Article
Physics, Multidisciplinary
Bibhas Kumar Dutta, Pradipta Panchadhyayee
Summary: We propose two schemes to demonstrate PT-antisymmetry in a four-level N-type atomic system interacting with two strong driving fields and a weak probe field. By using a double-channel Gaussian beam for one driving field and a single-channel Gaussian beam for the other driving field in different field configurations, the required spatially modulated coherence for PT-antisymmetry is achieved. In each scheme, PT-antisymmetry can be obtained in the spatial domain for equal and opposite detunings of the double-channel Gaussian beam. This method is unique in providing control over PT-antisymmetry for both homogeneously and inhomogeneously broadened atoms.
Article
Mathematics, Interdisciplinary Applications
Si-Liu Xu, Min Zhu, Jia-Xin Peng, Xi Fan, Qi-Hong Huang, Chun-Bo Hua, Yuan Zhao
Summary: This research proposes a scheme for creating stable light bullets in a cold Rydberg atomic gas system with PT symmetry moire optical lattices. By utilizing local and nonlocal Kerr nonlinearities and PT symmetry moire optical lattices, the researchers were able to obtain stable light bullets with different spatial and temporal distributions. The stability of the light bullets was evaluated through linear-stability analysis and direct simulation.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Optics
Chang-Long Zhu, Yu-Long Liu, Lan Yang, Yu-Xi Liu, Jing Zhang
Summary: This study presents a mechanism for achieving synchronization of mechanical modes in two coupled optomechanical resonators with a parity-time (PT)-symmetric structure. It is shown that decreasing the coupling strength between the resonators can increase the degree of synchronization between mechanical modes. Additionally, the presence of stochastic noises near the exceptional point can enhance the synchronization of the system within a specific parameter regime.
PHOTONICS RESEARCH
(2021)
Article
Engineering, Electrical & Electronic
Irfan Ullah, Siraj Munir, Imran Khan, Aizaz Khan, Bakht Amin Bacha, Waqar Ahmad
Summary: The manuscript discusses the coherent control of anomalous optical drag in a three-level atomic medium. Anomalous optical drag typically occurs in a medium with a negative group index and faster group velocity. The study investigates the effect of probe field detuning, decay rates, and Rabi frequency of the control field on the anomalous optical drag. The results show that a maximum linear anomalous photon drag of -100 μm is achieved with a control field in a medium moving at a velocity of 10 m/s. The ability to control and manipulate anomalous optical drag has potential applications in optical device design and sensing technology.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Physical
Christopher Stopera, Jorge A. Morales
Summary: In this work, we have improved an earlier rotational coherent state (CS) set to obtain a temporally stable (TS) CS set for symmetric rotors, which is applicable for reconstructing quantum rotational properties from classical-mechanics simulations. By incorporating action-angle-related phase factors into two parameters of the original CS set, we have achieved temporal stability. Computer simulations of a rotating benzene molecule represented with the CS set demonstrate key properties of the new set and its potential applications in various fields.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Optics
D. G. Pires, N. M. Litchinitser, P. A. Brandao
Summary: The statistical properties of partially coherent optical vortex beams scattered by a PT dipole are investigated, showing that the radiated pattern strongly depends on the coherence properties of the incident beam and the non-Hermitian properties of the dipole. The spectral density for the scattered radiation is ruled by two terms, one associated to the vortex structure and the other independent of the topological charge, dictating the directional properties of the scattered radiation. Depending on the gain and loss present in the dipole, the system may scatter light in some preferable directions, accompanied by a change in the spectral degree of coherence of the scattered field.
Article
Physics, Multidisciplinary
D. Haji Taghi Tehrani, M. Solaimani, Mahboubeh Ghalandari, B. Babayar-Razlighi
Summary: In this research, the propagation of solitons in a saturable PT-symmetric fractional system is studied by solving the nonlinear fractional Schrodinger equation. Three numerical methods are used - Monte Carlo based Euler-Lagrange variational schema, split-step method, and extrapolation approach - and show good agreement and accuracy. The effects of various parameters on physical properties of the systems are considered.
Article
Nanoscience & Nanotechnology
Fangfang Ju, Chen Liu, Ying Cheng, Shengyou Qian, Xiaojun Liu
Summary: This study extends parity-time symmetric systems to acoustics by using coupled Mie resonators, achieving PT symmetry with only passive materials. Coherent perfect absorption is observed in the PT symmetric phase, showcasing potential applications in tunable noise control and acoustic modulators.
Article
Physics, Applied
Kaiyun Zhan, Tingjun Zhao, Qixuan Chen, Qian Zhang, Xinyue Kang
Summary: The study demonstrates that photonic lattices can support optical Zitterbewegung motion with controllable oscillation amplitude. The nonorthogonality of the Floquet-Bloch modes imposed by the non-Hermitian nature of the dynamics significantly affects the wave oscillation dynamics, with the phenomenon showing robustness to perturbations of the gain parameter.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Geza Levai
Summary: In this study, exactly solvable potentials are derived from the formal solutions of the confluent Heun equation, with conditions for PT symmetry identified. The symmetrical canonical form of the equation is found to be more suitable for implementing PT symmetry. The potentials obtained depend on twelve parameters and include Natanzon-class potentials as special cases. Comparison with earlier research shows the importance of considering the symmetrical canonical form for PT symmetry.
Article
Materials Science, Multidisciplinary
Dong Zhao, Guopeng Zhou, Yang Wang, Fanghua Liu, Haihong Xu, Hao Ni
Summary: Coherent perfect absorption laser points (CPA-LPs) are investigated in Thue-Morse (Th-M) PT-symmetric photonic crystals. The operating wavelengths of CPA-LPs are dependent on the Th-M sequence number, incident angle, and gain-loss factor of materials, supporting double-wavelength lasers. This study is helpful for potential applications in lasers and highly sensitive sensors.
RESULTS IN PHYSICS
(2022)
Article
Optics
Shun Liang, Zhenzhi Liu, Shaohuan Ning, Yanpeng Zhang, Zhaoyang Zhang
Summary: We have experimentally demonstrated the realization of an instantaneously reconfigurable Lieb photonic lattice in a three-level Λ-type rubidium atomic configuration. The lattice is optically induced by a coupling field possessing a spatially periodic intensity distribution under the condition of electromagnetically induced transparency. The observed probe beam at the output surface of the medium exhibits the same Lieb pattern, verifying the formation of the refractive index with a Lieb profile inside the atomic vapor cell. The potential wells and the band structure of the Lieb photonic lattice can be effectively manipulated by easily tuning the frequency of the involved laser beams. This work paves the way for exploring the exotic dynamics and tunable photonic devices in Lieb photonic lattices.
Article
Nanoscience & Nanotechnology
Zhicheng Xiao, Andrea Alu
Summary: The study explores a hybrid parity-time and anti-parity-time symmetric system that supports highly tunable Fano resonances. This system can be implemented in nanophotonic and microwave circuits for real-time control of scattering line shapes, demonstrating the opportunities enabled by non-Hermitian platforms in controlling scattering line shapes for various photonic, electronic, and quantum systems. The potential applications include high-resolution imaging, switching, sensing, and multiplexing.
Article
Optics
Hua Jin, Zhi-Bo Yang, Jing-Wen Jin, Jian-Yu Liu, Hong-Yu Liu, Rong-Can Yang
Summary: This study proposes a scheme for generating amplification in a magnomechanical system, which can be tuned under strong control and weak probe field. The study also discovers the phenomenon of slow-light propagation and suggests potential applications in sensitive optical switches.
Article
Mathematics, Applied
Cemile Nur
Summary: This paper investigates the eigenvalues of non-self-adjoint Sturm-Liouville operators with Dirichlet boundary conditions for a PT-symmetric optical potential, particularly when |c|=| root 1-4V(2)<2 or correspondingly 0 <= V < root 5-/2. Estimates for the eigenvalues are provided, and the results are compared with the periodic and antiperiodic eigenvalues of the Schr & ouml;dinger operator. The complex eigenvalues are approximated using the roots of polynomials, and a numerical example with error analysis is presented.
BOUNDARY VALUE PROBLEMS
(2023)
Article
Optics
J. F. Wang, J. T. Sheng, S. N. Zhu, M. Xiao
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2013)
Article
Optics
Jiteng Sheng, Min Xiao
LASER PHYSICS LETTERS
(2013)
Article
Physics, Multidisciplinary
Utsab Khadka, Jiteng Sheng, Xihua Yang, Min Xiao
NEW JOURNAL OF PHYSICS
(2012)
Article
Optics
Xue Mei Su, Jiteng Sheng, Min Xiao
OPTICS COMMUNICATIONS
(2014)
Article
Optics
Jiteng Sheng, Junfeng Wang, Min Xiao
Article
Physics, Multidisciplinary
Utsab Khadka, Jiteng Sheng, Min Xiao
PHYSICAL REVIEW LETTERS
(2013)
Article
Physics, Multidisciplinary
Bing He, A. V. Sharypov, Jiteng Sheng, Christoph Simon, Min Xiao
PHYSICAL REVIEW LETTERS
(2014)
Article
Physics, Applied
Xinrui Wei, Jiteng Sheng, Yuelong Wu, Wuming Liu, Haibin Wu
APPLIED PHYSICS LETTERS
(2019)
Article
Physics, Multidisciplinary
Jiteng Sheng, Xinrui Wei, Cheng Yang, Haibin Wu
PHYSICAL REVIEW LETTERS
(2020)
Article
Multidisciplinary Sciences
Cheng Yang, Xinrui Wei, Jiteng Sheng, Haibin Wu
NATURE COMMUNICATIONS
(2020)
Article
Multidisciplinary Sciences
Jiteng Sheng, Cheng Yang, Haibin Wu
Summary: This study experimentally demonstrated a coupled-mode heat engine in a two-membrane-in-the-middle cavity optomechanical system, utilizing the normal mode of the cavity-mediated strongly coupled nanoresonators for an Otto cycle. The correlation of two membranes was shown to play a substantial role during the thermodynamic cycle. By manipulating normal modes, a straight-twin nanomechanical engine was successfully implemented.
Article
Multidisciplinary Sciences
Qiankun Zhang, Cheng Yang, Jiteng Sheng, Haibin Wu
Summary: In this study, we experimentally demonstrate a mechanism of generating phonon lasers from the dissipative coupling and reveal the differences between our method and conventional phonon lasers. The findings can be applied to various disciplines such as optics, acoustics, and quantum many-body physics.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Multidisciplinary Sciences
Xinyi Ren, Jin Pan, Ming Yan, Jiteng Sheng, Cheng Yang, Qiankun Zhang, Hui Ma, Zhaoyang Wen, Kun Huang, Haibin Wu, Heping Zeng
Summary: The authors report an approach to ultrasensitive multiplexed gas sensing by integrating dual-comb spectroscopy with cavity optomechanics. This approach allows for high-resolution broadband overtone spectra measurements and offers possibilities for multi-species trace gas detection.
NATURE COMMUNICATIONS
(2023)
Review
Multidisciplinary Sciences
Jiteng Sheng, Cheng Yang, Haibin Wu
Summary: Classical thermodynamics deals with systems in equilibrium or near equilibrium, while nonequilibrium thermodynamics provides a general framework for understanding nonequilibrium processes, especially in small systems that are far-from-equilibrium and dominated by thermal or quantum fluctuations. Cavity optomechanical systems have great potential for studying nonequilibrium thermodynamics due to their high controllability, excellent mechanical performance, and ability to operate in the quantum regime. This article provides an overview of recent advancements in nonequilibrium thermodynamics with cavity optomechanical systems, focusing on experimental results in entropy production assessment, fluctuation theorems, heat transfer, and heat engines.
FUNDAMENTAL RESEARCH
(2023)
