Yongyao Li
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View article: Stable hopfions in trapped quantum droplets
Stable hopfions in trapped quantum droplets Open
Hopfions are a class of three-dimensional (3D) solitons which are built as vortex tori carrying intrinsic twist of the toroidal core. They are characterized by two independent topological charges, \textit{viz}., vorticity $S$ and winding n…
View article: Chiral solitons in quadratic quasi-phase-matched photonic crystals
Chiral solitons in quadratic quasi-phase-matched photonic crystals Open
We introduce a quasi-phase-matched technique in quadratic nonlinear crystals, constructing an artificial gauge field by changing the inclination angle of stripes, which is realized by the positive and negative polarization directions of no…
View article: Tightly self-trapped modes and vortices in three-dimensional bosonic condensates with electromagnetically induced gravity
Tightly self-trapped modes and vortices in three-dimensional bosonic condensates with electromagnetically induced gravity Open
The $1/r$ long-range interaction, induced by laser illumination, offers a mechanism for the implementation of stable self-trapping in Bose-Einstein condensates (BECs) in the three-dimensional free space. Using the variational approximation…
View article: Research on Driving Mechanism of Ecological Industry for Ecological Civilization in the Karst Rural Area
Research on Driving Mechanism of Ecological Industry for Ecological Civilization in the Karst Rural Area Open
It is crucial to clarify the relationship between ecological industry development and ecological civilization construction, as well as their driving forces, to promote high-quality local development. The ecological environment of the karst…
View article: Elongated vortex quantum droplets in binary Bose-Einstein condensates
Elongated vortex quantum droplets in binary Bose-Einstein condensates Open
Stability of elongated (``slender") quantum droplets (QDs) with embedded unitary and multiple vorticity is a problem that was not solved previously. In this work, we propose a solution which relies upon the use of the spatial modulation of…
View article: Solitons in Bose-Einstein Condensates with Attractive Self-Interaction on a Möbius Strip
Solitons in Bose-Einstein Condensates with Attractive Self-Interaction on a Möbius Strip Open
We study the matter-wave solitons in Bose-Einstein condensate (BEC) trapped on a Möbius strip (MS), based on the respective Gross-Pitaevskii (GP) equation with the mean-field theory. In the linear regime, vortex states are characterized by…
View article: Adaptive Construction of Freeform Surface to Integrable Ray Mapping Using Implicit Fixed-Point Iteration
Adaptive Construction of Freeform Surface to Integrable Ray Mapping Using Implicit Fixed-Point Iteration Open
Constructing a freeform surface that accurately satisfies both integrable condition and Snell’s law under a given invariant source–target map is challenging for freeform design. Here, we propose a fixed-point iteration method to address th…
View article: Spatio-temporal dynamics of grassland ecosystem services and the segmentation effects of their drivers: A case in South China Karst
Spatio-temporal dynamics of grassland ecosystem services and the segmentation effects of their drivers: A case in South China Karst Open
Maintaining grassland stock and improving its ecosystem services (ES) are critical yet challenging for ecological and economic sustainability. However, the diversity and spatial heterogeneity of global grasslands pose significant challenge…
View article: Geometric Phase in Four-Wave Mixing Processes Under Wedge Trajectory
Geometric Phase in Four-Wave Mixing Processes Under Wedge Trajectory Open
View article: Green Finance and Value Realization of Forest Ecological Products in Karst Areas: A Mediating-Effect Perspective Based on the Level of Karst Desertification
Green Finance and Value Realization of Forest Ecological Products in Karst Areas: A Mediating-Effect Perspective Based on the Level of Karst Desertification Open
With their unique karst geomorphology and rich biodiversity, forest ecosystems present huge ecological potential, and their ecological products promise great economic value. In this context, an important way to realize the sustainable deve…
View article: Two-doublon Bloch oscillations in the mass-imbalanced extended Fermi-Hubbard model
Two-doublon Bloch oscillations in the mass-imbalanced extended Fermi-Hubbard model Open
Interactions between particles normally induce the decay of the particles\nBloch oscillations (BOs) in a periodic lattice. In the limit of strong on-site\ninteractions, spin-$1/2$ fermions may form doublon bound states and undergo BOs\nin …
View article: Exploring Trade-Offs and Synergies in Social–Ecological System Services across Ecological Engineering Impact Regions: Insights from South China Karst
Exploring Trade-Offs and Synergies in Social–Ecological System Services across Ecological Engineering Impact Regions: Insights from South China Karst Open
Karst ecosystems have become complex social–ecological systems (SESs) as a result of the interventions of large-scale ecological restoration programs, and the ecosystem services (ESs) that provide regional well-being can, to some extent, b…
View article: A Set Covering Approach to Design Maximally Permissive Supervisors for Flexible Manufacturing Systems
A Set Covering Approach to Design Maximally Permissive Supervisors for Flexible Manufacturing Systems Open
The supervisory control of Petri nets aims to enforce the undesired behavior as unreachable by designing a set of control places. This work presents a set cover approach to design maximally permissive supervisors. For each first-met bad ma…
View article: Three-dimensional isotropic droplets in Rydberg-dressed Bose gases
Three-dimensional isotropic droplets in Rydberg-dressed Bose gases Open
We predict a scheme for the creation of isotropic three-dimensional quantum droplets in Rydbeg-dressed Bose gases, which contain both repulsive contact interactions and attractive soft-core interactions. Via manipulating laser detuning, th…
View article: Two-dimensional quantum droplets in binary quadrupolar condensates
Two-dimensional quantum droplets in binary quadrupolar condensates Open
We study the stability and characteristics of two-dimensional (2D) quasi-isotropic quantum droplets (QDs) of fundamental and vortex types, formed by binary Bose–Einstein condensate with magnetic quadrupole–quadrupole interactions (MQQIs). …
View article: Geometry-dependent acoustic higher-order topological phases on a two-dimensional honeycomb lattice
Geometry-dependent acoustic higher-order topological phases on a two-dimensional honeycomb lattice Open
Higher-order topological states, as emergent topological phases of matter, originating from condensed matter physics, have sparked a vibrant exploration of topological insulators. Their topologically protected multidimensional localized st…
View article: Transition from anisotropic to isotropic optical absorption in core-shell square nanowires tuned by anti-crossing engineering
Transition from anisotropic to isotropic optical absorption in core-shell square nanowires tuned by anti-crossing engineering Open
The transition from anisotropic to isotropic optical properties in nanostructures plays an important role in developing next-generation intelligent photonic devices. Currently, core-shell nanostructures, frequently accompanied by different…
View article: Energy-level inversion for vortex states in spin-orbit coupled Bose-Einstein condensates
Energy-level inversion for vortex states in spin-orbit coupled Bose-Einstein condensates Open
We investigate vortex states in Bose-Einstein condensates under the combined action of the spin-orbit coupling (SOC), gradient magnetic field, and harmonic-oscillator trapping potential. The linear version of the system is solved exactly. …
View article: Realizing the value of grassland ecosystem services: global practice and its inspiration for the karst desertification control area
Realizing the value of grassland ecosystem services: global practice and its inspiration for the karst desertification control area Open
The conflict between grassland ecosystem conservation and economic development is an important but challenging question. Realizing the value of ecosystem services (ES) is considered to be a solution for the dual sustainability of ecology a…
View article: Two-dimensional anisotropic vortex quantum droplets in dipolar Bose-Einstein condensates
Two-dimensional anisotropic vortex quantum droplets in dipolar Bose-Einstein condensates Open
Creation of stable intrinsically anisotropic self-bound states with embedded vorticity is a challenging issue. Previously, no such states in Bose-Einstein condensates (BECs) or other physical settings were known. Dipolar BEC suggests a uni…
View article: Strongly anisotropic vortices in dipolar quantum droplets
Strongly anisotropic vortices in dipolar quantum droplets Open
We construct strongly anisotropic quantum droplets with embedded vorticity in the 3D space, with mutually perpendicular vortex axis and polarization of atomic magnetic moments. Stability of these anisotropic vortex quantum droplets (AVQDs)…
View article: Semidiscrete optical vortex droplets in quasi-phase-matched photonic crystals
Semidiscrete optical vortex droplets in quasi-phase-matched photonic crystals Open
What we believe is a new scheme for producing semidiscrete self-trapped vortices (“swirling photon droplets”) in photonic crystals with competing quadratic ( χ (2) ) and self-defocusing cubic ( χ (3) ) nonlinearities is proposed. The photo…
View article: Ring-shaped quantum droplets with hidden vorticity in a radially-periodic potential
Ring-shaped quantum droplets with hidden vorticity in a radially-periodic potential Open
We study the stability and characteristics of two-dimensional (2D) circular quantum droplets (QDs) with embedded hidden vorticity (HV), i.e., opposite angular momenta in two components, formed by binary Bose-Einstein condensates (BECs) tra…
View article: Semidiscrete optical vortex droplets in quasi-phase-matched photonic crystals
Semidiscrete optical vortex droplets in quasi-phase-matched photonic crystals Open
A new scheme for producing semidiscrete self-trapped vortices (\textquotedblleft swirling photon droplets\textquotedblright ) in photonic crystals with competing quadratic ($χ^{(2)}$) and self-defocusing cubic ($χ^{(3)}$) nonlinearities is…
View article: Analyzing Characteristics of Grassland Gross Ecosystem Product to Inform Decision Making in the Karst Desertification Control
Analyzing Characteristics of Grassland Gross Ecosystem Product to Inform Decision Making in the Karst Desertification Control Open
Synergistically enhancing and realizing the value of grassland ecosystem services (ES) for economic activity is an important but challenging task for achieving sustainability in the karst desertification control (KDC). However, how to use …
View article: Placement of parameter server in wide area network topology for geo-distributed machine learning
Placement of parameter server in wide area network topology for geo-distributed machine learning Open
Machine learning (ML) is extensively used in a wide range of real-world applications that require data all around world to pursue high accuracy of a global model. Unfortunately, it is impossible to transmit all gathered raw data to a centr…
View article: Two-Dimensional Quantum Droplets in Binary Dipolar Bose-Bose Mixture
Two-Dimensional Quantum Droplets in Binary Dipolar Bose-Bose Mixture Open
We study two-dimensional (2D) isotropic quantum droplets (QDs) in dipolar binary Bose–Einstein condensates (BECs). The QDs are supported by the competition between the 2D form of the Lee-Huang-Yang (LHY) term and the isotropic dipole-dipol…
View article: Vortex solitons in quasi-phase-matched photonic crystals
Vortex solitons in quasi-phase-matched photonic crystals Open
We report solutions for stable compound solitons in a three-dimensional quasi-phase-matched photonic crystal with the quadratic ($χ^{(2)}$) nonlinearity. The photonic crystal is introduced with a checkerboard structure, which can be realiz…
View article: Design of UVC Surface Disinfection Robot with Coverage Path Planning Using Map-Based Approach At-The-Edge
Design of UVC Surface Disinfection Robot with Coverage Path Planning Using Map-Based Approach At-The-Edge Open
In response to the issue of virus contamination in the cold-chain warehouse or hospital environment under the influence of the COVID-19, we propose the design work of a disinfection robot based on the UVC radiation mechanism using the low-…
View article: Vortex gap solitons in spin-orbit-coupled Bose-Einstein condensates with competing nonlinearities
Vortex gap solitons in spin-orbit-coupled Bose-Einstein condensates with competing nonlinearities Open
The formation and dynamics of full vortex gap solitons (FVGSs) is investigated in two-component Bose-Einstein condensates with spin-orbit coupling (SOC), Zeeman splitting (ZS), and competing cubic and quintic nonlinear terms, while the usu…