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1,060 results on '"Liu, Jia-Ming"'

1. LAMOST medium-resolution spectroscopic survey of binarity and exotic star (LAMOST-MRS-B): Observation strategy and target selection

Author

Li, Jiao, Li, Jiang-Dan, Guo, Yan-Jun, Han, Zhan-Wen, Chen, Xue-Fei, Liu, Chao, Ge, Hong-Wei, Jiang, Deng-Kai, Li, Li-Fang, Zhang, Bo, Liu, Jia-Ming, Tian, Hao, Zhang, Hao-Tong, Yuan, Hai-Long, Cui, Wen-Yuan, Ren, Juan-Juan, Cai, Jing-Hao, and Shi, Jian-Rong

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

LAMOST-MRS-B is one of the sub-surveys of LAMOST medium-resolution (R~7500) spectroscopic survey. It aims at studying the statistical properties (e.g., binary fraction, orbital period distribution, mass ratio distribution) of binary stars and exotic stars. We intend to observe about 30000 stars (10 mag <= G <= 14.5 mag) with at least 10 visits in five years. We first planned to observe 25 plates around the galactic plane in 2018. Then the plates were reduced to 12 in 2019 because of the limitation of observation. At the same time, two new plates located at the high galactic latitude were added to explore binary properties influenced by the different environments. In this survey project, we set the identified exotic and low-metallicity stars with the highest observation priorities. For the rest of the selected stars, we gave higher priority to the relatively brighter stars in order to obtain high-quality spectra as many as possible. Spectra of 49129 stars have been obtained in LAMOST-MRS-B field and released in DR8, of which 28828 and 3375 stars have been visited more than twice and ten times with SNR >= 10, respectively. Most of the sources are B-, A-, and F-type stars with 0.6 < [Fe/H] < 0.4 dex. We also obtain 347 identified variable and exotic stars and about 250 stars with [Fe/H] < 1 dex. We measure radial velocities (RVs) by using 892233 spectra of the stars. The uncertainties of RV achieve about 1 km/s and 10 km/s1 for 95% of late- and early-type stars, respectively. The datasets presented in this paper are available at http://www.doi.org/10.57760/sciencedb.j00113.00035.

Published
2022
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38. Mesoscopic chaos mediated by Drude electron-hole plasma in silicon optomechanical oscillators

Author

Wu, Jiagui, Huang, Shu-Wei, Huang, Yongjun, Zhou, Hao, Yang, Jinghui, Liu, Jia-Ming, Yu, Mingbin, Lo, Guoqiang, Kwong, Dim-Lee, Duan, Shukai, and Wong, Chee Wei

Subjects
Physics - Optics, Nonlinear Sciences - Chaotic Dynamics
Abstract

Chaos has revolutionized the field of nonlinear science and stimulated foundational studies from neural networks, extreme event statistics, to physics of electron transport. Recent studies in cavity optomechanics provide a new platform to uncover quintessential architectures of chaos generation and the underlying physics. Here we report the generation of dynamical chaos in silicon-based monolithic optomechanical oscillators, enabled by the strong and coupled nonlinearities of two-photon-absorption induced Drude electron-hole plasma. Deterministic chaotic oscillation is achieved, and statistical and entropic characterization quantifies the chaos complexity at 60 fJ intracavity energies. The correlation dimension D2 is determined at 1.67 for the chaotic attractor, along with maximal Lyapunov exponent rate about 2.94 the fundamental optomechanical oscillation for fast adjacent trajectory divergence. Nonlinear dynamical maps demonstrate the subharmonics, bifurcations, and stable regimes, along with distinct transitional routes into chaos. This provides a CMOS-compatible and scalable architecture for understanding complex dynamics on the mesoscopic scale., Comment: 12 pages,4 figures

Published
2016
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39. Mesoscopic chaos mediated by Drude electron-hole plasma in silicon optomechanical oscillators

Author

Wu, Jiagui, Huang, Shu-Wei, Huang, Yongjun, Zhou, Hao, Yang, Jinghui, Liu, Jia-Ming, Yu, Mingbin, Lo, Guoqiang, Kwong, Dim-Lee, Duan, Shukai, and Wei Wong, Chee

Subjects
Quantum Physics, Physical Sciences, physics.optics, nlin.CD
Abstract

Chaos has revolutionized the field of nonlinear science and stimulated foundational studies from neural networks, extreme event statistics, to physics of electron transport. Recent studies in cavity optomechanics provide a new platform to uncover quintessential architectures of chaos generation and the underlying physics. Here, we report the generation of dynamical chaos in silicon-based monolithic optomechanical oscillators, enabled by the strong and coupled nonlinearities of two-photon absorption induced Drude electron-hole plasma. Deterministic chaotic oscillation is achieved, and statistical and entropic characterization quantifies the chaos complexity at 60 fJ intracavity energies. The correlation dimension D2 is determined at 1.67 for the chaotic attractor, along with a maximal Lyapunov exponent rate of about 2.94 times the fundamental optomechanical oscillation for fast adjacent trajectory divergence. Nonlinear dynamical maps demonstrate the subharmonics, bifurcations and stable regimes, along with distinct transitional routes into chaos. This provides a CMOS-compatible and scalable architecture for understanding complex dynamics on the mesoscopic scale.

Published
2017

48. Family of graphene-assisted resonant surface optical excitations for terahertz devices

Author

Lin, I-Tan, Liu, Jia-Ming, Tsai, Hsin-Cheng, Wu, Kaung-Hsiung, Syu, Jheng-Yuan, and Su, Ching-Yuan

Subjects
Physical Sciences, Engineering, Nanotechnology, Condensed Matter Physics
Abstract

The majority of the proposed graphene-based THz devices consist of a metamaterial that can optically interact with graphene. This coupled graphene-metamaterial system gives rise to a family of resonant modes such as the surface plasmon polariton (SPP) modes of graphene, the geometrically induced SPPs, also known as the spoof SPP modes, and the Fabry-Perot (FP) modes. In the literature, these modes are usually considered separately as if each could only exist in one structure. By contrast, in this paper, we show that even in a simple metamaterial structure such as a one-dimensional (1D) metallic slit grating, these modes all exist and can potentially interact with each other. A graphene SPP-based THz device is also fabricated and measured. Despite the high scattering rate, the effective SPP resonances can still be observed and show a consistent trend between the effective frequency and the grating period, as predicted by the theory. We also find that the excitation of the graphene SPP mode is most efficient in the terahertz spectral region due to the Drude conductivity of graphene in this spectral region.

Published
2016

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