Article
Materials Science, Multidisciplinary
T. Shang, Y. Xu, D. J. Gawryluk, J. Z. Ma, T. Shiroka, M. Shi, E. Pomjakushina
Summary: The study reports an anomalous Hall resistivity in single crystals of EuAl4, possibly due to the manifestation of the topological Hall effect, which normally occurs in noncentrosymmetric materials.
Article
Physics, Multidisciplinary
Ken K. W. Ma, Ruojun Wang, Kun Yang
Summary: Supersymmetry (SUSY) plays a crucial role in particle physics by unifying different fundamental interactions between bosons and fermions. The realization and breaking of SUSY, particularly the N = (1, 0) SUSY, can lead to both SUSY-preserving and SUSY broken phases at the edge of the Moore-Read quantum Hall state, allowing for their unified description. The presence of a gapless fermionic Goldstino mode in the SUSY broken phase is of significance.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Mechanical
Qian Tang, Milivoj R. Belic, Yi Qi Zhang, Yan Peng Zhang, Yong Dong Li
Summary: Thanks to topological protection, photonic topological edge states can move along the edges of photonic crystals without radiating into the bulk or reflecting. In this work, we investigated the valley Hall edge state on the armchair-type domain wall in a honeycomb lattice and demonstrated that it can circumvent sharp corners with tiny reflection. These findings deepen the understanding of topological valley Hall edge states on different types of domain walls and may have applications in developing on-chip optical functional devices.
NONLINEAR DYNAMICS
(2022)
Article
Chemistry, Multidisciplinary
Felix Winterer, Anna M. Seiler, Areg Ghazaryan, Fabian R. Geisenhof, Kenji Watanabe, Takashi Taniguchi, Maksym Serbyn, R. Thomas Weitz
Summary: In this study, the formation of Dirac gullies and the interaction-induced breakdown of gully coherence were explored through magnetotransport measurements in high-quality Bernal-stacked trilayer graphene. The emergence of Dirac gullies in the quantum Hall regime and the control of electron-electron interactions through electric and magnetic fields were observed, leading to the lifting of gully degeneracy and the formation of a correlated ground state.
Article
Materials Science, Multidisciplinary
O. Song-Jin, Yong-Hwan Kim, Ok-Gyong Pak, Kum-Hyok Jong, Chol-Won Ri, Hak-Chol Pak
Summary: Researchers investigated doped graphene near the van Hove singularity and discovered rich ground-state phase diagrams with various superconducting and spin/charge-density wave phases. Surprisingly, they found that weak nearest-neighbor exchange coupling strongly suppresses chiral d-wave superconductivity in this system.
Article
Materials Science, Multidisciplinary
Leonardo S. Lima
Summary: This study investigates the thermodynamic quantities, such as entropy, specific heat, and magnetic susceptibility, in the next-nearest-neighbors Heisenberg model on a honeycomb-kagome lattice. The linear spin-wave approach is applied to obtain the temperature-dependent behavior of these quantities. Additionally, the entanglement negativity, a quantifier of quantum entanglement, and the spin Hall conductivity are also studied. The results show that all the thermodynamic quantities, as well as the entanglement negativity and spin Hall conductivity, exhibit an increasing trend with temperature. Furthermore, it is found that all the analyzed quantities approach zero in the low-temperature limit, consistent with experimental observations.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Chemistry, Multidisciplinary
Yinong Zhou, Feng Liu
Summary: By using first-principles calculations, the electronic and topological properties of an antiferromagnetic superatomic graphene lattice on a bipartite honeycomb lattice have been investigated. The material displays a Dirac Mott insulating state with a gap opening at the Dirac point due to long-range antiferromagnetic order, and shows a circular dichroism Hall effect with opposite directions of transversal Hall currents for left- and right-handed circularly polarized light.
Article
Physics, Condensed Matter
Dian-Cheng Zhang
Summary: A bosonic Creutz-Hubbard ladder is studied by solving the interacting Bose-Hubbard model, and a single-particle energy spectrum with two flat bands is obtained. The presence of flat bands leads to the identification of spontaneous disorder, breaking the translational symmetry. Beyond the flat bands, the checkerboard phase associated with Meissner currents and the regular biased ladder (BL) phase with interlaced chiral current are observed. Furthermore, a modulated BL phase is found, characterized by constant imbalance in the occupancies between two legs and periodic oscillations in the density distribution on each leg, followed by compound currents.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Alvaro Ferraz, Evgenii Kochetov
Summary: We demonstrate that the constrained lattice electrons can undergo fractionalization into charge/spin degrees of freedom due to strong electron correlation, leading to the recovery of an anomalous quantum Hall effect similar to an integer quantum Hall effect in the absence of an external magnetic field.
Article
Physics, Condensed Matter
Ye-Un An, O. Song-Jin, Kwang-Il Ryom, Il-Gwang Son
Summary: We study the many-body instabilities of correlated electrons on the half-filled honeycomb lattice with enhanced exchange coupling. A schematic ground-state phase diagram is determined using the truncated unity functional renormalization group approach. Different phases such as quantum spin Hall phase, spin-Kekule phase, three-sublattice, and incommensurate charge-density-wave phases are observed in the absence of on-site repulsion and with sizable next-nearest-neighbor repulsion and enhanced nearest-neighbor exchange interaction. A novel scheme combining the truncated unity functional renormalization group and the mean-field approximation is proposed to study the quantum spin Hall phase in detail.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Dongda Wu, Yi Wang, Jiamin Xiao, Jiang Hu, Xuchao Zhao, Yuhao Gao, Jiazhi Yuan, Wenxin Wang
Summary: In this study, an Al nanocone array in a honeycomb arrangement was used to achieve directional and polarized enhanced spontaneous emission of R6G. The research results showed that a 140-fold enhancement effect could be observed under specific pump power density. Additionally, the study found that the modification of the iso-frequency properties was influenced by the surface lattice resonance mode.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Dongda Wu, Yi Wang, Jiamin Xiao, Jiang Hu, Xuchao Zhao, Yuhao Gao, Jiazhi Yuan, Wenxin Wang
Summary: In this study, an Al nanocone array in a honeycomb arrangement was used to achieve the directional and polarized amplified spontaneous emission (ASE) of R6G. The interaction between the degenerated surface lattice resonance (SLR) mode and the emission of gain media resulted in 140-fold enhanced ASE. This research provides insights into the generation of nanolasing with directional emission and lays a foundation for the development of plasmonic devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Yves H. Kwan, Yichen Hu, Steven H. Simon, S. A. Parameswaran
Summary: The study reveals the topological features of neutral particle-hole pair excitations and their impact on the bound states in correlated QAH insulators. This results in the formation of topological exciton bands with robust features. The research also applies these ideas to broken-symmetry spontaneous QAH insulators in magic-angle twisted bilayer graphene with substrate alignment.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Dominik Szczesniak, Ewa A. Drzazga-Szczesniak
Summary: This study investigates the impact of non-adiabatic effects on the superconducting state in electron-doped graphene, revealing a significant reduction in key thermodynamic properties such as critical temperature and superconducting gap. Furthermore, it is found that the influence of non-adiabatic effects increases with the rise in depairing Coulomb interaction.
Article
Materials Science, Multidisciplinary
Francesco Libbi, Nicola Bonini, Nicola Marzari
Summary: The study focuses on the importance of lattice dynamics and quadratic behavior of flexural acoustic modes in low-dimensional materials, and proposes a potential form that accurately reproduces phonon dispersions of graphene and carbon nanotubes. The potential can also estimate lattice thermal conductivity effectively.
Article
Physics, Condensed Matter
Yuehua Su, Haijun Liao, Tao Li
JOURNAL OF PHYSICS-CONDENSED MATTER
(2015)
Article
Physics, Multidisciplinary
Yuehua Su, Chao Zhang, Tao Li
Article
Physics, Condensed Matter
Tao Li, Yuehua Su
JOURNAL OF PHYSICS-CONDENSED MATTER
(2017)
Article
Physics, Condensed Matter
Jiquan Pei, Steve Han, Haijun Liao, Tao Li
JOURNAL OF PHYSICS-CONDENSED MATTER
(2014)
Article
Materials Science, Multidisciplinary
Jiquan Pei, Steve Han, Haijun Liao, Tao Li
Article
Physics, Condensed Matter
Da-Wei Yao, Tao Li
JOURNAL OF PHYSICS-CONDENSED MATTER
(2018)
Article
Physics, Condensed Matter
Qiu Zhang, Tao Li
Summary: The study reveals that the SBMFT falls short in describing the dynamic behavior of spin systems, particularly in predicting the Goldstone mode and spin fluctuation mode in the magnetic ordered phase. These failures are attributed to the inability of spinon condensation to provide a consistent description, the lack of coupling between uncondensed spinons and spinon condensate, and the absence of rigidity related to the no double occupancy constraint on the spinon system.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Multidisciplinary
Tao Li
Summary: The antiferromagnetic Heisenberg model on the Kagome lattice is part of a continuous family of fully frustrated Heisenberg models where the lowest band becomes non-dispersive when J(2) = J(3) within a certain range. The ground state stability under perturbation of J(2) and J(3) is only present when J(2) = J(3). The flat band physics also plays a role in describing the RVB spin liquid state on the Kagome lattice.
Article
Materials Science, Multidisciplinary
Tao Li
Summary: Effective gauge theories based on slave particle construction are used to describe quantum number fractionalization in electron systems. By strictly enforcing the no-double-occupancy constraint on slave particles and using projective construction, a unified understanding of spin fractionalization mechanisms in spin liquids can be achieved.
Article
Materials Science, Multidisciplinary
Qiu Zhang, Tao Li
Summary: Recent numerical simulations have found a possible chiral spin-liquid state in the intermediate coupling regime of the triangular lattice Hubbard model, which can be explained by a bosonic resonating valence bond description. This state is characterized by a spin Berry phase of p 2 per triangle, and its topological property is not captured in the Schwinger boson mean-field description due to the lack of boson rigidity caused by the no double occupancy constraint.
Article
Physics, Condensed Matter
Tao Li, Da-Wei Yao
JOURNAL OF PHYSICS-CONDENSED MATTER
(2020)
Article
Materials Science, Multidisciplinary
Chun Zhang, Tao Li
Article
Materials Science, Multidisciplinary
Chun Zhang, Tao Li
Article
Materials Science, Multidisciplinary
Kazuhiro Seki, Tomonori Shirakawa, Qinfang Zhang, Tao Li, Seiji Yunoki
Proceedings Paper
Physics, Multidisciplinary
Kazuhiro Seki, Tomonori Shirakawa, Qinfang Zhang, Tao Li, Seiji Yunoki
INTERNATIONAL WORKSHOP ON DIRAC ELECTRONS IN SOLIDS 2015
(2015)
