Publications (53)
Experimental observation of dynamical bulk-surface correspondence for topological phases
Ya Wang, Wentao Ji, Zihua Chai +12
We experimentally demonstrate a dynamical classification approach for investigation of topological quantum phases using a solid-state spin system through nitrogen-vacancy (NV) cent…
Nilpotent center conditions in cubic switching polynomial Liénard systems by higher-order analysis
Ting Chen, Feng Li, Pei Yu
The aim of this paper is to investigate two classical problems related to nilpotent center conditions and bifurcation of limit cycles in switching polynomial systems. Due to the di…
An efficient solution procedure for solving higher-codimension Hopf and Bogdanov-Takens bifurcations
Bing Zeng, Pei Yu, Maoan Han
In solving real world systems for higher-codimension bifurcation problems, one often faces the difficulty in computing the normal form or the focus values associated with generaliz…
The Overlooked Classifier in Human-Object Interaction Recognition
Ying Jin, Yinpeng Chen, Lijuan Wang +5
Human-Object Interaction (HOI) recognition is challenging due to two factors: (1) significant imbalance across classes and (2) requiring multiple labels per image. This paper shows…
GOE statistics in graphene billiards with the shape of classically integrable billiards
Pei Yu, Zi-Yuan Li, Hong-Ya Xu +4
A crucial result in quantum chaos, which has been established for a long time, is that the spectral properties of classically integrable systems generically are described by Poisso…
Excited-state spectroscopy of spin defects in hexagonal boron nitride
Pei Yu, Haoyu Sun, Mengqi Wang +8
We used optically detected magnetic resonance (ODMR) technique to directly probe electron-spin resonance transitions in the excited state of negatively-charged boron vacancy (VB-)…
Impact of delay on HIV-1 dynamics of fighting a virus with another virus
Yun Tian, Yu Bai, Pei Yu
In this paper, we propose a mathematical model for HIV-1 infection with intracellular delay. The model examines a viral-therapy for controlling infections through recombining HIV-1…
Observation of uniaxial strain tuned spin cycloid in a freestanding BiFeO3 film
Zhe Ding, Yumeng Sun, Ningchong Zheng +10
Non-collinear spin order that breaks space inversion symmetry and allows efficient electric-field control of magnetism makes BiFeO a promising candidate for applications in low…
Center and isochronous center of a class of quasi-analytic switching systems
Feng Li, Pei Yu, Yirong Liu +1
In this paper, we study the integrability and linearization of a class of quadratic quasi-analytic switching systems. We improve an existing method to compute the focus values and…
Room-temperature coherent control of implanted defect spins in silicon carbide
Fei-Fei Yan, Ai-Lun Yi, Jun-Feng Wang +9
Recently, vacancy-related spin defects in silicon carbide (SiC) have been demonstrated to be potentially suitable for versatile quantum interface building and scalable quantum netw…
Beating the Standard Quantum Limit under Ambient Conditions with Solid-State Spins
Tianyu Xie, Zhiyuan Zhao, Xi Kong +10
Precision measurement plays a crucial role in all fields of science. The use of entangled sensors in quantum metrology improves the precision limit from the standard quantum limit…
Visualization of Four Limit Cycles in Near-Integrable Quadratic Polynomial Systems
Pei Yu, Yanni Zeng
It has been known for almost years that general planar quadratic polynomial systems can have four limit cycles. Recently, four limit cycles were also found in near-integrable…
Bi-center conditions and bifurcation of limit cycles in a class of -equivariant cubic switching systems with two nilpotent points
Ting Chen, Feng Li, Yun Tian +1
In this paper, we generalize the Poincaré-Lyapunov method for systems with linear type centers to study nilpotent centers in switching polynomial systems and use it to investigate…
Picotesla magnetometry of microwave fields with diamond sensors
Zhecheng Wang, Fei Kong, Pengju Zhao +5
Developing robust microwave-field sensors is both fundamentally and practically important with a wide range of applications from astronomy to communication engineering. The Nitroge…
SA-VQA: Structured Alignment of Visual and Semantic Representations for Visual Question Answering
Peixi Xiong, Quanzeng You, Pei Yu +2
Visual Question Answering (VQA) attracts much attention from both industry and academia. As a multi-modality task, it is challenging since it requires not only visual and textual u…
A Unified Transferable Model for ML-Enhanced DBMS
Ziniu Wu, Pei Yu, Peilun Yang +6
Recently, the database management system (DBMS) community has witnessed the power of machine learning (ML) solutions for DBMS tasks. Despite their promising performance, these exis…
Structural analysis of nuclear spin clusters via two-dimensional nanoscale nuclear magnetic resonance spectroscopy
Zhiping Yang, Xi Kong, Zhijie Li +9
Two-dimensional Nuclear Magnetic Resonance (NMR) is essential in molecular structure determination. The Nitrogen-Vacancy (NV) center in diamond has been proposed and developed as a…
Four limit cycles from perturbing quadratic integrable systems by quadratic polynomials
Pei Yu, Maoan Han
In this paper, we give a positive answer to the open question: Can there exist 4 limit cycles in quadratic near-integrable polynomial systems? It is shown that when a quadratic int…
Quantum relaxometry for detecting biomolecular interactions with single NV centers
Min Li, Qi Zhang, Xi Kong +14
The investigation of biomolecular interactions at the single-molecule level has emerged as a pivotal research area in life science, particularly through optical, mechanical, and el…
Nanoscale zero-field electron spin resonance spectroscopy
Fei Kong, Pengju Zhao, Xiangyu Ye +6
Electron spin resonance (ESR) spectroscopy has broad applications in physics, chemistry and biology. As a complementary tool, zero-field ESR (ZF-ESR) spectroscopy has been proposed…
Improving Muon-Scattering Material Identification via Coarse Momentum Encoding and Unsupervised Domain Adaptation
Yuxin Bao, Zhao Zhang, Pei Yu +7
Cosmic-ray muon scattering has shown considerable potential for detecting nuclear materials and other dense contraband, but practical deployment remains challenging. A major diffic…
Exploring the lifetime frontier with a beam-dump experiment at CiADS
Liangwen Chen, Mingxuan Du, Zhiyu Sun +6
We propose a beam-dump experiment (BDE) at the upcoming facility of China initiative Accelerator Driven System (CiADS), called CiADS-BDE, in order to search for long-lived particle…
Terphenylthiazole-based self-assembled monolayers on cobalt with high conductance photo-switching ratio for spintronics
Vladimir Prudkovskiy, Imane Arbouch, Anne Léaustic +7
Two new photo-switchable terphenylthiazoles molecules are synthesized and self-assembled as monolayers on Au and on ferromagnetic Co electrodes. The electron transport properties p…
Bifurcation of ten small-amplitude limit cycles by perturbing a quadratic Hamiltonian system
Yun Tian, Pei Yu
This paper contains two parts. In the first part, we shall study the Abelian integrals for Zoladek's example [13], in which it is claimed the existence integrals of 11 small-amplit…
Temperature-dependent behaviors of single spin defects in solids determined with Hz-level precision
Shaoyi Xu, Mingzhe Liu, Tianyu Xie +6
Revealing the properties of single spin defects in solids is essential for quantum applications based on solid-state systems. However, it is intractable to investigate the temperat…
Unsupervised Domain Adaptation for Object Detection via Cross-Domain Semi-Supervised Learning
Fuxun Yu, Di Wang, Yinpeng Chen +7
Current state-of-the-art object detectors can have significant performance drop when deployed in the wild due to domain gaps with training data. Unsupervised Domain Adaptation (UDA…
Improving Vision Transformers for Incremental Learning
Pei Yu, Yinpeng Chen, Ying Jin +1
This paper proposes a working recipe of using Vision Transformer (ViT) in class incremental learning. Although this recipe only combines existing techniques, developing the combina…
The spectral sequences and parametric normal forms
Majid Gazor, Pei Yu
We generalize recent developments on normal forms and the spectral sequences method to make a foundation for parametric normal forms. We further introduce a new style and costyle t…
Improving Muon Scattering Tomography Performance With A Muon Momentum Measurement Scheme
Pei Yu, Ziwen Pan, Jiajia Zhai +10
Muon imaging, especially muon scattering tomography (MST), has recently garnered significant attention. MST measures the magnitude of muon scattering angles inside an object, which…
Super-resolution Localization of Nitrogen Vacancy Centers in Diamond with Quantum Controlled Photoswitching
Pengfei Wang, You Huang, Maosen Guo +7
We demonstrate the super-resolution localization of the nitrogen vacancy centers in diamond by a novel fluorescence photoswitching technique based on coherent quantum control. The…
Backward bifurcation underlies rich dynamics in simple disease models
Wenjing Zhang, Pei Yu, Lindi M. Wahl
In this paper, dynamical systems theory and bifurcation theory are applied to investi- gate the rich dynamical behaviours observed in three simple disease models. The 2- and 3-dime…
The Feasibility Study of the GeV-Energy Muon Source Based on HIAF
Yu Xu, Xueheng Zhang, Yuhong Yu +13
Generating a mono-energetic, high-energy muon beam using accelerator facilities can be very attractive for many purposes, for example, improving muon tomography currently limited b…
A Token-level Contrastive Framework for Sign Language Translation
Biao Fu, Peigen Ye, Liang Zhang +4
Sign Language Translation (SLT) is a promising technology to bridge the communication gap between the deaf and the hearing people. Recently, researchers have adopted Neural Machine…
A simple criterion for identifying slow-fast relaxation oscillations
Lucas MacQuarrie, Pei Yu
Simple conditions have been developed in [Zhang, Wahl and Yu, SIAM Rev. 2014; Yu and Wang, Math. Biosci. Eng. 2019], which are used to identify the existence of slow-fast relaxatio…
Projection-shifted particle-flow imaging with cosmic-ray muons
Zibo Qin, Rongfeng Zhang, Pei Yu +6
Cosmic-ray muons are natural probes for non-destructive imaging, but reaching sub-millimetre resolution with realistic exposure times has long been hindered by a fundamental limita…
U-Net Based Image Enhancement for Short-time Muon Scattering Tomography
Haochen Wang, Pei Yu, Liangwen Chen +6
Muon Scattering Tomography (MST) is a promising non-invasive inspection technique, yet the practical application of short-time MST is hindered by poor image quality due to limited…
Self-aligned patterning technique for fabricating high-performance diamond sensor arrays with nanoscale precision
Mengqi Wang, Haoyu Sun, Xiangyu Ye +7
To efficiently align the creation of defect center with photonics structure in nanoscale precision is one of the outstanding challenges for realizing high-performance photonic devi…
Sensing orbital hybridization of graphene-diamond interface with a single spin
Yucheng Hao, Zhiping Yang, Zeyu Li +13
Interfacial interactions are crucial in a variety of fields and can greatly affect the electric, magnetic, and chemical properties of materials. Among them, interface orbital hybri…
Bifurcation of small limit cycles in cubic integrable systems using higher-order analysis
Yun Tian, Pei Yu
In this paper, we present a method of higher-order analysis on bifurcation of small limit cycles around an elementary center of integrable systems under perturbations. This method…
New Constraints on Exotic Spin-Spin-Velocity-Dependent Interactions with Solid-State Quantum Sensors
Yue Huang, Hang Liang, Man Jiao +8
We report new experimental results on exotic spin-spin-velocity-dependent interactions between electron spins. We designed an elaborate setup that is equipped with two nitrogen-vac…
Kilohertz electron paramagnetic resonance spectroscopy of single nitrogen centers at zero magnetic field
Fei Kong, Pengju Zhao, Pei Yu +6
Electron paramagnetic resonance spectroscopy (EPR) is among the most important analytical tools in physics, chemistry, and biology. The emergence of nitrogen-vacancy (NV) centers i…
Imaging magnetism evolution of magnetite to megabar pressure range with quantum sensors in diamond anvil cell
Mengqi Wang, Yu Wang, Zhixian Liu +9
High-pressure diamond anvil cells have been widely used to create novel states of matter. Nevertheless, the lack of universal in-situ magnetic measurement techniques at megabar pre…
Correlated sensing with a solid-state quantum multi-sensor system for atomic-scale structural analysis
Wentao Ji, Zhaoxin Liu, Yuhang Guo +10
Developing superior quantum sensing strategies ranging from ultra-high precision measurement to complex structural analysis is at the heart of quantum technologies. While strategie…
Transfer learning empowers material Z classification with muon tomography
Haochen Wang, Zhao Zhang, Pei Yu +12
Cosmic-ray muon sources exhibit distinct scattering angle distributions when interacting with materials of different atomic numbers (Z values), facilitating the identification of v…
Is Object Detection Necessary for Human-Object Interaction Recognition?
Ying Jin, Yinpeng Chen, Lijuan Wang +4
This paper revisits human-object interaction (HOI) recognition at image level without using supervisions of object location and human pose. We name it detection-free HOI recognitio…
The Overlooked Classifier in Human-Object Interaction Recognition
Ying Jin, Yinpeng Chen, Lijuan Wang +5
Human-Object Interaction (HOI) recognition is challenging due to two factors: (1) significant imbalance across classes and (2) requiring multiple labels per image. This paper shows…
Room-temperature hybrid 2D-3D quantum spin system for enhanced magnetic sensing and many-body dynamics
Haoyu Sun, Pei Yu, Xu Zhou +10
Advances in hybrid quantum systems and their precise control are pivotal for developing advanced quantum technologies. Two-dimensional (2D) materials with optically accessible spin…
Discovery of an anomalous non-evaporating sub-nanometre water layer in open environment
Zhijie Li, Xi Kong, Haoyu Sun +8
Water exhibits complex behaviors as a result of hydrogen bonding, and low-dimensional confined water plays a key role in material science, geology, and biology science. Conventiona…
Should All Proposals be Treated Equally in Object Detection?
Yunsheng Li, Yinpeng Chen, Xiyang Dai +7
The complexity-precision trade-off of an object detector is a critical problem for resource constrained vision tasks. Previous works have emphasized detectors implemented with effi…
Sub-nanotesla Sensitivity at the Nanoscale with a Single Spin
Zhiyuan Zhao, Xiangyu Ye, Shaoyi Xu +7
High-sensitivity detection of microscopic magnetic field is essential in many fields. Good sensitivity and high spatial resolution are mutually contradictory in measurement, which…
Determining codimension of Bogdanov-Takens and Bautin bifurcations via simplest normal form computation
Pei Yu, Yanni Zeng, Maoan Han
In solving real-world problems, determining the codimension of Bogdanov-Takens (BT) and Bautin (generalized Hopf) bifurcations can be very challenging, even for simple two-dimensio…
Oxygen-vacancy quantum spin defects in silicon carbide
Yu Chen, Qi Zhang, Mingzhe Liu +11
Optically addressable spin defects in wide-bandgap semiconductors are promising building blocks for quantum sensing and quantum networks. Establishing their atomic structure is ess…
Experimental Constraints on Exotic Spin-Dependent Interactions by a Magnetometer with Ensembles of Nitrogen-Vacancy Centers in Diamond
Hang Liang, Man Jiao, Yue Huang +7
Improved constraints on exotic spin-dependent interactions are established at the micrometer scale by a magnetometer with ensembles of nitrogen-vacancy (NV) centers in diamond. A t…