Publications (39)
Equivalence Classes of Colorings
Jun Ge, Slavik Jablan, Louis H. Kauffman +1
For any link and for any modulus we introduce an equivalence relation on the set of non-trivial m-colorings of the link (an m-coloring has values in Z/mZ). Given a diagram of t…
Rethinking Few-Shot Medical Image Segmentation by SAM2: A Training-Free Framework with Augmentative Prompting and Dynamic Matching
Haiyue Zu, Jun Ge, Heting Xiao +8
The reliance on large labeled datasets presents a significant challenge in medical image segmentation. Few-shot learning offers a potential solution, but existing methods often sti…
Time-reversal symmetry breaking superconductivity with electronic glass in nickelate (La, Pr, Sm)3Ni2O7 films
Haoran Ji, Zheyuan Xie, Yaqi Chen +11
The discovery of Ruddlesden-Popper (R-P) nickelate superconductors under high pressure heralds a new chapter of high-transition temperature (high-Tc) superconductivity. Recently, a…
Some new results on bar visibility of digraphs
Yuanrui Feng, Jun Ge, Douglas B. West +1
Visibility representation of digraphs was introduced by Axenovich, Beveridge, Hutch\-inson, and West (\emph{SIAM J. Discrete Math.} {\bf 27}(3) (2013) 1429--1449) as a natural gene…
Feature Selection Based on Orthogonal Constraints and Polygon Area
Zhenxing Zhang, Jun Ge, Zheng Wei +2
The goal of feature selection is to choose the optimal subset of features for a recognition task by evaluating the importance of each feature, thereby achieving effective dimension…
Minimal sufficient sets of colors and minimum number of colors
Jun Ge, Xian'an Jin, Louis H. Kauffman +2
In this paper we first investigate minimal sufficient sets of colors for p=11 and 13. For odd prime p and any p-colorable link L with non-zero determinant, we give alternative proo…
Tunable discrete scale invariance in transition-metal pentatelluride flakes
Yanzhao Liu, Huichao Wang, Haipeng Zhu +9
Log-periodic quantum oscillations discovered in transition-metal pentatelluride give a clear demonstration of discrete scale invariance (DSI) in solid-state materials. The peculiar…
Spectral radius and Hamiltonian properties of graphs
Bo Ning, Jun Ge
Let be a graph with minimum degree . The spectral radius of , denoted by , is the largest eigenvalue of the adjacency matrix of . In this note we mainly prove…
Magnetization-tuned topological quantum phase transition in MnBi2Te4 devices
Jun Ge, Yanzhao Liu, Pinyuan Wang +7
Recently, the intrinsic magnetic topological insulator MnBi2Te4 has attracted enormous research interest due to the great success in realizing exotic topological quantum states, su…
Phase-coherent asynchronous optical sampling system
Honglei Yang, Shengkang Zhang, Huan Zhao +1
Mutual phase coherence is the most crucial factor in asynchronous optical sampling system, and its enhancement is commonly achieved by phase-locking both femtosecond lasers to a sh…
Anomalous magneto-thermoelectric behavior in massive Dirac materials
Yanan Li, Huichao Wang, Jingyue Wang +15
Extensive studies of electron transport in Dirac materials have shown positive magneto-resistance (MR) and positive magneto-thermopower (MTP) in a magnetic field perpendicular to t…
High-Chern-Number and High-Temperature Quantum Hall Effect without Landau Levels
Jun Ge, Yanzhao Liu, Jiaheng Li +5
The quantum Hall effect (QHE) with quantized Hall resistance of h/νe2 starts the research on topological quantum states and lays the foundation of topology in physics. Afterwards,…
On enumeration of spanning trees of complete multipartite graphs containing a fixed spanning forest
Wei Wang, Jun Ge
We present a determinantal formula for the number of spanning trees of a complete multipartite graph containing a given spanning forest . Our approach relies on the Generalized…
Charge-4e and charge-6e flux quantization and higher charge superconductivity in kagome superconductor ring devices
Jun Ge, Pinyuan Wang, Ying Xing +6
The flux quantization is a key indication of electron pairing in superconductors. For example, the well-known h/2e flux quantization is considered strong evidence for the existence…
Eightfold Fermionic Excitation in a Charge Density Wave Compound
Xi Zhang, Qiangqiang Gu, Haigen Sun +19
Unconventional quasiparticle excitations in condensed matter systems have become one of the most important research frontiers. Beyond two- and fourfold degenerate Weyl and Dirac fe…
Counting spanning trees in a complete bipartite graph which contain a given spanning forest
Fengming Dong, Jun Ge
In this article, we extend Moon's classic formula for counting spanning trees in complete graphs containing a fixed spanning forest to complete bipartite graphs. Let be the…
Confucius Code Agent: Scalable Agent Scaffolding for Real-World Codebases
Sherman Wong, Zhenting Qi, Zhaodong Wang +8
Real-world software engineering tasks require coding agents that can operate on massive repositories, sustain long-horizon sessions, and reliably coordinate complex toolchains at t…
Super-efficient optical frequency division referenced to μHz Schawlow-Townes-linewidth quantum-noise-limited lasers
Jiahao Hu, Yanlan Xiao, Honglei Yang +12
Optical frequency division (OFD) implements the conversion of ultra-stable optical frequencies into microwave frequencies through an optical frequency comb flywheel, generating mic…
Unconventional Hall Effect induced by Berry Curvature
Jun Ge, Da Ma, Yanzhao Liu +10
Berry phase and Berry curvature play a key role in the development of topology in physics and do contribute to the transport properties in solid state systems. In this paper, we re…
When will the crossing number of an alternating link decrease by two via a crossing change?
Xian'an Jin, Fuji Zhang, Jun Ge
Let be a reduced alternating diagram of a non-split link and be the link whose diagram is obtained from by a crossing change. If is alternating,…
A Preliminary Study on Explaining Risk of Code Changes using LLM-Based Prediction Models
Yalin Liu, Kosay Jabre, Rui Abreu +10
Predictions by machine learning (ML) and artificial intelligence (AI) models are often received skeptically unless they are paired with intelligible explanations. In the context of…
Nonreciprocal superconducting critical currents with normal state field trainability in kagome superconductor CsV3Sb5
Jun Ge, Xiaoqi Liu, Pinyuan Wang +5
Determining time-reversal symmetry (TRS) and chirality in the superconducting state and its relation to normal-state symmetry and topology are important issues in condensed matter…
Spectral radius and Hamiltonian properties of graphs, II
Jun Ge, Bo Ning
In this paper, we first present spectral conditions for the existence of in graphs (2-connected graphs) of order , which are motivated by a conjecture of ErdÅs. Then…
Spanning trees in complete bipartite graphs and resistance distance in nearly complete bipartite graphs
Jun Ge, Fengming Dong
Using the theory of electrical network, we first obtain a simple formula for the number of spanning trees of a complete bipartite graph containing a certain matching or a certain t…
Demonstration of robust chiral edge transport in Chern insulator MnBi2Te4 devices with engineered geometric defects
Pinyuan Wang, Jun Ge, Jiawei Luo +4
Chiral edge states in Chern insulators are theoretically predicted to propagate unidirectionally along the sample boundary with inherent robustness against local perturbations, whi…
Intrinsic magnetic topological insulators
Pinyuan Wang, Jun Ge, Jiaheng Li +3
Introducing magnetism into topological insulators breaks time-reversal symmetry, and the magnetic exchange interaction can open a gap in the otherwise gapless topological surface s…
Induced anomalous Hall effect of massive Dirac fermions in ZrTe5 and HfTe5 thin flakes
Yanzhao Liu, Huichao Wang, Huixia Fu +8
Researches on anomalous Hall effect (AHE) have been lasting for a century to make clear the underlying physical mechanism. Generally, the AHE appears in magnetic materials, in whic…
Surface Superconductivity in the type II Weyl Semimetal TaIrTe4
Ying Xing, Zhibin Shao, Jun Ge +12
The search for unconventional superconductivity in Weyl semimetal materials is currently an exciting pursuit, since such superconducting phases could potentially be topologically n…
Express the number of spanning trees in term of degrees
Fengming Dong, Jun Ge, Zhangdong Ouyang
It is well-known that the number of spanning trees, denoted by , in a connected multi-graph can be calculated by the Matrix-Tree theorem and Tutte's deletion-contraction…
Upper bounds on the signed edge domination number of a graph
Fengming Dong, Jun Ge, Yan Yang
A signed edge domination function (or SEDF) of a simple graph is a function such that holds for each edge $e\in E…
Contactless Probing of the Intrinsic Carrier Transport in Single-Walled Carbon Nanotubes
Yize Stephanie Li, Jun Ge, Jinhua Cai +4
Intrinsic carrier transport properties of single-walled carbon nanotubes are probed by two parallel methods on the same individual tubes: the contactless dielectric force microscop…
Low energy cluster beam deposited BN films as the cascade for Field Emission
Fengqi Song, Lu Zhang, Lianzhong Zhu +2
The atomic deposited BN films with the thickness of nanometers (ABN) were prepared by radio frequency magnetron sputtering method and the nanostructured BN films (CBN) were prepare…
Extrinsic and Intrinsic Anomalous Metallic States in Transition Metal Dichalcogenide Ising Superconductors
Ying Xing, Pu Yang, Jun Ge +14
The metallic ground state in two-dimensional (2D) superconductors has attracted much attention but is still under intense scrutiny. Especially, the measurements in ultralow tempera…
Proving a conjecture on chromatic polynomials by counting the number of acyclic orientations
Fengming Dong, Jun Ge, Helin Gong +3
The chromatic polynomial of a graph of order can be expressed as , where is interpreted as the number of broken-cycle…
The bipartite analogue of a classical spanning tree enumeration formula, Boolean functions, and their applications to counting odd spanning trees
Jun Ge, Yamin Yu
Recently, Zheng and Wu defined the concept of odd spanning tree of a graph, meaning a spanning tree in which every vertex has odd degree. Similar to Cayley's formula, Feng, Chen an…
Moving Faster and Reducing Risk: Using LLMs in Release Deployment
Rui Abreu, Vijayaraghavan Murali, Peter C Rigby +7
Release engineering has traditionally focused on continuously delivering features and bug fixes to users, but at a certain scale, it becomes impossible for a release engineering te…
High-temperature field-free superconducting diode effect in high-Tc cuprates
Shichao Qi, Jun Ge, Chengcheng Ji +7
The superconducting diode effect (SDE) is defined by the difference in the magnitude of critical currents applied in opposite directions. It has been observed in various supercondu…
Ferromagnetic and insulating behavior in both half magnetic levitation and non-levitation LK-99 like samples
Pinyuan Wang, Xiaoqi Liu, Jun Ge +7
Finding materials exhibiting superconductivity at room temperature has long been one of the ultimate goals in physics and material science. Recently, room-temperature superconducti…
Rainbow C_4's and Directed C_4's: the Bipartite Case Study
Bo Ning, Jun Ge
In this paper we obtain a new sufficient condition for the existence of directed cycles of length 4 in oriented bipartite graphs. As a corollary, a conjecture of H. Li is confirmed…