About Me
Here is Dr. Zheng Xiong (熊 峥). I am a collaborator in the LHAASO (Large High Altitude Air Shower Observatory) Collaboration and DAMPE (Dark Matter Particle Explorer) Collaboration.
I cooperated with my Ph.D supervisor, Prof. Huihai He, to revolve around the Lorentz violation constraint using the LHAASO-KM2A early-stage observation and cosmic-ray electron studies. Now, I am working with my Post-Doc superivsor, Prof. Ivan De Mitri.
Here is my Resume in English /in Mandarin Chinese.
Academic Background
`[Highlight]`- Dec 2024 - now : Gran Sasso Science Institute (Post-doc)
- Aug 2019 - Nov 2024 : Institute of High Energy Physics (Part-time Research Assistant)
- Sep 2019 - Jun 2024 : Institute of High Energy Physics (Ph.D. Student)
- Sep 2015 - Jun 2019: Wuhan University of Technology (BEng)
Research Interests
- Cosmic-Ray Electrons (2022-2024)
Measurement of cosmic-ray electron spectrum above 20 TeV with ground-based arrays is still challenging because of the difficulty of rejection of hadronic extensive air shower background. In the feasibility research stage (2022), I found that the current hadron rejection power of the LHAASO-KM2A is insufficient to measure cosmic-ray electrons. I developed a new method to use WCDA to measure the muonic content in each shower. With the help of WCDA, the rejection power of LHAASO-KM2A has the potential to measure the cosmic-ray electron spectrum over 20 TeV. In the current research stage (2023), I am increasing the simulated statistics to get optimized discrimination cuts for KM2A. These results have already been reported at a recent conference, ICRC 2023. And I expect to see the early result of the cosmic-ray electron spectrum measured by LHAASO in 2024.
- Lorentz Violation (2021)
The tiny modification of dispersion relation induced by Lorentz violation (LV) is an essential issue in quantum gravity (QG) theories, which can be magnified into significant effects when dealing with astrophysical observations at high energy and long propagation distance. LV would lead to photon decay at high energies, therefore, observations of high-energy photons could constrain LV or even QG theories. The Large High Altitude Air Shower Observatory (LHAASO) reported the detection of PeV photon and Sub-PeV gamma sources. I have considered two scenarios of photon decay and photon splitting, which will set the most stringment limit for violation enegry scale than before.
- First Principle Calculation on complex perovskite
Barium-based complex perovskite ($\rm{Ba(B^{\prime}B^{\prime\prime})O_{3}}$) ceramic is a kind of important material with outstanding properties such as high permittivity, structural tolerance, and chemical stability, which indicated their broad range of application in the optical field, including optical windows, lasers, scintillators, etc. The previous experiments and theoretical calculations in our research group have shown that the substitution of B-site ions causes the structural distortion of $[\rm{BO_{6}}]$ octahedrons and the perturbation of the electronic structure, thus affecting the optical properties of $\rm{Ba(B^{\prime}B^{\prime\prime})O_{3}}$. Based on these results, I focused on the influence mechanism of the modification on the optical properties of $\rm{Ba(B^{\prime}B^{\prime\prime})O_{3}}$ through the substitution of B-site ions, which aimed to make a contribution to the appliance of spectral modulation.