Article
Materials Science, Multidisciplinary
Francesco Ferrari, Alberto Parola, Federico Becca
Summary: We show that gapless spin liquids become trivial insulators on cylindrical geometries with an even number of legs and demonstrate the sharp difference between the ground-state properties obtained within cylinders or directly in the two-dimensional lattice. By choosing different boundary conditions for the fermionic degrees of freedom, both gapless and gapped states may be realized. Our results shed light on the difficulty to detect bona fide gapless spin liquids in such cylindrical geometries.
Article
Materials Science, Multidisciplinary
Tomonari Mizoguchi, Yoshihito Kuno, Yasuhiro Hatsugai
Summary: The study reveals characteristic band structures of fermions on a square kagome lattice, including flat bands and two spin-1 Dirac cones. Additionally, in the presence of an external field, the profile of the Chern numbers around the modified spin-1 Dirac cones coincides with the conventional one.
Article
Materials Science, Multidisciplinary
Anjishnu Bose, Arijit Haldar, Erik S. Sorensen, Arun Paramekanti
Summary: The breaking of chiral and time-reversal symmetries leads to the emergence of exotic quantum phenomena and topological phases. The connection between chiral spin liquids (CSLs) and nearby ordered states has been a mystery, but recent research has shown that competing magnetic orders with uniform scalar chirality, namely the XYZ umbrella state and the octahedral spin crystal, are closely related to CSLs on the kagome lattice. This highlights the intimate link between topologically ordered liquids and broken symmetry states with nontrivial real-space topology.
Article
Materials Science, Multidisciplinary
Shi Feng, Gonzalo Alvarez, Nandini Trivedi
Summary: In this study, we investigate the spin chains with bilinear-biquadratic spin interactions and reveal a gapless to gapless transition as a function of an applied magnetic field. We find that the excitation modes split and form a new set of excitations at a specific magnetic field value, and explain the mechanism of this transition. Moreover, we discuss the universality of the central charges for the family of models subjected to a magnetic field.
Article
Physics, Multidisciplinary
Kamil K. Kolincio, Max Hirschberger, Jan Masell, Taka-hisa Arima, Naoto Nagaosa, Yoshinori Tokura
Summary: Dynamical spin fluctuations in magnets can be influenced by lattice geometry, leading to chiral spin fluctuations and fluctuation-related transport anomalies. This study focuses on the crucial role of lattice geometry on chiral spin fluctuations and the quantum-mechanical phase of conduction electrons. Experimental results and Monte Carlo calculations suggest that lattices with dissimilar plaquettes exhibit the most promising Berry phase phenomena in paramagnets.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Fabrizio Oliviero, Joao Augusto Sobral, Eric C. Andrade, Rodrigo G. Pereira
Summary: This study investigates a spin-1/2 model on the kagome lattice and finds that the competition between chiral three-spin interactions and Heisenberg exchange interactions leads to unusual ground states of spin systems.
Article
Materials Science, Multidisciplinary
Mutsuki Saito, Ryunosuke Takagishi, Nobuyuki Kurita, Masari Watanabe, Hidekazu Tanaka, Ryuji Nomura, Yoshiyuki Fukumoto, Kazuhiko Ikeuchi, Ryoichi Kajimoto
Summary: Cs2Cu3SnF12 and Rb2Cu3SnF12 are two spin-1/2 antiferromagnets with different structures, and their magnetic excitation structures were investigated using inelastic neutron scattering. Four single-magnon excitation modes were observed in Cs2Cu3SnF12, and a broad excitation continuum was found. In Rb2Cu3SnF12, singlet-triplet excitations from the pinwheel VBS state were confirmed, along with ghost modes caused by the enlargement of the chemical unit cell.
Article
Materials Science, Multidisciplinary
Johannes Richter, Oleg Derzhko, Juergen Schnack
Summary: Over the last decade, the interest in the spin-1/2 Heisenberg antiferromagnet (HAF) on the square kagome lattice has been growing. This model system is a prominent example of quantum magnetism with a quantum paramagnetic ground state, flat-band physics near the saturation field, and quantum scars. Recent numerical investigations have revealed a gapless spin liquid in the square kagome magnet. The study also provides insights into specific heat, entropy, and susceptibility, revealing low-temperature shoulder below the major maximum and a change in curvature just at a specific temperature, attributed to low-lying singlet excitations and the singlet-triplet gap.
Article
Chemistry, Multidisciplinary
Jianpei Xing, Xue Jiang, Zhifeng Liu, Yan Qi, Jijun Zhao
Summary: We discovered a family of two-dimensional oxalate-based metal-organic frameworks (MOFs) with robust spin-polarized Dirac cones. The 2D MOFs of Ni-2(C2O4)(3) and Re-2(C2O4)(3) exhibit intrinsic Dirac spin gapless semiconductor properties, large magnetic moments, high Curie temperatures, and large perpendicular magnetic anisotropy. Furthermore, Re-2(C2O4)(3) displays a topologically nontrivial band gap resulting from spin-orbit coupling.
Article
Chemistry, Physical
Yu-Xiao Jiang, Jia-Xin Yin, M. Michael Denner, Nana Shumiya, Brenden R. Ortiz, Gang Xu, Zurab Guguchia, Junyi He, Md Shafayat Hossain, Xiaoxiong Liu, Jacob Ruff, Linus Kautzsch, Songtian S. Zhang, Guoqing Chang, Ilya Belopolski, Qi Zhang, Tyler A. Cochran, Daniel Multer, Maksim Litskevich, Zi-Jia Cheng, Xian P. Yang, Ziqiang Wang, Ronny Thomale, Titus Neupert, Stephen D. Wilson, M. Zahid Hasan
Summary: The study reveals an unconventional chiral charge order in KV3Sb5, a material with both a topological band structure and a superconducting ground state, using high-resolution scanning tunnelling microscopy. A 2 x 2 superlattice structure is observed in the experiment, along with an energy gap opening and charge modulation across the Fermi level.
Article
Materials Science, Multidisciplinary
Blazej Jaworowski, Anne E. B. Nielsen
Summary: In this study, we search for short-range Hamiltonians that maximize the overlaps with lattice Moore-Read states in finite spin-1 kagome systems. We start with an exact long-range parent Hamiltonian obtained from conformal field theory, and apply a truncation procedure to retain only short-range terms and define the Hamiltonian on a torus. Finally, we optimize the remaining coefficients to obtain maximized overlaps between the exact diagonalization results and the model ground states.
Article
Materials Science, Multidisciplinary
A. Zelenskiy, T. L. Monchesky, M. L. Plumer, B. W. Southern
Summary: Compounds with magnetic Mn atoms forming AB-stacked kagome lattices, such as Mn3X, have attracted significant attention. A new general symmetry-based model reveals the presence of interplane Dzyaloshinskii-Moriya interactions and competitive anisotropic exchange interactions in these compounds. These interactions strongly impact the ground state configurations and elementary spin-wave excitations.
Article
Materials Science, Multidisciplinary
Jiabin Liu, Long Yuan, Xuan Li, Boqiang Li, Kan Zhao, Haijun Liao, Yuesheng Li
Summary: We demonstrate that YCu3[OH(D)]6.5Br2.5 (YCOB) is a kagome Heisenberg antiferromagnet without evident orphan spins. The mixing of polar OH- and nonpolar Br- at different sites leads to local distortions and the formation of randomly distributed hexagons on the kagome lattice. The study provides insights into the theoretical understanding of gapless quantum spin liquid behavior in YCOB and other relevant materials.
Article
Physics, Multidisciplinary
Henrik Schlueter, Johannes Richter, Juergen Schnack
Summary: Unconventional features such as plateaus or jumps in the magnetization curve at zero temperature are a characteristic of frustrated spin systems. However, very little is known about their behavior at non-zero temperatures. In this study, we examine the temperature dependence of the magnetization curve of the kagome lattice antiferromagnet, specifically at 1/3 of the saturation magnetization, and observe an asymmetric melting phenomenon. We compare our findings to the square-kagome lattice and find similar behavior at low temperatures but differences at 1/3 of the saturation magnetization.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Physics, Multidisciplinary
Tessa Cookmeyer, Johannes Motruk, Joel E. Moore
Summary: This study shows that under certain physical parameters, the additional four-spin interactions naturally generated in the Hubbard model will stabilize a chiral spin liquid of Kalmeyer-Laughlin type. By rewriting the interactions mean-field, a physical understanding of the origin of this spin liquid can be obtained.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Laura Messio, Samuel Bieri, Claire Lhuillier, Bernard Bernu
PHYSICAL REVIEW LETTERS
(2017)
Article
Physics, Multidisciplinary
P. Khuntia, M. Velazquez, Q. Barthelemy, F. Bert, E. Kermarrec, A. Legros, B. Bernu, L. Messio, A. Zorko, P. Mendels
Article
Statistics & Probability
Guillaume Marrelec, Alain Giron, Laura Messio
Summary: The study investigates a specific Gaussian graphical model and finds that pairwise correlation decays exponentially with distance, while also analyzing the difference between finite and infinite cases as the number of variables tends to infinity.
STATISTICS & PROBABILITY LETTERS
(2021)
Article
Physics, Multidisciplinary
Quentin Barthelemy, Albin Demuer, Christophe Marcenat, Thierry Klein, Bernard Bernu, Laura Messio, Matias Velazquez, Edwin Kermarrec, Fabrice Bert, Philippe Mendels
Summary: Measuring the specific heat of herbertsmithite single crystals in high magnetic fields allows us to isolate and understand the low-temperature kagome contribution. The kagome contribution is found to be independent of the applied magnetic field within a specific temperature range, and this behavior can be reproduced by considering non-contributing sites. Additionally, anomalies in the total specific heat at very low temperatures and moderate fields are observed and further investigated.
Article
Physics, Multidisciplinary
Matias G. Gonzalez, Bernard Bernu, Laurent Pierre, Laura Messio
Summary: The realization of the spin-1/2 triangular lattice antiferromagnetic Heisenberg model in the Ba8CoNb6O24 compound is studied. The ground-state and thermodynamic properties are evaluated using the entropy method and compared to experiments. The results confirm the validity of the model in the compound and provide further possibilities for detailed investigations.
Article
Materials Science, Multidisciplinary
Vincent Grison, Pascal Viot, Bernard Bernu, Laura Messio
Article
Materials Science, Multidisciplinary
Bernard Bernu, Laurent Pierre, Karim Essafi, Laura Messio
Article
Physics, Fluids & Plasmas
Melody Merle, Laura Messio, Julien Mozziconacci
Article
Physics, Multidisciplinary
Rodrigo G. Pereira, Samuel Bieri
Article
Materials Science, Multidisciplinary
Francesco Ferrari, Samuel Bieri, Federico Becca
Article
Materials Science, Multidisciplinary
B. Fak, S. Bieri, E. Canevet, L. Messio, C. Payen, M. Viaud, C. Guillot-Deudon, C. Darie, J. Ollivier, P. Mendels
Article
Materials Science, Multidisciplinary
M. G. Gonzalez, B. Bernu, L. Pierre, L. Messio
Summary: The study proposes an interpolation method for predicting specific heat with a logarithmic singularity, showing excellent agreement with exact solutions in various models. The method's effectiveness is demonstrated through tests on different models, highlighting its accuracy in predicting specific heat behavior near critical temperatures.