Chiral State Conversion in a Levitated Micromechanical Oscillator with In Situ Control of Parameter LoopsSupported 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)
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 th...
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Published in | Chinese physics letters Vol. 37; no. 10 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Chinese Physical Society and IOP Publishing Ltd
01.10.2020
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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. |
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AbstractList | 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. |
Author | Wang, Zizhe Tian, Tian Zhang, Liang Duan, Changkui Yin, Peiran Du, Jiangfeng Li, Rui Lin, Shaochun Luo, Xiaohui Huang, Pu |
Author_xml | – sequence: 1 givenname: Peiran surname: Yin fullname: Yin, Peiran organization: Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , China – sequence: 2 givenname: Xiaohui surname: Luo fullname: Luo, Xiaohui organization: National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University , China – sequence: 3 givenname: Liang surname: Zhang fullname: Zhang, Liang organization: Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , China – sequence: 4 givenname: Shaochun surname: Lin fullname: Lin, Shaochun organization: Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , China – sequence: 5 givenname: Tian surname: Tian fullname: Tian, Tian organization: Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , China – sequence: 6 givenname: Rui surname: Li fullname: Li, Rui organization: Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , China – sequence: 7 givenname: Zizhe surname: Wang fullname: Wang, Zizhe organization: Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , China – sequence: 8 givenname: Changkui surname: Duan fullname: Duan, Changkui organization: Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , China – sequence: 9 givenname: Pu surname: Huang fullname: Huang, Pu email: hp@nju.edu.cn organization: National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University , China – sequence: 10 givenname: Jiangfeng surname: Du fullname: Du, Jiangfeng email: djf@ustc.edu.cn organization: Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , China |
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Title | Chiral State Conversion in a Levitated Micromechanical Oscillator with In Situ Control of Parameter LoopsSupported 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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