Yang Li
Professor in Physics
University of Science and Technology of China
Contact
 Office: C1202, Material Science Research Bldg, East Campus
 Telephone:
 Email: leeyoung1987(at)ustc.edu.cn
 Address: Department of Modern Physics, University of Science and Technology of China, 96 Jinzhai Rd., Hefei, 230026, China
Interests
NonPerturbative QCD, Hadronic Physics and Computational PhysicsThe HighEnergy Nuclear Theory Group
What's new
20232024 ILCAC Seminars (third Wednesdays, 13:30 GMT/21:30 BJT). This seminar series focuses on physics of strongly interacting particles and related issues.
20232024 LFQCD Seminars (first Wednesday, 13:00 GMT/21:00 BJT). This seminar series is a platform for earlycareer researchers to present their recent work and to exchange ideas on nonperturbative aspects of QCD, especially on lightfront QCD and hadron structures.
Teaching & Advising
Lectures
 Spring 2024, Introduction to Nuclear Physics
Lecture Slides (English):
Chapter 41: Introduction to radioactivity and nuclear decay
Chapter 42: alpha decay
Chapter 43: beta decay
Chapter 44: gamma decay
 Fall 2023, Mechanics A
Lecture Notes (Chinese):
Chapter 1: Introduction ,
Chapter 2: Kinematics (with a crash course on calculus),
Chapter 3: Dynamics,
Chapter 4: Conservation laws
Chapter 5: Rigid body
Chapter 6: Elasticity
Chapter 7: Fluidity
Chapter 8: Oscillation and wave
Chapter 9: Relativity
Overview
Quizzes  Spring 2023, Frontiers in High Energy Nuclear Physics
 Fall 2022, Mechanics A(L)
 Fall 2012 & Spring 2013, Quantum Field Theory I&II, as lecturer (substitute)
TAs
 Fall 2021, Mechanics A
 Fall 2020, Group Theory
 Spring 2016, Introduction to Classical Physics I (Rec & Lab)
 Fall 2012, Introduction to Classical Physics I (Rec)
 Fall 2011, General Physics (Rec)
 Fall 2011, Introduction to Modern Physics I
 Spring 2011, Introduction to Classical Physics I (Lab)
 Fall 2010, General Physics (Lab)
 Fall 2010, Physics for the Nonscientist
Advising & Mentorship
Theses
 Yihan Duan, Nonperturbative lightcone Hamiltonian approach to parton distributions, undergraduate thesis, 2023 Spring, University of Science and Technology of China (Outstanding Thesis)
 Zhiguo Wang, Radiative decay of charmonium vector meson, undergraduate thesis, 2022 Spring, Lanzhou University
 Xianghui Cao, Relativistic bound states of scalar field theory on the light cone, undergraduate thesis, 2022 Spring, University of Science and Technology of China (Outstanding Thesis)
 Jialin Chen, 基函数光前量子化方法研究奇异介子, undergraduate thesis, 2021 Spring, Lanzhou University
 Wenyang Qian, Relativistic bound states within Basis LightFront Quantization, Ph.D. thesis, 2020, Iowa State University (Present affiliation: Postdoc at Iowa State University)
 Shuo Tang, Relativistic bound states on the light front, Ph.D. thesis, 2020, Iowa State University (Present affiliation: )
 Anji Yu, Baryons in a light front approach, graduate thesis, 2019, Iowa State University (Present affiliation: Software Engineer at Google Inc.)
 Meijian Li, Nonperturbative applications of quantum chromodynamics, Ph.D. thesis, 2019, Iowa State University (Present affiliation: Postdoc at University of Santiago de Compostela, Spain)
Topical discussions
 2023 Spring: Hepph daily. Wednesday, 4:00pm5:30pm.
 2022 Fall: Hepph Journal Club. Friday, 9:45am11:15am.
 2021 Fall: Lightfront QCD as quantum manybody theory. Friday, 4:00pm5:30pm. Discussion slides Part I Discussion slides Part II
Research
My recent research focuses on highenergy theory, in particular, the nonperturbative QCD, hadron structure and computational physics. You can check out my published work, recent talks and developements.
Here are some information for beginners.
Physical background
The quantum chromodynamics (QCD) describes the interactions between quarks and gluons. It is strong coupling at lowenegy scale, which leads to remarkable nonperturbative physics, e.g. confinement and chiral symmetry breaking. \[ \mathscr L_{\text{QCD}} = \overline\psi \big(i\gamma^\mu D_\mum\big)\psi  \frac{1}{4} F_{\mu\nu c}F^{\mu\nu c} \] The nonperturbative calculation of QCD is one of the most formidable challenges in physics. It is also the key to answer some of the fundamental questions in Nuclear Physics, such as how the quarks and gluons are binding together, and how the nuclear forces are formed to bind the nucleons. The nonperturbative properties of hadrons is also the focii of some present and forthcoming highenergy experiments, such as the 12 GeV upgrade of CEBAF at Jefferson Lab, the electronion collider (eRHIC) at Brookheaven National Lab, both in United States, the LHCb & ALICE experiments at CERN in Europe, the electron ion collider of China (EicC) at HIAF in Huizhou, the BESIII experiment at BEPC in Beijing, as well as the Belle II experiment at KEK in Japan.The Hamiltonian formalism is one of the fundamental theoretical frameworks of quantum theory and is widely used in physics. This formulation is nonperturbative and provides access to information at the amplitude level as well as the realtime evolution information, through the Schrödinger equation. The Hamiltonian formalism has been a standard tool in addressing strong coupling quantum manybody systems, such as the nuclei, atoms as well as the molecules. \[ i\frac{\partial}{\partial x^+}\psi(x^+)\rangle = P_+\psi(x^+)\rangle \] The lightfront dynamics, proposed by Paul Dirac, exploits dynamical evolution in the lightfront time \(x^+ = t + z/c\). It brings several dramatic simplification to the relativistic dynamics. Thus the lightfront Hamiltonian formalism is a natural framework for describing hadrons as relativistic bound states. It is nonperturbative and provides direct access to the hadronic observables in Richard Feynman's parton picture, one of the modern pillars in highenergy scattering experiments.
Recent advances in computational sciences (including quantum computing) provide opportunities to compute the nonperturbative solutions of QCD from first principles. Of course, the unique challenges posed by QCD require significant efforts in both the computational front and the physical front, separately and joinly, which are what I try to address in my research.
Basis lightfront quantization
Basis lightfront quantization (BLFQ) is a numerical framework to solve lightfront QCD as quantum manybody problems. It is inspired by the recent development in ab initio nuclear structure calculations. BLFQ is designed to preserve all kinematically symmetries of the Hamiltonian and exploits the sparse matrix technologies to accelerate the quantum manybody calculations.\[ H_\text{eff} = \sum_i \frac{\vec p_{i\perp}^2+m_i^2}{x_i} + U_i + \sum_{i,j} V_{ij}^{(2)} + \cdots + V^{(a)} + H_\text{cm} \] The starting point of BLFQ is an effective Hamiltonian defined in a designated model space. To obtain the effective Hamiltonian, one can start from the canonical QCD Hamiltonian at highenergy scales and obtain the boundstate effective Hamiltonian from the Hamiltonian renormalization group method, as is demonstrated in quantum electrodynamics (QED).
Alternatively, one can employ phenomenological effective interactions at lowenergy scale. We proposed a model based on confining interactions from lightfront holography and a onegluon exchange interaction. We use the model to investigate the meson spectroscopy. The obtained lightfront wave functions can be used to access hadronic observables and parton distributions.
Fock sector dependent renormalization
Nonperturbative renormalization is one of the fundamental challenges in quantum field theory (QFT) at strong coupling. The challenge is amplified in the Hamiltonian formulation of QFT, as explicit covariance is lost there. Remarkably, cluster decomposition still holds in lightfront dynamics, even though all diagrams are strictly lightfront time ordered. This fact is exploited in the Fock sector dependent renormalization (FSDR) to enable nonperturbative renormalization in lightfront field theories with systematic Fock sector truncations. FSDR has been successfully applied to (3+1)d QFTs, including scalar Yukawa theory, Yukawa theory and QED, with exact cancellations of ultraviolet divergences. The scalar Yukawa theory in particular is computed up to a Fock sector of 3 dressing particles and a good Fock sector convergence is achieved for form factors.Hadron spectrum and structures
We developed a relativistic model for hadrons based on lightfront holography and lightfront QCD. With a few phenomenological parameters, the model is able to produce hadron spectrum and observables comparable to the experimental measurements. With the obtained lightfront wave functions, it provides the direct access to parton distributions that describe the 3D structure of the hadrons. The model is successfully applied to quarkonium, heavylight systems, light mesons and nucleons with mixed success. It is the one of few models that provide a unified description of hadron spectra and structures.Chiral symmetry breaking and the pion
Pion is the lightest hadron. It consists of a quark and an antiquark. However, its mass \(M_\pi\) = 140 MeV is much lighter than the mass of the constituent quarks \(m_q \approx M_p/3\) = 320 MeV. It is believed to be an elementary NambuGoldstone boson of the spontaneously broken chiral symmetry. One of the curious questions is what is the structure of the pion to accommodate both the physics of chiral symmetry breaking and confinement. We derived an exact relation (called a sum rule) for the pion wave function based on the axialvector current conservation and the general covariant structure of the light front wave functions. This sum rule suggests that confinement and chiral symmetry breaking dictate the longdistance and shortdistance parts of the wave function, respectively. As such, the effective quarkantiquark potential must be in the shape of a sombrero (Mexican hat). Taking advantage of the lightfront holography, we further show that the chiral sum rule is consistent with the chiral symmetry breaking in AdS/QCD through the Higgs mechanism. Finally, these findings lead to a striking 3D picture of the pion: it is a uniform disk in the transverse direction and infinitely long in the longitudinal direction.Other interests
 QCD at finite temperature
 Quantum manybody theory & quantum computing
 Lowenergy nuclear physics
 Advanced algorithms in computational physics
 Foundations of quantum mechanics
Publications
Profile:
List of publications
 Yihan Duan, Siqi Xu, Shan Cheng, Xingbo Zhao, Yang Li, James P. Vary, Flavor asymmetry from the nonperturbative nucleon sea, [arXiv: 2404.07755 [hepph]]
 Siqi Xu, Xianghui Cao, Tianyang Hu, Yang Li, Xingbo Zhao, James P. Vary, Stress out of charmonia, [arXiv: 2404.06259 [hepph]]
 Yang Li, James Vary, Stress inside the pion in holographic lightfront QCD, Phys. Rev. D 109, L051501 (2024); [arXiv:2312.02543 [hepth]]
 Zhiguo Wang, Meijian Li, Yang Li, James P. Vary, Shedding light on charmonium, Phys. Rev. D 109, L031902 (2024); [arXiv:2312.02604 [hepph]]
 Siqi Xu, Chandan Mondal, Xingbo Zhao, Yang Li and James P. Vary, Quark and gluon spin and orbital angular momentum in the proton, Phys. Rev. D 108, 094002 (2023)
 Xianghui Cao, Yang Li, James Vary, Forces inside a stronglycoupled scalar nucleon, Phys. Rev. D 108, 056026 (2023); [arXiv: 2308.06812 [hepph]]
 James Vary, Yang Li, Chandan Mondal, Xingbo Zhao, Lightfront quantization, in 50 Years of Quantum Chromodynamics, Eds. Franz Gross and Eberhard Klempt, Eur. J. Phys. C 83, 1125 (2023); [arXiv: 2209.08584 [hepph]]
 Siqi Xu, Chandan Mondal, Xingbo Zhao, Yang Li, James P. Vary, Nucleon spin decomposition with one dynamical gluon, [arXiv: 2209.08584 [hepph]]
 Yang Li, Wenbo Dong, Yiliang Yin, Qun Wang, James P. Vary, Minkowski's lost legacy and hadron electromagnetism, Phys. Lett. B 838 (2023) 137676; [arXiv: 2206.12903 [hepph]]
 Yang Li, P. Maris, and J.P. Vary, Chiral sum rule on the light front, Phys. Lett. B 836 (2023) 137598; [arXiv: 2203.14447 [hepth]]
 Yang Li, and J.P. Vary, Longitudinal dynamics for mesons on the light cone, Phys. Rev. D 105, 114006 (2022); [arXiv: 2202.05581 [hepph]]
 Yang Li, Meijian Li, and J.P. Vary, Twophoton transitions of charmonia on the light front, Phys. Rev. D 105 (2022) 7, L071901; [arXiv: 2111.14178 [hepph]]
 Meijian Li, Yang Li, Guangyao Chen, T. Lappi, and J.P. Vary, Lightfront wavefunctions of mesons by design, Eur. Phys. J. C 82 (2022) 11; [arXiv: 2111.07087 [hepph]]
 Siqi Xu et al. (BLFQ Collaboration), Nucleon structure from basis lightfront quantization, Phys. Rev. D 104 (2021) 9, 094036; [arXiv: 2108.03909 [hepph]]
 Yang Li, and J.P. Vary, Lightfront holography with chiral symmetry breaking, Phys. Lett. B 825 (2022) 136860; [arXiv:2103.09993 [hepph]]
 W. Qian, S. Jia, Yang Li, and J.P. Vary, Light mesons within the basis lightfront quantization framework, Phys. Rev. C 102, no.5, 055207 (2020); [arXiv:2005.13806 [nuclth]].
 M. Li, X. Zhao, P. Maris, G. Chen, Yang Li, K. Tuchin and J.P. Vary, Ultrarelativistic quarknucleus scattering in a lightfront Hamiltonian approach, Phys. Rev. D 101, no.7, 076016 (2020); [arXiv:2002.09757 [nuclth]].
 S. Tang, Yang Li, P. Maris and J. P. Vary, Heavylight mesons on the light front, Eur. Phys. J. C 80, no.6, 522 (2020); [arXiv:1912.02088 [nuclth]].
 J. Lan, C. Mondal, M. Li, Yang Li, S. Tang, X. Zhao and J.P. Vary, Parton Distribution Functions of Heavy Mesons on the Light Front, Phys. Rev. D 102, no.1, 014020 (2020); [arXiv:1911.11676 [nuclth]].
 W. Du, Yang Li, X. Zhao, G.A. Miller and J.P. Vary, Basis LightFront Quantization for a Chiral NucleonPion Lagrangian, Phys. Rev. C 101, no.3, 035202 (2020); [arXiv:1911.10762 [nuclth]].
 C. Mondal, S. Xu, J. Lan, X. Zhao, Yang Li, D. Chakrabarti and J.P. Vary, Proton structure from a lightfront Hamiltonian, Phys. Rev. D 102, no.1, 016008 (2020); [arXiv:1911.10913 [hepph]].
 M. Li, Yang Li, P.Maris and J.P. Vary, Frame dependence of transition form factors in lightfront dynamics, Phys. Rev. D 100, no.3, 036006 (2019); [arXiv:1906.07306 [nuclth]].
 G. Chen, Yang Li, K. Tuchin, and J.P. Vary, Heavy quarkonia production at energies available at the CERN Large Hadron Collider and future electronion colliding facilities using basis lightfront quantization wave functions, Phys. Rev. C 100, no.2, 025208 (2019); [arXiv:1811.01782 [nuclth]].
 L. Adhikari, Yang Li, M.j. Li, P. Maris, J.P. Vary, Form factors and generalized parton distributions of heavy quarkonia in basis light front quantization, Phys. Rev. C 99, no.3, 035208 (2019); [arXiv:1809.06475 [hepph]].
 S. Tang, Yang Li, P. Maris, J.P. Vary, Bc mesons and their properties on the light front, Phys. Rev. D 98, no.11, 114038 (2018); [arXiv:1810.05971 [nuclth]]
 M.j. Li, Yang Li, P. Maris, and J.P. Vary, Radiative transitions between 0+ and 1 heavy quarkonia on the light front, Phys. Rev. D 98, 034024 (2018); [arXiv:1803.11519 [hepph]]
 Weijie Du, Peng Yin, Yang Li, Guangyao Chen, Wei Zuo, Xingbo Zhao, James P. Vary, Coulomb Excitation of Deuteron in Peripheral Collisions with a Heavy Ion, Phys. Rev. C 97, 064620 (2018); [arXiv:1804.01156 [nuclth]]
 Yang Li, P. Maris and J.P. Vary, Frame dependence of form factors in lightfront dynamics, Phys. Rev. D 97, 054034 (2018); [arXiv:1712.03467 [hepph]]
 Yang Li, Kirill Tuchin, Electrodynamics of dual superconducting chiral medium, Phys. Lett. B 776, 270 (2018); [arXiv:1708.08536 [hepph]]
 S. Leitão, Yang Li, P. Maris, M.T. Peña, A. Stadler, J.P. Vary, E.P. Biernat, Comparison of two Minkowskispace approaches to heavy quarkonia, Eur. J. Phys. C, 66, 696 (2017); [arXiv:1705.06178 [hepph]]
 Yang Li, P. Maris, J.P. Vary, Quarkonium as relativistic bound state on the light front, Phys. Rev. D 96, 016022 (2017); [arXiv:1704.06968 [hepph]]
 G. Chen, X. Zhao, Yang Li, K. Tuchin and J.P. Vary, Particle distribution in intense fields in a lightfront Hamiltonian approach, Phys. Rev. D 95, 096012 (2017); [arXiv:1702.06932 [nuclth]]
 G. Chen, Yang Li, P. Maris, K. Tuchin and J.P. Vary, Diffractive charmonium spectrum in high energy collisions in the basis lightfront quantization approach, Phys. Lett. B 769, 477 (2017); [arXiv:1610.04945 [nuclth]]
 V.A. Karmanov, Yang Li, A.V. Smirnov and J.P. Vary, Nonperturbative solution of scalar Yukawa model in two and threebody Fock space truncations, Phys. Rev. D 94, 096008 (2016); [arXiv:1610.03559 [hepth]]
 Yang Li, P. Maris, X. Zhao and J.P. Vary, Heavy Quarkonium in a Holographic Basis, Phys. Lett. B 758, 118 (2016); [arXiv:1509.07212 [hepph]]; See Data.
 L. Adhikari, Yang Li, X. Zhao, P. Maris, J.P. Vary and A.A. ElHady, Form Factors and Generalized Parton Distributions in Basis LightFront Quantization, Phys. Rev. C 93, 055202 (2016); [arXiv:1602.06027 [nuclth]]
 Yang Li, V.A. Karmanov, P. Maris and J.P. Vary, Ab Initio Approach to the NonPerturbative Scalar Yukawa Model, Phys. Lett. B 748, 278 (2015); [arXiv:1504.05233 [nuclth]]
 P. Wiecki, Yang Li, X. Zhao, P. Maris and J.P. Vary, Basis lightfront quantization approach to positronium, Phys. Rev. D 91, 105009 (2015); [arXiv:1404.6234 [nuclth]]
 S. Wu and Yang Li, Weak Measurement beyond the AharonovAlbertVaidman formalism, Phys. Rev. A 83, 052106 (2011); [arXiv:1010.1155 [quantph]]
Reviews and Chapters
 James P. Vary, Yang Li, Chandan Mondal and Xingbo Zhao, Lightfront quantization, in 50 Years of Quantum Chromodynamics, F. Gross and E. Klempt Eds., Eur. Phys. J. C 83, 1125 (2023)
Talks
Click titles to download slides.
Conferences
 Quantum stress within hadrons. ILCAC Seminars, May 15, 2024, Zoom. Invited Talk.
 Strong force inside hadrons. 杨米尔斯质量隙假设青年团队研讨会, December 2930, 2023, Institute of Modern Physics, Chinese Academy of Sciences, Huizhou.
 光锥哈密顿量方法研究强子结构. 第六届强子谱和强子结构会议, Aug 30, 2023, University of Chinese Academy of Sciences, Beijing.
 Big problems, Big computers and a Big man: Towards ab initio hadron physics with basis lightfront quantization. Nuclear Theory in the Supercomputing Era (NTSE 2023), June 5, 2023, Institute of Modern Physics, Lanzhou. Invited Talk.
 Confinement, chiral symmetry breaking and holography: from semiclassical approximation to ab initio lightfront QCD. Hamiltonian Field Theory for Hadron Physics and QCD, May 15  18, 2023, Universidad de Granada, Spain. Invited Talk.
 Hadron spectroscopy and structures from lightfront QCD. Impromptu INP Workshop on QCD and Hadron Structure, May 11  12, 2023, Nanjing University, Nanjing. Invited Talk.
 Hadron spectroscopy and structures from lightfront QCD. Rvalue and QCD, March 30  April 2, 2022, Sun Yatsen University Zhuhai Campus, Zhuhai. Invited Talk.
 Confinement, chiral symmetry breaking and holography: the 3D image of the pion . Hadron Physics Online Forum, September 30, 2022, Tecent Meeting. Invited Talk.
 Confinement, chiral symmetry breaking, holography and the 3D image of the pion . Light Cone 2022 Online: Physics of Hadrons on the Light Front, September 1924, 2022, ZOOM. Invited Talk.
 Twophoton transitions of charmonia on the light front . 13th International Workshop on e+e collisions from Phi to Psi, August 1519, 2022, Fudan University, Shanghai & Zoom.
 Confinement, chiral symmetry breaking, holography and the 3D image of the pion . ECT* Workshop on Gauge topology, flux tubes and holographic models, May 24, 2022, Villazzano, Italy & Zoom.
 Light front chiral sum rule and the implication to the pion structure . Perceiving the Emergence of Hadron Mass through AMBER@CERN, May 13, 2022, Zoom.
 Twophoton transitions of charmonia on the light front . DIS XXIX: International Workshop on DeepInelastic Scatteringand Related Subjects, May 4, 2022, Santiago de Compostela, Spain. (Delivered by Meijian Li)
 Lightfront holography with chiral symmetry breaking: From semiclassical first approximation to ab initio lightfront QCD. ILCAC Wednesday Seminars, February 16, 2022, Zoom. Invited Talk.
 Twophoton transitions of charmonia on the light front. Light Cone 2021, December 1, 2021, Jeju Island, S. Korea.
 Light front holography with chiral symmetry breaking: a quest for a semiclassical approximation to QCD. 轻味矢量介子理论与实验联合研讨会. July 1923, 2021, Xining, Qinghai. Invited Talk.
 Basis LightFront Quantization Approach to meson spectrum and structures. ILCAC Wednesday Seminars. March 3, 2021 (online). Invited Talk.
 Quarkonium as a relativistic bound state on the light cone. 2017 Fall Meeting of the American Physical Society, Dvision of Nuclear Physics (DNP 2017), Oct. 2528, 2017, Pittsburgh, Pennsylvannia, U.S. Invited Talk.
 Basis LightFront Quantization Approach to Heavy Quarkonium. Baryons 2016, May 1620, 2016, Tallahassee, Florida, U.S.
 Heavy Quarkonia on the Light Front. APS April Meeting 2016, April 1619, 2016, Salt Lake City, Utah, U.S.
 Heavy quarkonium in a lightfront holographic basis. Light Cone 2016 (LC2016), Sep. 58, 2016, Lisbon, Portugal. Invited Talk.
 Quarkonium in a Holographic Basis. 2015 Fall Meeting of the APS Division of Nuclear Physics (DNP2015), Oct. 2831, 2015, Santa Fe, New Mexico, U.S.
 Quarkonium in a holographic basis. XXVIII Midwest Theory GetTogether (MWTGT), Sep. 1112, 2015, Argonne National Lab, Illinois, U.S.
 Scalar Yukawa Model on the Light Front: ab initio approach to quantum field theory. APS April meeting 2015, Apr. 1114, Baltimore, Maryland, U.S.
 NonPerturbative Calculation of Scalar Yukawa Theory in LightFront Dynamics. Light Cone 2014 (LC2014), May 2630, 2014, Raleigh, North Carolina, U.S. Invited Talk.
 Convergence of the Fock Sector Expansion in LightFront Hamiltonian Field Theory. XXVII Midwest Theory GetTogether (MWTGT), Sep. 56, 2014, Argonne National Lab, Illinois, U.S.
 Introduction to basis lightfront quantization approach to QCD bound state problem. International Conference on Nuclear Theory in the Supercomputing Era (NTSE 2013), May 1317, 2013, Ames, Iowa, U.S. Invited Talk.
 A Novel Basis for LightFront Quantum Field Theory. XXV Midwest Theory GetTogether (MWTGT), Sep. 78, 2012, Argonne National Lab, Illinois, U.S.
 Calculation of BLFQ Hamiltonian Matrix Elements. XXIV Midwest Theory GetTogether (MWTGT), Sep. 2324, 2011, Argonne National Lab, Illinois, U.S.
Seminars
 Towards ab initio hadronic physics with basis lightfront quantization. Seminar in North China Electric Power University, March 12, 2024, Beijing & Tencent Meeting.
 Pion gravitational form factor \(D_\pi(Q^2)\) from holographic LFQCD. IGFAE seminar, February 21, 2024, Zoom & IGFAE, Universidade de Santiago de Compostela, Spain.
 Pion gravitational form factor \(D_\pi(Q^2)\) from holographic lightfront QCD. XXXIV Holographic QCD seminar, January 6, 2024, Tencent Meeting & Chinese Academy of Sciences, Beijing.
 Quantum stress within hadrons. 201st Highenergy Nuclear Physics in China seminar, January 4, 2024, Zoom & Central China Normal University, Wuhan.
 Hadron spectroscopy and structures from lightfront QCD: from semiclassical approximation to ab initio calculation . Peng Huanwu Center for Fundamental Theory Seminar, May 25, 2023, University of Science and Technology of China. Invited Talk.
 光锥上的量子色动力学：从一级近似到第一性原理的计算 . “科学之光”学术论坛, May 9, 2023, Anhui University. Invited Talk.
 Hadron structure in 3D. Nuclear Theory Seminar, Sept. 1, 2022, Iowa State University. Invited Talk.
 The Janus meson on the light front: The 3D image of the pion. Nuclear Theory Seminar, April 30, 2022, University of Chinese Academy of Sciences, Beijing. Invited Talk.
 Lightfront holography with longitudinal dynamics: Semiclassical first approximation for ab initio calculations. NTC Seminar, February 24, 2022, Stony Brook University, U.S. Invited Talk.
 Light front holography with chiral symmetry breaking: from semiclassical approximation to ab initio QCD. Particle and Nuclear Physics Seminar, June 4, 2021, University of Science and Technology of China, Hefei.
 物质基本结构与超级计算机. Guest Lecture on the Undergraduate Research Program, Nov. 20, 2020, University of Chinese Academy of Sciences, Beijing.
 Electrodynamics of dual superconducting medium. Institute of Modern Physics, Chinese Academy of Sciences, January 4, 2018, Lanzhou, China.
 Quarkonium on the light front. Theory Center Cake Seminar, November 8, 2017, Jefferson Lab, Virginia, U.S.
 NonPerturbative Quantum Field Theories on the Light Front. Guest Lectures given at PHYS 625: Physics of Strong Interactions, Iowa State University, August 22 & 24, 2017, Ames, Iowa, U.S.
Posters
Developments
Notes

Spinors on the light front
A note that provides a consistent set of definitions and useful identities for lightfront field theory.

Mathematica visualization for scientific publication
A set of slides on scientific visualizations using Mathematica.
Softwares
 Lightfront spinors
A Mathematica package that defines the gamma matrices and spinors used in lightfront dynamics. See also my note, Spinors on the light front for details.

TalmiMoshinsky in 2D
Fortran and Mathematica codes to compute the 2D TalmiMoshinsky transformation coefficients.

Color singlet
A Mathematica package that computes the number of color singlets given the numbers of quarks, antiquarks and gluons.
Table of number of color singlets
Data

Mendeley Data: Quarkonium lightfront wave functions
The set of data contains charmonium and bottomonium lightfront wave functions obtained from the Basis LightFront Quantization (BLFQ) approach with a running coupling as described in Yang Li, P. Maris, J.P. Vary, Quarkonium as relativistic bound state on the light front, Phys. Rev. D 96, 016022 (2017) ; [arXiv:1704.06968 [hepph]]. A visualization of the wave functions can be found in: Ancillary files for arXiv:1704.06968
Vita
Education
 2010  2015: Iowa State University, Ph.D.
 2006  2010: University of Science and Technology of China, B.Sc.
Experiences
 2021  present: University of Science and Technology of China, Professor
 2020  2021: University of Chinese Academy of Sciences, Lecturer
 2018  2020: Iowa State University, Visiting Scientist
 2017  2018: College of William & Mary, Postdoctoral Research Associate
 2016  2017: Iowa State University, Postdoctoral Research Associate
Services
 Reviewer for Physical Review D, Journal of Physics G, FewBody Systems
Awards
 2016, G.W. Fox Memorial Award, Department of Physics and Astronomy, Iowa State University
 2014, Gary McCartor Award, ILCAC
Invited Talks
See Talks
Useful Links
HEP Seminars
 ILCAC Wednesday Seminars
 High Energy Nuclear Theory Seminar, University of Science & Technology of China
 CFNS Seminar, Stony Brook University
Resources
 Light Front Collaboration
 National Energy Research Scientific Computing Center (NERSC)
 Workstation: net_id@lf2.physics.iastate.edu
 A chain fountain simulator
Libraries
 Handbook of Mathematical Functions, Eds. M. Abramowitz and I. Stegun
 NIST Digital Library of Mathematical Functions
Institutes
 The HighEnergy Nuclear Theory Group » Particle and Nuclear Physics » Department of Modern Physics » School of Physics » University of Science and Technology of China
 Interdisciplinary Center for Theoretical Study (ICTS)
 State Key Laboratory of Particle Detection and Electronics
 Iowa State University
 College of William & Mary
 Thomas Jefferson Lab Theory Center
 The International Light Cone Advisory Committee (ILCAC)