Li Ge
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View article: Photonic neuromorphic computing using symmetry-protected zero modes in coupled nanolaser arrays
Photonic neuromorphic computing using symmetry-protected zero modes in coupled nanolaser arrays Open
View article: Twisted light from topological chiral exceptional points in a nanolaser array
Twisted light from topological chiral exceptional points in a nanolaser array Open
We propose and experimentally demonstrate an orbital angular momentum (OAM) nanolaser array arranged in a ring geometry on an InP-based photonic crystal membrane. The device realizes a non-Hermitian extension of the Rice-Mele model, featur…
View article: Erratum: Non-Hermitian gauged laser arrays with localized excitations: Anomalous threshold and generalized principle of selective pumping [Phys. Rev. B <b>108</b>, 104111 (2023)]
Erratum: Non-Hermitian gauged laser arrays with localized excitations: Anomalous threshold and generalized principle of selective pumping [Phys. Rev. B <b>108</b>, 104111 (2023)] Open
View article: Evaluating the impact of interactive video-based case-based learning in clinical medical education: a randomized controlled trial
Evaluating the impact of interactive video-based case-based learning in clinical medical education: a randomized controlled trial Open
Background Traditional Case-Based Learning (CBL) methods in clinical medical education are often hindered by limitations in scalability and student engagement. In response, interactive video-based CBL integrates decision tree scenarios wit…
View article: Brillouin super-cooling/heating in a non-Hermitian phononic dimer
Brillouin super-cooling/heating in a non-Hermitian phononic dimer Open
The ability to coherently manipulate phonons through light permits cooling and heating microscale quantum systems for various critical fields in metrology, information processing, and sensing. However, these physical systems often are hard…
View article: The correlation between the grayscale value of a digital radiography image and the optical density value of a laser-printed photograph
The correlation between the grayscale value of a digital radiography image and the optical density value of a laser-printed photograph Open
View article: High-Dimensional Quantum Key Distribution by a Spin-Orbit Microlaser
High-Dimensional Quantum Key Distribution by a Spin-Orbit Microlaser Open
Quantum key distribution offers a promising avenue for establishing secure communication networks. However, its performance is significantly hampered by the conventional two-level information carriers (i.e., qubits) due to their limited in…
View article: DIME:Diffusion-Based Maximum Entropy Reinforcement Learning
DIME:Diffusion-Based Maximum Entropy Reinforcement Learning Open
Maximum entropy reinforcement learning (MaxEnt-RL) has become the standard approach to RL due to its beneficial exploration properties. Traditionally, policies are parameterized using Gaussian distributions, which significantly limits thei…
View article: Probing non-Hermitian zero modes in a nanophotonic trimer: From nonuniform to twisted coupling
Probing non-Hermitian zero modes in a nanophotonic trimer: From nonuniform to twisted coupling Open
Topological lasers based on optical cavity arrays, such as the Su-Schrieffer-Heeger array, in active media were recently realized on various platforms. In all these studies the coupling coefficient between any adjacent sites of the lattice…
View article: Non-Hermitian gauged reciprocity and symmetry
Non-Hermitian gauged reciprocity and symmetry Open
The Lorentz reciprocity is a fundamental property in electromagnetism and well known to break down due to an external magnetic field. With a fictitious or imaginary vector potential, however, its behavior is largely unknown. Here we show t…
View article: Storing light near an exceptional point
Storing light near an exceptional point Open
View article: Three-dimensional polarization-dependent full-wavelength beam splitter written by femtosecond laser in LiNbO <sub>3</sub> crystal
Three-dimensional polarization-dependent full-wavelength beam splitter written by femtosecond laser in LiNbO <sub>3</sub> crystal Open
We report on the fabrication of Y-branched waveguide beam splitters with cladding structures in LiNbO 3 crystal by direct femtosecond laser writing. The femtosecond laser writes tracks near the surface of the crystal, constructing a square…
View article: Integrated preparation and manipulation of high-dimensional flying structured photons
Integrated preparation and manipulation of high-dimensional flying structured photons Open
The hope for a futuristic global quantum internet that provides robust and high-capacity quantum information transfer lies largely on qudits, the fundamental quantum information carriers prepared in high-dimensional superposition states. H…
View article: Variational Distillation of Diffusion Policies into Mixture of Experts
Variational Distillation of Diffusion Policies into Mixture of Experts Open
This work introduces Variational Diffusion Distillation (VDD), a novel method that distills denoising diffusion policies into Mixtures of Experts (MoE) through variational inference. Diffusion Models are the current state-of-the-art in gen…
View article: Enhanced Frequency Conversion in Parity-Time Symmetry Line
Enhanced Frequency Conversion in Parity-Time Symmetry Line Open
Non-Hermitian degeneracies reveal intriguing and non-trivial behaviors in open physical systems. Examples like Parity-Time (PT) symmetry breaking, topological encircling chirality, and enhanced sensing near an exceptional point (EP) are of…
View article: Three-dimensional polarization-dependent full-wavelength beam splitter written by femtosecond laser in LiNbO3 crystal
Three-dimensional polarization-dependent full-wavelength beam splitter written by femtosecond laser in LiNbO3 crystal Open
We report on the fabrication of Y-branched waveguide beam splitters with cladding structures in LiNbO3 crystal by direct femtosecond laser writing. The femtosecond laser writes tracks near the surface of the crystal, constructing a square …
View article: Three-dimensional polarization-dependent full-wavelength beam splitter written by femtosecond laser in LiNbO3 crystal
Three-dimensional polarization-dependent full-wavelength beam splitter written by femtosecond laser in LiNbO3 crystal Open
We report on the fabrication of Y-branched waveguide beam splitters with cladding structures in LiNbO3 crystal by direct femtosecond laser writing. The femtosecond laser writes tracks near the surface of the crystal, constructing a square …
View article: High-performance femtosecond-laser microfabricated lattice-like-cladding waveguides in Er3+ and MgO co-doped LiNbO3 crystals for multi-wavelength guidance and luminescence
High-performance femtosecond-laser microfabricated lattice-like-cladding waveguides in Er3+ and MgO co-doped LiNbO3 crystals for multi-wavelength guidance and luminescence Open
We report on microfabrication of the straight and S-shaped waveguides with lattice-like-cladding structures in Er3+ and MgO co-doped LiNbO3 by femtosecond laser writing. The waveguides with so-called Type II geometry support fundamental-mo…
View article: Subwavelength Photorefractive Grating in a Thin‐Film Lithium Niobate Microcavity
Subwavelength Photorefractive Grating in a Thin‐Film Lithium Niobate Microcavity Open
Subwavelength gratings play a fundamental and pivotal role in numerous science and applications for wave manipulation, exhibiting distinctive features such as filtering, phase manipulation, and anti‐reflection. However, conventional fabric…
View article: Non-Hermitian Systems with a Real Spectrum and Selective Skin Effect
Non-Hermitian Systems with a Real Spectrum and Selective Skin Effect Open
In this work, we first show a simple approach to constructing non-Hermitian Hamiltonians with a real spectrum, which are not obtained by a non-unitary transformation such as the imaginary gauge transformation. They are given, instead, by t…
View article: Summary and Reflection on the Teaching of Functions in Calculus for Economics and Management
Summary and Reflection on the Teaching of Functions in Calculus for Economics and Management Open
This article takes the research object of calculus - functions as the starting point, sorts out the manifestation of composite functions in various operation stages of calculus, summarizes the diversity of function forms, proposes teaching…
View article: Effective size of a parity-time symmetric dimer
Effective size of a parity-time symmetric dimer Open
Parity-time (PT) symmetric dimers were introduced to highlight the unusual properties of non-Hermitian systems that are invariant after a combined parity and time reversal operation. They are also the building blocks of a variety of symmet…
View article: High-Performance Femtosecond-Laser Microfabricated Waveguides in Er3+ and Mgo Co-Doped Linbo3 Crystals for Mid- and Near-Infrared Spectral Regimes
High-Performance Femtosecond-Laser Microfabricated Waveguides in Er3+ and Mgo Co-Doped Linbo3 Crystals for Mid- and Near-Infrared Spectral Regimes Open
View article: Tracking exceptional points above the lasing threshold
Tracking exceptional points above the lasing threshold Open
Recent studies on exceptional points (EPs) in non-Hermitian optical systems have revealed unique traits, including unidirectional invisibility, chiral mode switching and laser self-termination. In systems featuring gain/loss components, EP…
View article: Robust zero modes in non-Hermitian systems without global symmetries
Robust zero modes in non-Hermitian systems without global symmetries Open
We present an approach to achieve zero modes in lattice models that do not rely on any symmetry or topology of the bulk, which are robust against disorder in the bulk of any type and strength. Such symmetry-free zero modes (SFZMs) are form…
View article: Time Variation of Fine-Structure Constant Constrained by [O III] Emission-Lines at 1.1
Time Variation of Fine-Structure Constant Constrained by [O III] Emission-Lines at 1.1 Open
[O III]$λλ$4960,5008 doublet are often the strongest narrow emission lines in starburst galaxies and quasi-stellar objects (QSOs), and thus are a promising probe to possible variation of the fine-structure constant $α$ over cosmic time. Pr…
View article: Time variation of fine-structure constant constrained by [O <scp>iii</scp>] emission-lines at 1.1 &lt; <i>z</i> &lt; 3.7
Time variation of fine-structure constant constrained by [O <span>iii</span>] emission-lines at 1.1 < <i>z</i> < 3.7 Open
[O iii] λλ4960,5008 doublet are often the strongest narrow emission lines in starburst galaxies and quasi-stellar objects (QSOs), and thus are a promising probe to possible variation of the fine-structure constant α over cosmic time. Previ…
View article: Linear Localization of Zero Modes in Weakly Coupled Non‐Hermitian Reservoirs
Linear Localization of Zero Modes in Weakly Coupled Non‐Hermitian Reservoirs Open
Topological and symmetry‐protected non‐Hermitian zero modes have attracted considerable interest in the past few years. Here, it is revealed that they can exhibit an unusual behavior when transitioning between the extended and localized re…
View article: Non-Hermitian gauged laser arrays with localized excitations: Anomalous threshold and generalized principle of selective pumping
Non-Hermitian gauged laser arrays with localized excitations: Anomalous threshold and generalized principle of selective pumping Open
We investigate non-Hermitian skin modes in laser arrays with spatially localized excitation. Intriguingly, we observe an unusual threshold behavior when selectively pumping either the head or the tail of these modes: both cases exhibit the…
View article: Analysis of Dirac exceptional points and their isospectral Hermitian counterparts
Analysis of Dirac exceptional points and their isospectral Hermitian counterparts Open
Recently, a Dirac exceptional point (EP) was reported in a non-Hermitian system. Unlike a Dirac point in Hermitian systems, this Dirac EP has coalesced eigenstates in addition to the degenerate energy. Also different from a typical EP, the…