Publications (48)
Dynamic Trajectory and Power Control in Ultra-Dense UAV Networks: A Mean-Field Reinforcement Learning Approach
Fei Song, Zhe Wang, Jun Li +3
In ultra-dense unmanned aerial vehicle (UAV) networks, it is challenging to coordinate the resource allocation and interference management among large-scale UAVs, for providing fle…
Non-Hermitian Topological Invariants in Real Space
Fei Song, Shunyu Yao, Zhong Wang
The topology of non-Hermitian systems is drastically shaped by the non-Hermitian skin effect, which leads to the generalized bulk-boundary correspondence and non-Bloch band theory.…
Stable boundary modes for fragile topology from spontaneous PT-symmetry breaking
Kang Yang, Fei Song, Piet W. Brouwer
Two-dimensional topological insulators protected by nonlocal symmetries or with fragile topology usually do not admit robust in-gap edge modes due to the incompatibility between th…
Terahertz channel modeling based on surface sensing characteristics
Jiayuan Cui, Da Li, Jiabiao Zhao +7
The dielectric properties of environmental surfaces, including walls, floors and the ground, etc., play a crucial role in shaping the accuracy of terahertz (THz) channel modeling,…
Geometric Origin of Non-Bloch PT Symmetry Breaking
Yu-Min Hu, Hong-Yi Wang, Zhong Wang +1
The parity-time (PT) symmetry of a non-Hermitian Hamiltonian leads to real (complex) energy spectrum when the non-Hermiticity is below (above) a threshold. Recently, it has been de…
Strain-Tuned Nodal Superconductivity in the Charge-Ordered Kagome Metal CsVSb
Yusuke Takeuchi, Akito Kobayashi, Saki Uchida +8
The authors use Sb NQR to study how uniaxial tensile strain affects superconductivity in the kagome metal CsVSb, finding an enhanced and a strain‑induced doub…
Robust Surface Doping of BiSe by Rb Intercalation
Marco Bianchi, Richard C. Hatch, Zheshen Li +11
Rubidium adsorption on the surface of the topological insulator BiSe is found to induce a strong downward band bending, leading to the appearance of a quantum-confined two…
Measurement and Modeling on Terahertz Channel Propagation Through Vegetation
Jiayuan Cui, Yuheng Song, He Jiang +11
The terahertz band offers promising opportunities for high-capacity wireless communications but faces significant challenges from vegetation-induced channel impairments. This artic…
Non-Bloch dynamics and topology in a classical non-equilibrium process
Bo Li, He-Ran Wang, Fei Song +1
The non-Hermitian skin effect refers to the accumulation of eigenstates near the boundary in open boundary lattice models, which can be systematically characterized using the non-B…
Interventional Imbalanced Multi-Modal Representation Learning via -Generalization Front-Door Criterion
Yi Li, Fei Song, Changwen Zheng +3
Multi-modal methods establish comprehensive superiority over uni-modal methods. However, the imbalanced contributions of different modalities to task-dependent predictions constant…
Neural-based Modeling for Performance Tuning of Spark Data Analytics
Khaled Zaouk, Fei Song, Chenghao Lyu +1
Cloud data analytics has become an integral part of enterprise business operations for data-driven insight discovery. Performance modeling of cloud data analytics is crucial for pe…
Many-body Liouvillian dynamics with a non-Hermitian tensor-network kernel polynomial algorithm
Guangze Chen, Jose L. Lado, Fei Song
Understanding the dynamics of open quantum many-body systems is a major problem in quantum matter. Specifically, efficiently solving the spectrum of the Liouvillian superoperator g…
Amoeba Formulation of Non-Bloch Band Theory in Arbitrary Dimensions
Hong-Yi Wang, Fei Song, Zhong Wang
The non-Hermitian skin effect dramatically reshapes the energy bands of non-Hermitian systems, meaning that the usual Bloch band theory is fundamentally inadequate as their charact…
BayesPrompt: Prompting Large-Scale Pre-Trained Language Models on Few-shot Inference via Debiased Domain Abstraction
Jiangmeng Li, Fei Song, Yifan Jin +4
As a novel and effective fine-tuning paradigm based on large-scale pre-trained language models (PLMs), prompt-tuning aims to reduce the gap between downstream tasks and pre-trainin…
Probabilistic Topic and Syntax Modeling with Part-of-Speech LDA
William M. Darling, Fei Song
This article presents a probabilistic generative model for text based on semantic topics and syntactic classes called Part-of-Speech LDA (POSLDA). POSLDA simultaneously uncovers sh…
Orchestrating Data Collection and Computation in Green IoT Networks
Junfei Zhan, Tengjiao He, Kwan-Wu Chin +2
Future Internet of things (IoT) networks will host applications that involve data collection and computation tasks on one or more servers. To this end, this paper proposes the firs…
Majorana corner modes in a high-temperature platform
Zhongbo Yan, Fei Song, Zhong Wang
We introduce two-dimensional topological insulators in proximity to high-temperature cuprate or iron-based superconductors as high-temperature platforms of Majorana Kramers pairs o…
Scale-free non-Hermitian skin effect in a boundary-dissipated spin chain
He-Ran Wang, Bo Li, Fei Song +1
We study the open XXZ spin chain with a PT-symmetric non-Hermitian boundary field. We find an interaction-induced scale-free non-Hermitian skin effect by using the coordinate Bethe…
Solvable BCS-Hubbard Liouvillians in arbitrary dimensions
Xu-Dong Dai, Fei Song, Zhong Wang
We present the construction of a solvable Lindblad model in arbitrary dimensions, wherein the Liouvillian can be mapped to a BCS-Hubbard model featuring an imaginary interaction. T…
Probabilistic Caching for Small-Cell Networks with Terrestrial and Aerial Users
Fei Song, Jun Li, Ming Ding +5
The support for aerial users has become the focus of recent 3GPP standardizations of 5G, due to their high maneuverability and flexibility for on-demand deployment. In this paper,…
Fragile non-Bloch spectrum and unconventional Green's function
Fei Song, Hong-Yi Wang, Zhong Wang
In non-Hermitian systems, it is a counterintuitive feature of the non-Hermitian skin effect (NHSE) that the energy spectrum and eigenstates can be totally different under open or p…
Topological spin excitations in non-Hermitian spin chains with a generalized kernel polynomial algorithm
Guangze Chen, Fei Song, Jose L. Lado
Spectral functions of non-Hermitian Hamiltonians can reveal the existence of topologically non-trivial line gaps and the associated topological edge modes. However, the computation…
High-speed surface-property recognition by 140-GHz frequency
Jiacheng Liu, Da Li, Guohao Liu +5
In the field of integrated sensing and communication, there's a growing need for advanced environmental perception. The terahertz (THz) frequency band, significant for ultra-high-s…
A stabilized nonconforming Nitsche's extended finite element method for Stokes interface problems
Xiaoxiao He, Fei Song, Weibing Deng
In this paper, a stabilized extended finite element method is proposed for Stokes interface problems on unfitted triangulation elements which do not require the interface align wit…
Cellular-Base-Station Assisted Device-to-Device Communications in TV White Space
Guoru Ding, Jinlong Wang, Qihui Wu +3
This paper presents a systematic approach to exploit TV white space (TVWS) for device-to-device (D2D) communications with the aid of the existing cellular infrastructure. The goal…
Observation of non-Hermitian edge burst in quantum dynamics
Lei Xiao, Wen-Tan Xue, Fei Song +4
The non-Hermitian skin effect, by which the eigenstates of Hamiltonian are predominantly localized at the boundary, has revealed a strong sensitivity of non-Hermitian systems to th…
Theoretical Study on Recognition of Icy Road Surface Condition by Low-THz Frequencies
Xiangzhu Meng, Peian Li, Yuning Hu +2
Recognition of road surface conditions should always be at the forefront of intelligent transportation systems for the enhancement of transportation safety and efficiency. When roa…
Dynamic Virtual Resource Allocation for 5G and Beyond Network Slicing
Fei Song, Jun Li, Chuan Ma +3
The fifth generation and beyond wireless communication will support vastly heterogeneous services and use demands such as massive connection, low latency and high transmission rate…
Boosting Cloud Data Analytics using Multi-Objective Optimization
Fei Song, Khaled Zaouk, Chenghao Lyu +4
Data analytics in the cloud has become an integral part of enterprise businesses. Big data analytics systems, however, still lack the ability to take user performance goals and bud…
Non-Bloch PT symmetry breaking: Universal threshold and dimensional surprise
Fei Song, Hong-Yi Wang, Zhong Wang
In the presence of non-Hermitian skin effect, non-Hermitian lattices generally have complex-valued eigenenergies under periodic boundary condition, but they can have non-Bloch PT s…
Fine-Grained Modeling and Optimization for Intelligent Resource Management in Big Data Processing
Chenghao Lyu, Qi Fan, Fei Song +8
Big data processing at the production scale presents a highly complex environment for resource optimization (RO), a problem crucial for meeting performance goals and budgetary cons…
Non-Bloch edge dynamics of non-Hermitian lattices
Wen-Tan Xue, Fei Song, Yu-Min Hu +1
The non-Hermitian skin effect, i.e., the localization of nominally bulk modes, not only drastically reshapes the spectral properties of non-Hermitian systems, but also dramatically…
Terahertz channel power and BER performance in rain
Yuheng Song, Jiayuan Cui, Guohao Liu +9
Terahertz (THz) communications have emerged as a promising technology for 6G networks due to their potential for achieving terabit-per-second data rates. However, the impact of rai…
Phase Transition of single-layer vanadium diselenide on Au(111) with distinguished electronic structures
Jinbang Hu, Xiansi Wang, Chaoqin Huang +2
Herein, we report the reversible structural transition of single-layer VSe2 grown on Au(111) through alternating thermal annealing and Se replenishment. Using scanning tunneling mi…
A Practical Regularity Partitioning Algorithm and its Applications in Clustering
Gábor N. Sárközy, Fei Song, Endre Szemerédi +1
In this paper we introduce a new clustering technique called Regularity Clustering. This new technique is based on the practical variants of the two constructive versions of the Re…
Scale-free localization and PT symmetry breaking from local non-Hermiticity
Bo Li, He-Ran Wang, Fei Song +1
We show that a local non-Hermitian perturbation in a Hermitian lattice system generically induces scale-free localization for the continuous-spectrum eigenstates. When the perturba…
Non-Hermitian skin effect and chiral damping in open quantum systems
Fei Song, Shunyu Yao, Zhong Wang
One of the unique features of non-Hermitian Hamiltonians is the non-Hermitian skin effect, namely that the eigenstates are exponentially localized at the boundary of the system. Fo…
Modeling of Multipath Transport
Chang Liu, Fei Song, Huan Yan +1
In this paper, we propose a model for evaluating the transmission performance of multipath transport. Previous researches focused exclusively on single pair users in simple scenari…
Non-Hermitian Chern bands
Shunyu Yao, Fei Song, Zhong Wang
The relation between chiral edge modes and bulk Chern numbers of quantum Hall insulators is a paradigmatic example of bulk-boundary correspondence. We show that the chiral edge mod…
Steady-state edge burst: From free-particle systems to interaction-induced phenomena
Yu-Min Hu, Wen-Tan Xue, Fei Song +1
The interplay between the non-Hermitian skin effect and the imaginary gap of lossy lattices results in the edge burst, a boundary-induced dynamical phenomenon in which an exception…
Doubly Debiased Test-Time Prompt Tuning for Vision-Language Models
Fei Song, Yi Li, Rui Wang +3
Test-time prompt tuning for vision-language models has demonstrated impressive generalization capabilities under zero-shot settings. However, tuning the learnable prompts solely ba…
Non-Hermitian Edge Burst
Wen-Tan Xue, Yu-Min Hu, Fei Song +1
We unveil an unexpected non-Hermitian phenomenon, dubbed edge burst, in non-Hermitian quantum dynamics. Specifically, in a class of non-Hermitian quantum walk in periodic lattices…
AmPLe: Supporting Vision-Language Models via Adaptive-Debiased Ensemble Multi-Prompt Learning
Fei Song, Yi Li, Jiangmeng Li +4
Multi-prompt learning methods have emerged as an effective approach for facilitating the rapid adaptation of vision-language models to downstream tasks with limited resources. Exis…
Simple formulas of directional amplification from non-Bloch band theory
Wen-Tan Xue, Ming-Rui Li, Yu-Min Hu +2
Green's functions are fundamental quantities that determine the linear responses of physical systems. The recent developments of non-Hermitian systems, therefore, call for Green's…
Exathlon: A Benchmark for Explainable Anomaly Detection over Time Series
Vincent Jacob, Fei Song, Arnaud Stiegler +3
Access to high-quality data repositories and benchmarks have been instrumental in advancing the state of the art in many experimental research domains. While advanced analytics tas…
The Principle of Isomorphism: A Theory of Population Activity in Grid Cells and Beyond
Maoshen Xu, Fei Song, Bailu Si +1
Neural population activity organizes into low-dimensional manifolds embedded within high-dimensional state spaces, yet the principles governing the topology and geometry of these m…
Fidelity susceptibility and quantum Fisher information for density operators with arbitrary ranks
Jing Liu, Heng-Na Xiong, Fei Song +1
Taking into account the density matrices with non-full ranks, we show that the fidelity susceptibility is determined by the support of the density matrix. Combining with the corres…
Boundary-sensitive non-Hermiticity of Floquet Hamiltonian: spectral transition and scale-free localization
Bo Li, He-Ran Wang, Fei Song
We report a novel mechanism of boundary-sensitive PT symmetry breaking in one-dimensional Floquet systems. By designing a time-periodic driving protocol, we realize a Floquet Hamil…