Chiral State Conversion in a Levitated Micromechanical Oscillator with ${\boldsymbol In~Situ}$ Control of Parameter Loops
Peiran Yin1,2,3 , Xiaohui Luo4 , Liang Zhang1,2,3 , Shaochun Lin1,2,3 , Tian Tian1,2,3 , Rui Li1,2,3 , Zizhe Wang1,2,3 , Changkui Duan1,2,3 , Pu Huang4* , and Jiangfeng Du1,2,3*
1 Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China2 CAS Key Laboratory of Microscale Magnetic Resonance, University of Science and Technology of China, Hefei 230026, China3 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China4 National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
Abstract ：Physical systems with gain and loss can be described by a non-Hermitian Hamiltonian, which is degenerated at the exceptional points (EPs). Many new and unexpected features have been explored in the non-Hermitian systems with a great deal of recent interest. One of the most fascinating features is that chiral state conversion appears when one EP is encircled dynamically. Here, we propose an easy-controllable levitated microparticle system that carries a pair of EPs and realize slow evolution of the Hamiltonian along loops in the parameter plane. Utilizing the controllable rotation angle, gain and loss coefficients, we can control the structure, size and location of the loops in situ . We demonstrate that, under the joint action of topological structure of energy surfaces and nonadiabatic transitions, the chiral behavior emerges both along a loop encircling an EP and even along a straight path away from the EP. This work broadens the range of parameter space for the chiral state conversion, and proposes a useful platform to explore the interesting properties of exceptional points physics.
收稿日期: 2020-06-04
出版日期: 2020-09-29
:
03.65.-w
(Quantum mechanics)
84.71.Ba
(Superconducting magnets; magnetic levitation devices)
45.80.+r
(Control of mechanical systems)
11.30.Er
(Charge conjugation, parity, time reversal, and other discrete symmetries)
引用本文:
. [J]. 中国物理快报, 2020, 37(10): 100301-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/37/10/100301
或
https://cpl.iphy.ac.cn/CN/Y2020/V37/I10/100301
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2020, Vol. 37 
