摘要
We report on the theoretical and experimental investigations of the transition of a typical quantum system with mixed regular-integrable classical dynamics to one with violated time-reversal(T)invariance.The measurements are performed with a flat superconducting microwave resonator with circular shape in which chaoticity is induced by using either long antennas or inserting two circular disks into the cavity,and by magnetizing a ferrite disk placed at its center,which leads to violation of T invariance.We propose an extension of the Rosenzweig-Porter(RP)model,which interpolates between mixed regular-chaotic instead of integrable dynamics and fully chaotic dynamics with violated T-invariance,and derive a Wigner-surmise like analytical expression for the corresponding nearest-neighbor spacing distribution.We propose a procedure involving this result and those for the RP model to determine the size of T-invariance violation and chaoticity and validate it employing the experimental eigenfrequency spectra.
作者
Xiaodong Zhang
Jiongning Che
Barbara Dietz
张晓东;车炯宁;Barbara Dietz(Lanzhou Center for Theoretical Physics,Key Laboratory of Theoretical Physics of Gansu Province,and Key Laboratory of Quantum Theory and Applications of the Ministry of Education,Lanzhou University,Lanzhou 730000,China;Center for Theoretical Physics of Complex Systems,Institute for Basic Science(IBS),Daejeon 34126,Korea;Yangtze Delta Region Institute,University of Electronic Science and Technology of China,Huzhou 313001,China;Basic Science Program,Korea University of Science and Technology(UST),Daejeon 34113,Korea)
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.11775100,12247101,and 11961131009)
the financial support from the China Scholarship Council(Grant No.CSC202306180087)
the financial support from the Institute for Basic Science in Korea(Grant No.IBS-R024-D1)。
作者简介
Corresponding author:Barbara Dietz.E-mail:bdietzp@gmail.com。
