Chin. Phys. Lett.  2020, Vol. 37 Issue (10): 100301    DOI: 10.1088/0256-307X/37/10/100301
GENERAL |
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*
1Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
2CAS Key Laboratory of Microscale Magnetic Resonance, University of Science and Technology of China, Hefei 230026, China
3Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
4National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
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Peiran Yin, Xiaohui Luo, Liang Zhang et al  2020 Chin. Phys. Lett. 37 100301
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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.
Received: 04 June 2020      Published: 29 September 2020
PACS:  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)  
Fund: Supported by the Fundamental Research Funds for the Central Universities (Grant No. WK2030000032), the National Key R&D Program of China (Grant No. 2018YFA0306600), the CAS (Grant Nos. GJJSTD20170001 and QYZDY-SSW-SLH004), and Anhui Initiative in Quantum Information Technologies (Grant No. AHY050000).
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http://cpl.iphy.ac.cn/10.1088/0256-307X/37/10/100301       OR      http://cpl.iphy.ac.cn/Y2020/V37/I10/100301
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Peiran Yin
Xiaohui Luo
Liang Zhang
Shaochun Lin
Tian Tian
Rui Li
Zizhe Wang
Changkui Duan
Pu Huang
and Jiangfeng Du
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