中国物理B ›› 2023, Vol. 32 ›› Issue (3): 30302-030302.doi: 10.1088/1674-1056/aca39a

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Floquet scattering through a parity-time symmetric oscillating potential

Xuzhen Cao(曹序桢)1,2, Zhaoxin Liang(梁兆新)3,†, and Ying Hu(胡颖)1,2,‡   

  1. 1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China;
    2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China;
    3 Department of Physics, Zhejiang Normal University, Jinhua 321004, China
  • 收稿日期:2022-09-21 修回日期:2022-11-09 接受日期:2022-11-17 出版日期:2023-02-14 发布日期:2023-02-21
  • 通讯作者: Zhaoxin Liang, Ying Hu E-mail:zhxliang@zjnu.edu.cn;huying@sxu.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0304203), the National Natural Science Foundation of China (Grant No. 11874038), the Zhejiang Provincial Natural Science Foundation (Grant No. LZ21A040001), the National Natural Science Foundation of China (Grant No. 12074344), and the Key Projects of the Natural Science Foundation of China (Grant No. 11835011).

Floquet scattering through a parity-time symmetric oscillating potential

Xuzhen Cao(曹序桢)1,2, Zhaoxin Liang(梁兆新)3,†, and Ying Hu(胡颖)1,2,‡   

  1. 1 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China;
    2 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China;
    3 Department of Physics, Zhejiang Normal University, Jinhua 321004, China
  • Received:2022-09-21 Revised:2022-11-09 Accepted:2022-11-17 Online:2023-02-14 Published:2023-02-21
  • Contact: Zhaoxin Liang, Ying Hu E-mail:zhxliang@zjnu.edu.cn;huying@sxu.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0304203), the National Natural Science Foundation of China (Grant No. 11874038), the Zhejiang Provincial Natural Science Foundation (Grant No. LZ21A040001), the National Natural Science Foundation of China (Grant No. 12074344), and the Key Projects of the Natural Science Foundation of China (Grant No. 11835011).

摘要: We investigate the scattering of a particle from a trapping potential that is subjected to weak, parity-time symmetric periodic drivings. Using the Floquet theory, we derive the scattering matrix and calculate the transmittance of the incident particle. When the driving is purely coherent, our calculation recovers the known result and the transmission spectrum shows the familiar, bound-state-induced Fano resonances. When the driving is purely incoherent, we find the Fano resonances still occur, but the lineshape of each resonance is reversed compared to the coherent-driving counterpart. Intriguingly, the transmission resonances disappear when both the coherent and incoherent driving fields are present with equal amplitudes. This phenomena can be seen as a manifestation of the non-reciprocal coupling of Floquet channels in the frequency domain. Notably, when the frequency up-conversion is absent, the transmission is such as if there is no driving at all, even when the driving strength increases.

关键词: open system, periodic driving, scattering

Abstract: We investigate the scattering of a particle from a trapping potential that is subjected to weak, parity-time symmetric periodic drivings. Using the Floquet theory, we derive the scattering matrix and calculate the transmittance of the incident particle. When the driving is purely coherent, our calculation recovers the known result and the transmission spectrum shows the familiar, bound-state-induced Fano resonances. When the driving is purely incoherent, we find the Fano resonances still occur, but the lineshape of each resonance is reversed compared to the coherent-driving counterpart. Intriguingly, the transmission resonances disappear when both the coherent and incoherent driving fields are present with equal amplitudes. This phenomena can be seen as a manifestation of the non-reciprocal coupling of Floquet channels in the frequency domain. Notably, when the frequency up-conversion is absent, the transmission is such as if there is no driving at all, even when the driving strength increases.

Key words: open system, periodic driving, scattering

中图分类号:  (Decoherence; open systems; quantum statistical methods)

  • 03.65.Yz
03.65.-w (Quantum mechanics) 03.65.Nk (Scattering theory)