band structure. From the analysis of the high-field oscillations, a nontrivial Berry phase and a small effective mass are extracted. Furthermore, rotating the magnetization of MnBi2Te4 can lead to a splitting of the high-field oscillations, suggesting the enhanced asymmetry of the Weyl cones in tilted fields. Therefore, the observation of these magnetically tunable quantum oscillations clearly demonstrates the indispensable role of field in tuning the band structure or physical properties of MnBi2Te4.
Article
Chemistry, Multidisciplinary
Cheng Zhang, Le Wang, Yue Gu, Xi Zhang, Xiuquan Xia, Shaolong Jiang, Liang-Long Huang, Ying Fu, Cai Liu, Junhao Lin, Xiaolong Zou, Huimin Su, Jia-Wei Mei, Jun-Feng Dai
Summary: A layer-controlled ferromagnetic behavior is observed in atomically thin CrSiTe3 flakes, where the transition from soft to hard ferromagnetic state occurs with decreasing thickness. At a thickness around 8 nm, a single-domain and out-of-plane ferromagnetic order is observed. In addition, the formation of domain walls is suppressed with decreasing thickness, and a crossover from 3D to 2D Ising ferromagnets is observed.
Article
Materials Science, Multidisciplinary
N. Zhao, H. Ge, L. Zhou, Z. M. Song, J. Yang, T. T. Li, L. Wang, Y. Fu, Y. F. Zhang, J. B. Xu, S. M. Wang, J. W. Mei, X. Tong, L. S. Wu, J. M. Sheng
Summary: This paper investigates the low temperature magnetic properties of the rare-earth garnet compound Nd3Ga5O12 through magnetization, specific heat, and magnetocaloric effect measurements. The results reveal the magnetic thermal properties and crystal field calculations, as well as the antiferromagnetic ordered state under the application of a magnetic field.
