Zi Yang Meng
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View article: Continuous transition and gapless roton inside fractional quantum anomalous Hall states
Continuous transition and gapless roton inside fractional quantum anomalous Hall states Open
Collective excitations play a vital role in understanding the exotic phases of matter and phase transitions in quantum many-body systems. For the first time, we numerically (via exact diagonalization and density matrix renormalization grou…
View article: Entanglement architecture of beyond-Landau quantum criticality
Entanglement architecture of beyond-Landau quantum criticality Open
Quantum critical points beyond the Landau paradigm exhibit fractionalized excitations and emergent gauge fields. Here, we use entanglement microscopy--full tomography of the reduced density matrix of small subregions and subsequent extract…
View article: Probing Non-Fermi-Liquid Behaviour of Composite Fermi Liquid via Efficient Thermal Simulations
Probing Non-Fermi-Liquid Behaviour of Composite Fermi Liquid via Efficient Thermal Simulations Open
The two-dimensional electron gas in a perpendicular magnetic field, i.e., the quantum Hall system, is remarkably rich. At half filling of the lowest Landau level, it has been predicted that ``composite fermions'' -- emergent quasiparticle …
View article: Phase Transitions and Remnants of Fractionalization at Finite Temperature in the Triangular Lattice Quantum Loop Model
Phase Transitions and Remnants of Fractionalization at Finite Temperature in the Triangular Lattice Quantum Loop Model Open
The quantum loop and dimer models are archetypal correlated systems with local constraints. With natural foundations in statistical mechanics, they are of direct relevance to various important physical concepts and systems, such as topolog…
View article: Emergent gauge flux in QED$_3$ with flavor chemical potential: application to magnetized U(1) Dirac spin liquids
Emergent gauge flux in QED$_3$ with flavor chemical potential: application to magnetized U(1) Dirac spin liquids Open
We design a lattice model of non-compact U(1) gauge field coupled to fermions with a flavor chemical potential and solve it with large-scale determinant quantum Monte Carlo simulations. For zero flavor chemical potential, the model realize…
View article: Climate adaptation in <i>Populus trichocarpa</i>: key adaptive loci identified for stomata and leaf traits
Climate adaptation in <i>Populus trichocarpa</i>: key adaptive loci identified for stomata and leaf traits Open
Summary We investigated adaptive genetic variation in Populus trichocarpa , a potential biofuel feedstock crop, to better understand how physiological traits may influence tolerance to water limitation. Our study focused on leaf and stomat…
View article: Symmetrizing the constraints: Density matrix renormalization group for constrained lattice models
Symmetrizing the constraints: Density matrix renormalization group for constrained lattice models Open
We develop a density matrix renormalization group (DMRG) algorithm for constrained quantum lattice models that successfully {\it{implements the local constraints as symmetries in the contraction of the matrix product states and matrix prod…
View article: Interaction-induced nematic Dirac semimetal from quadratic band touching: A constrained-path quantum Monte Carlo study
Interaction-induced nematic Dirac semimetal from quadratic band touching: A constrained-path quantum Monte Carlo study Open
Electronic systems with quadratic band touchings, commonly found in two- and three-dimensional materials such as Bernal-stacked bilayer graphene, kagome metals, HgTe, and pyrochlore iridates, have attracted significant interest concerning …
View article: Self-learning Monte Carlo Method: A Review
Self-learning Monte Carlo Method: A Review Open
The Self-Learning Monte Carlo (SLMC) method is a Monte Carlo approach that has emerged in recent years by integrating concepts from machine learning with conventional Monte Carlo techniques. Designed to accelerate the numerical study of in…
View article: Multiparty entanglement microscopy of quantum Ising models in one, two, and three dimensions
Multiparty entanglement microscopy of quantum Ising models in one, two, and three dimensions Open
Entanglement microscopy reveals the true quantum correlations among the microscopic building blocks of many-body systems [Nat. Commun. 16, 96 (2025)]. Using this approach, we study the multipartite entanglement of the quantum Ising model i…
View article: Generic (fractional) quantum anomalous Hall crystals from interaction-driven band folding
Generic (fractional) quantum anomalous Hall crystals from interaction-driven band folding Open
Among the extensive studies of fractional quantum anomalous Hall (FQAH) states, there recently appears a growing interest in the topological states with coexisting charge density wave (CDW) orders. Such states are referred to as Hall cryst…
View article: Monte Carlo Simulation of Operator Dynamics and Entanglement in Dual-Unitary Circuits
Monte Carlo Simulation of Operator Dynamics and Entanglement in Dual-Unitary Circuits Open
We investigate operator dynamics and entanglement growth in dual-unitary circuits, a class of locally scrambled quantum systems that enables efficient simulation beyond the exponential complexity of the Hilbert space. By mapping the operat…
View article: Analog of Topological Entanglement Entropy for Mixed States
Analog of Topological Entanglement Entropy for Mixed States Open
We propose the convex-roof extension of quantum conditional mutual information (“co(QCMI)”) as a diagnostic of topological order in a mixed state. We focus primarily on topological states subjected to local decoherence, and employ the Levi…
View article: Deconfined quantum critical point lost in pressurized SrCu2(BO3)2
Deconfined quantum critical point lost in pressurized SrCu2(BO3)2 Open
The deconfinement quantum critical point (DQCP), a paradigm beyond the Landau-Ginzburg-Wilson framework to classify states of matters, has been attracting extensive attention over the past two decades. Experimentally, SrCu2(BO3)2 plays key…
View article: Magnetic Bloch states at integer flux quanta induced by super-moiré potential in graphene aligned with twisted boron nitride
Magnetic Bloch states at integer flux quanta induced by super-moiré potential in graphene aligned with twisted boron nitride Open
Two-dimensional electron systems in both magnetic fields and periodic potentials are described by the Hofstadter butterfly, a fundamental problem of solid-state physics. While moiré systems provide a powerful method to realize this type of…
View article: Magnetic Bloch States at Integer Flux Quanta Induced by Super-moiré Potential in Graphene Aligned with Twisted Boron Nitride
Magnetic Bloch States at Integer Flux Quanta Induced by Super-moiré Potential in Graphene Aligned with Twisted Boron Nitride Open
Two-dimensional electron systems in both magnetic fields and periodic potentials are described by Hofstadter butterfly, a fundamental problem of solid-state physics. While moiré systems provide a powerful method to realize this spectrum, p…
View article: Evolution of entanglement entropy at SU( <i>N</i> ) deconfined quantum critical points
Evolution of entanglement entropy at SU( <i>N</i> ) deconfined quantum critical points Open
Over past two decades, the enigma of the deconfined quantum critical point (DQCP) has attracted broad attention across physics communities, as it offers a new paradigm beyond the Landau-Ginzburg-Wilson framework. However, the nature of DQC…
View article: Angle-Tuned Gross-Neveu Quantum Criticality in Twisted Bilayer Graphene: A Quantum Monte Carlo Study
Angle-Tuned Gross-Neveu Quantum Criticality in Twisted Bilayer Graphene: A Quantum Monte Carlo Study Open
Twisted bilayber graphene (TBG) has revealed fascinating quantum many-body states, and unstrained chargeneutral TBG at 1.08° is understood, both experimentally and theoretically , as a correlated insulator due to the interplay of long-rang…
View article: Entanglement microscopy and tomography in many-body systems
Entanglement microscopy and tomography in many-body systems Open
Quantum entanglement uncovers the essential principles of quantum matter, yet determining its structure in realistic many-body systems poses significant challenges. Here, we employ a protocol, dubbed entanglement microscopy, to reveal the …
View article: Research on Improved Algorithm for Safety Helmet Detection Based on YOLOv5
Research on Improved Algorithm for Safety Helmet Detection Based on YOLOv5 Open
In order to improve the accuracy and robustness of helmet wearing detection, the algorithm was further optimized based on YOLOv5, combined with CBAM attention mechanism, BiFPN structure, Focal loss function and other technologies, signific…
View article: Spectra of Magnetoroton and Chiral Graviton Modes of Fractional Chern Insulator
Spectra of Magnetoroton and Chiral Graviton Modes of Fractional Chern Insulator Open
Employing the state-of-the-art time-dependent variational principle (TDVP) algorithm, we compute the spectra of charge-neutral excitations in the $ν=1/2$ (bosonic) \updated{ and $1/3$ (fermionic) fractional Chern insulator (FCI)} on the Ha…
View article: Angle-Tuned Gross-Neveu Quantum Criticality in Twisted Bilayer Graphene: A Quantum Monte Carlo Study
Angle-Tuned Gross-Neveu Quantum Criticality in Twisted Bilayer Graphene: A Quantum Monte Carlo Study Open
The fascinating quantum many-body states in twisted bilayber graphene (TBG) at magic angle, due to the interplay of Coulomb interactions and the quantum metrics of flat bands, have been well understood both experimentally and theoretically…
View article: Monte Carlo Simulation of Operator Dynamics and Entanglement in Dual-Unitary Circuits
Monte Carlo Simulation of Operator Dynamics and Entanglement in Dual-Unitary Circuits Open
We investigate operator dynamics and entanglement growth in dual-unitary circuits, a class of locally scrambled quantum systems that enables efficient simulation beyond the exponential complexity of the Hilbert space. By mapping the operat…
View article: Vestigial Gapless Boson Density Wave Emerging between $ν= 1/2$ Fractional Chern Insulator and Finite-Momentum Supersolid
Vestigial Gapless Boson Density Wave Emerging between $ν= 1/2$ Fractional Chern Insulator and Finite-Momentum Supersolid Open
The roton-triggered charge-density-wave (CDW)is widely studied in fractional quantum Hall (FQH) and fractional Chern insulator (FCI) systems, and there also exist field theoretical and numerical realizations of continuous transition from F…
View article: An analog of topological entanglement entropy for mixed states
An analog of topological entanglement entropy for mixed states Open
We propose the convex-roof extension of quantum conditional mutual information ("co(QCMI)") as a diagnostic of topological order in a mixed state. We focus primarily on topological states subjected to local decoherence, and employ the Levi…
View article: Climate adaptation in<i>P. trichocarpa</i>: key adaptive loci identified for stomata and leaf traits
Climate adaptation in<i>P. trichocarpa</i>: key adaptive loci identified for stomata and leaf traits Open
Identifying the genetic basis of traits underlying climate adaptation remains a key goal for predicting species responses to climate change, enabling the elucidation of gene targets for future climate-resilient crops. Here, we measured 14 …
View article: Hidden orders and phase transitions for the fully packed quantum loop model on the triangular lattice
Hidden orders and phase transitions for the fully packed quantum loop model on the triangular lattice Open
Quantum loop and dimer models are prototypical correlated systems with local constraints, which are not only intimately connected to lattice gauge theories and topological orders but are also widely applicable to the broad research areas o…
View article: Experimental Evidence for a Berry Curvature Quadrupole in an Antiferromagnet
Experimental Evidence for a Berry Curvature Quadrupole in an Antiferromagnet Open
Berry curvature multipoles appearing in topological quantum materials have recently attracted much attention. Their presence can manifest in novel phenomena, such as nonlinear anomalous Hall effects (NLAHE). The notion of Berry curvature m…