Powered by Indico
v3.2.3
Abstract：
Ultralight axion-like particles (ALPs) are well-motivated dark matter candidates introduced by theories beyond the standard model. However, the constraints on the existence of ALPs through existing laboratory experiments are hindered by their current sensitivities, which are usually weaker than astrophysical limits. In this talk, I will introduce our “Sapphire” project: Spin Amplifier for Particle PHysIcs REsearches. Concretely, we developed a quantum sensor with spin amplifier to search for ALPs. Using the spin-exchange collisions between overlapping noble-gas spins and alkali-atom spins, we have theoretically and experimentally demonstrated the noble-gas spin amplification in various quantum techniques including maser, Floquet maser, spin-based amplifier and Floquet spin amplifier. The noble-gas spin amplification can enhance the external oscillating magnetic field by a factor of more than 100 and realize ultrasensitive magnetometry, which is important for detection of weak electromagnetic fields and hypothetical particles. Based on the spin amplification, experiments have been conducted to search for axion-like dark matter and exotic spin-dependent forces and new constraints have been established. I will summarize the recent progress on noble-gas spin amplification, including the basic principles, methods, different types, its applications to searches for new physics, and prospects for further improvements.
Biography：
Xinhua Peng is a professor in the Department of Modern Physics at University of Science and Technology of China, China. She received her Ph.D. in atomic and molecular physics from Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, in July 2003. After that, she arrived at the University of Dortmund, Germany, as an Alexander von Humboldt Fellow. She joined in University of Science and Technology of China as a Professor in 2008. She was awarded National Science Fund for Distinguished Young Scholars. Her main research interests include quantum information processing using magnetic resonance technology, nuclear magnetic resonance spectroscopy, quantum sensing and fundamental physics. She authored more than 100 papers in reputed journals.