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High-energy photon radiation and pair production are two of the most important QED processes. Significant advance in the multi-PW laser technology opens the door to the study of laser-matter interactions in an unexplored strong-field regime, where radiation reaction effects play a crucial role in electron dynamics and a large amount of electron energy can be converted into high-energy photon emission. In such extreme fields, the multiphoton Breit-Wheeler process can be triggered to generate dense electronpositron pairs with high efficiency. In this talk, we will present our recent work on the efficient generation of giant collimated gamma-rays and dense GeV positrons in plasmas. Particle-in-cell simulations show that overdense GeV positrons can be created using 10-petawatt scale lasers in near-critical density plasmas, and extremely bright gamma-ray flashes can be generated by use of a novel concept of beam-solid interactions. This may open up new opportunities for many cutting-edge applications and fundamental research.
Dr. Xinglong Zhu is a postdoctoral fellow at Shanghai Jiao Tong University. Currently, his research interests mainly focus on the physics and applications of high-intensity laser plasma interactions. So far, he has published 15 first-author papers in peer-reviewed journals, including 1 in Nature Communications, 1 in Science Advances, 1 in Light: Science & Applications, and 1 in Optica, with about 600 citations and H-index 12 in google scholar. Due to his outstanding performance, he was awarded the John Dawson Thesis Prize, OCPA Outstanding Dissertation Award, CAI Shidong Award in Plasma Physics, U30 Scientist and Student Award, etc. He received the support from National Postdoctoral Program for Innovative Talents of China, Shanghai Super Postdoctoral Fellowships, and National Natural Science Foundation of China.