Experimental Investigation of Non-Hermitian Physics with Sigle-Spin System

by Prof. Xing Rong (University of Science and Technology of China)

Wednesday 10 Apr 2024, 15:30 → 16:30 Asia/Shanghai

TDLI Meeting Room N600 (East Wing of Floor 6, North Building)

Abstract
Non-Hermitian Physics offers a realm of complicated and exotic features surpassing its Hermitian counterpart. At the core of this fascinating field lie Exceptional Points (EPs)—singularities that emerge in non-Hermitian systems, where k (k ≥ 2) eigenvalues and eigenstates converge. Notably, high-order EPs exhibit more topological characteristics and superior sensing performance compared to second-order EPs. Theoretical predictions hint at even richer non-Hermitian topological phases associated with high-order EP geometries, including lines or rings entirely formed by high-order EPs. Consequently, it becomes crucial to investigate high-order EPs and their related structures. I will report our recent experiment which is to achieve the quantum control of single-spin system with non-Hermitian Hamiltonians [1,2] and thus enable further observation of the high-order EP line in quantum system [3].
[1] Yang Wu et al., Observation of parity-time symmetry breaking in a single-spin system, Science 364, 878 (2019)
[2] Wenquan Liu et al., Dynamically Encircling an Exceptional Point in a Real Quantum System, Physical Review Letters 126, 170506 (2021).
[3] Yang Wu et al., Third-order exceptional line in a nitrogen-vacancy spin system, Nature Nanotechnology 19, 160-165 (2024)
Biography
Dr. Rong earned his PhD in Physics from the University of Science and Technology of China (USTC) in 2011. Following that, he served as a postdoctoral researcher in the School of Physical Sciences at USTC. Currently, he holds the position of Professor within the same school. His research focus centers on advancing the technology of pulsed Electron Spin Resonance and exploring its applications in the field of quantum information science.
Division
Condensed Matter