Weici Liu

Guangzhou Vocational College of Science and Technology

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Faqiang Wang

South China Normal University

Ruisheng Liang

Guangzhou Vocational College of Science and Technology

Zhongchao Wei

South China Normal University

Hongyun Meng

Xidian University

Songhao Liu

Xinjiang Institute of Ecology and Geography

Hongzhan Liu

University of Science and Technology of China

Jie Feng

Zhejiang University

Liang Ruisheng

Haoxian Li

South China Normal University

Wencheng Xu

Hubei Provincial Hospital of Traditional Chinese Medicine

Cooperative Institutions

South China Normal University

Guangzhou Vocational College of Science and Technology

Beijing Institute of Technology

Chinese Academy of Sciences

Sun Yat-sen University

Zhejiang University

Shandong University

University of Science and Technology of China

Nankai University

Guangdong University of Technology

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Ported from Self-Similar Analytic Solutions of Ginzburg–Landau Equation with Varying Coefficients

Chinese Physics Letters (2008)

Jie Feng Wencheng Xu Shuxian Li Weici Liu Songhao Liu

Employing the technique of symmetry reduction of analytic method, we solve the Ginzburg–Landau equation with varying nonlinear, dispersion, gain coefficients, and gain dispersion which originates from the limiting effect of transition bandwidth in the realistic doped fibres. The parabolic asymptotic self-similar analytical solutions in gain medium of the normal GVD is found for the first time to our best knowledge. The evolution of pulse amplitude, strict linear phase chirp and effective temporal width are given with self-similarity results in longitudinal nonlinearity distribution and longitudinal gain fibre. These analytical solutions are in good agreement with the numerical simulations. Furthermore, we theoretically prove that pulse evolution has the characteristics of parabolic asymptotic self-similarity in doped ions dipole gain fibres.

10.1088/0256-307x/25/3/045

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Design of Intelligent Charger System

Yunting Wu Weici Liu Ruisheng Liang

In this paper, an intelligent charging system which is based on single-chip microcomputer system is introduced. The hardware and software realization of intelligent battery charger based on MCU are presented. The charger studied in this paper has higher practical value and accumulates a lot of practical experience for further research in the future.

Realization (probability)

Micro computer

Battery charger

10.2991/msbda-19.2019.62

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Waiting Time Distributions of Transport through a Two-Channel Quantum System

Applied Sciences (2020)

Weici Liu Faqiang Wang Ruisheng Liang

In this work, the waiting time distribution (WTD) statistics of electron transport through a two-channel quantum system in a strong Coulomb blockade regime and non-interacting dots are investigated by employing a particle-number resolved master equation with the Born–Markov approximation. The results show that the phase difference between the two channels, the asymmetry of the dot-state couplings to the left and right electrodes, and Coulomb repulsion have obvious effects on the WTD statistics of the system. In a certain parameter range, the system manifests the coherent oscillatory behavior of WTDs in the strong Coulomb blockade regime, and the phase difference between the two channels is clearly reflected in the oscillation phase of the WTDs. The two-channel quantum dot (QD) system for non-interacting dots manifests nonrenewal characteristics, and the electron waiting time of the system is negatively correlated. The different phase differences between the two channels can clearly enhance the negative correlation. These results deepen our understanding of the WTD statistical properties of electron transport through a mesoscopic QD system and help pave a new path toward constructing nanostructured QD electronic devices.

Mesoscopic physics

Coulomb blockade

Oscillation (cell signaling)

10.3390/app10051772

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「変化する係数を持つGinzburg‐Landau方程式の自己相似解析解からのPorted」についてのコメントへの回答【Powered by NICT】

Chinese Physics Letters (2009)

Feng Jie Wencheng Xu LI Shu-Xian Weici Liu Songhao Liu

Porting

Source

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Negative Differential Conductance Assisted by Optical Fields in a Single Quantum Dot with Ferromagnetic Electrodes

Nanomaterials (2019)

Weici Liu Faqiang Wang Zhilie Tang Ruisheng Liang

In a single quantum dot (QD) system connected with ferromagnetic electrodes, the electron transport properties, assisted by the thermal and Fock state optical fields, are theoretically studied by the Keldysh nonequilibrium Green's function approach. The results show that the evolution properties of the density of state and tunneling current assisted by the Fock state optical field, are quite different from those of the thermal state. The photon sideband shift decreases monotonously with the increase in the electron-photon coupling strength for the case of the thermal state, while the shift is oscillatory for the case of the Fock state. Negative differential conductance (NDC) appears obviously in a QD system contacted with parallel (P) and antiparallel (AP) magnetization alignment of the ferromagnetic electrode leads, assisted by the Fock state optical field in a wide range of electron-photon interaction parameters. Evident NDC usually only arises in an AP configuration QD system assisted by the thermal state optical field. The results have the potential to introduce a new way to actively manipulate and control the single-electron tunneling transport on a QD system by the quantum states of the optical field.

10.3390/nano9060863

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Flexible Control of Two-Channel Transmission and Group Delay in an Optomechanical System with Double Quantum Dots Driven by External Field

Nanomaterials (2021)

Faqiang Wang Weici Liu Zhongchao Wei Hongyun Meng Hongzhan Liu

With the presence of a driving field applied to double quantum dots and a control field applied on the cavity, the transmission performance and group delay effect of a probe field have been theoretically studied in a hybrid optomechanical system (HOMS). Due to the interaction between the mechanical mode and the double quantum dots system, double optomechanically induced transparency (OMIT) arises in the HOMS. With the assistance of a driving field, the system can be tuned to switch on any one of the two OMIT windows, switch on both of the two OMIT windows or switch off both of the two OMIT windows by dynamically adjusting control of the optical field and the driving field. Furthermore, the transmitted probe fields of the two OMIT windows can be tuned to be absorbed or amplified with proper parameters of the driving field and control field. Moreover, the transmission properties of the two OMIT windows are asymmetrical. One can obtain the maximum group delay time of the probe field by optimizing the amplitude and phase of the driving field. These results provide a new way for constructing optically controlled nanostructured photonic switch and storage devices.

Phase control

Slow Light

10.3390/nano11061554

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Concurrence evolution of two qubits coupled with one-mode cavity separately

Chinese Physics B (2010)

Weici Liu Wang Fa-Qiang Ruisheng Liang

The concurrence evolution of two qubits coupled with one-mode cavity separately is investigated exactly without adopting the rotating-wave approximation. The results show that for the resonant case, the concurrence evolution behaviour of the system is similar to that of the Markovian case when the coupling strength is weak, while the concurrence vanishes in a finite time and might revive fractional initial entanglement before it permanently vanishes when the coupling strength is strong. And for the detuning case, the entanglement could periodically recover after complete disentanglement. These results are quite different from those of system subjected to Jaynes–Cummings model.

Concurrence

Mode (computer interface)

10.1088/1674-1056/19/9/094204

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Propagation properties of self-similar pulses in normal-dispersion fiber amplifiers

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2007)

Shuxian Li Wen‐Cheng Xu Jie Feng Weici Liu

Self-similar pulse propagation properties in Yb⁺³-doped fiber amplifiers with the effects of higher-order dispersion and gain dispersion have been studied in this paper. The effects of initial pulse energy, third-order dispersion and the doped ions dipole relaxation time on the pulse propagation quality are relatively expounded with the analytical and simulative methods. It is shown that with nonlinear area of parabolic pulses being enlarged, the center of chirp moves forward or backward, due to the difference of third-order dispersion coefficient. And the figure of pulses is distorted with the pulse peak delaying to one side and the center location excursing. Gain dispersion can be a filter, which can properly compress pulse-width. Results proved the possibility of the self-similar pulse existing in gain medium with a certain relaxation time.

Chirp

10.1117/12.743351

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Laser thermal lens measurement based on Michelson interferometer

2019 4th International Conference on Mechanical, Control and Computer Engineering (ICMCCE) (2020)

Lei Qi Jinzhi Huang Shuyun Zhan Weici Liu Hongjie Zhu

In this paper, a laser thermal lens measuring device which is based on equal inclination interference fringes produced by Michelson interferometer is realized. In this experiment, the thermal effect of low power laser can be observed as the ink sample after dilution has good endothermic properties. The experimental results show that the number of bright and dark rings is 6 in the absence of medium. With the increase of the concentration of the ink sample, the number of dark rings is also changing, and the spacing is relatively larger. Therefore, the thermal lens effect of laser can be observed by adjusting device. The focal length of the thermal lens is also calculated. The device has high application value in the study of laser thermal lens effect and medium absorption.

10.1109/icmcce51767.2020.00148

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The Research on Propagation of Ultrashort Pulse in Normal Group-velocity Dispersion Fiber

Weici Liu Wenxia Hu Zhijun Xie Yuwang Liu

Group velocity

10.2991/seeie-19.2019.48

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