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arXiv 2022年

作者： Martínez-Tapia, Áulide Corona-Aquino, Samuel You, Chenglong Jin, Rui-Bo Magaña-Loaiza, Omar S. Dong, Shi-Hai U’Ren, Alfred B. León-Montiel, Roberto de J. Instituto de Ciencias Nucleares Universidad Nacional Autónoma de México Apartado Postal 70-543 Cd. Mx.04510 Mexico Quantum Photonics Laboratory Department of Physics & Astronomy Louisiana State University Baton RougeLA70803 United States Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Research Center for Quantum Physics Huzhou University Huzhou313000 China Laboratorio de Ciencias de la Informacion Cuantica CIC Instituto Politecnico Nacional UPALM C.P CDMX07700 Mexico

Recent investigations suggest that the use of non-classical states of light, such as entangled photon pairs, may open new and exciting avenues in experimental two-photon absorption spectroscopy. Despite several experimental studies of entangled two-photon absorption (eTPA), there is still a heated debate on whether eTPA has truly been observed. This interesting debate has arisen, mainly because it has been recently argued that single-photon-loss mechanisms, such as scattering or hot-band absorption may mimic the expected entangled-photon linear absorption behavior. In this work, we focus on transmission measurements of eTPA, and explore three different two-photon quantum interferometers in the context of assessing eTPA. We demonstrate that the so-called N00N-state configuration is the only one amongst those considered insensitive to linear (single-photon) losses. Remarkably, our results show that N00N states may become a potentially powerful tool for quantum spectroscopy, and place them as a strong candidate for the certification of eTPA in an arbitrary sample. Copyright © 2022, The Authors. All rights reserved.

关键词： Particle beams

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Distinction of Electron Dispersion in Time-Resolved Photoemission Spectroscopy

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Physical Review Letters 2020年第4期125卷 043201-043201页

作者： Qing Liao Wei Cao Qingbin Zhang Kai Liu Feng Wang Peixiang Lu Uwe Thumm Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan 430074 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800 China Department of Physics Kansas State University Manhattan Kansas 66506 USA

While recent experiments provided compelling evidence for an intricate dependence of attosecond photoemission-time delays on the solid’s electronic band structure, the extent to which electronic transport and dispersion in solids can be imaged in time-resolved photoelectron (PE) spectra remains poorly understood. Emphasizing the distinction between photoemission time delays measured with two-photon, two-color interferometric spectroscopy, and transport times, we demonstrate how the effect of energy dispersion in the solid on photoemission delays can, in principle, be observed in interferometric photoemission. We reveal analytically a scaling relation between the PE transport time in the solid and the observable photoemission delay and confirm this relation in numerical simulations for a model system. We trace photoemission delays to the phase difference the PE accumulates inside the solid and, in particular, predict negative photoemission delays. Based on these findings, we suggest a novel time-domain interferometric solid-state energy-momentum-dispersion imaging method.

关键词： Atomic & molecular processes in external fields Electronic excitation & ionization Ultrafast phenomena

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Time-resolving tunneling ionization via strong-field photoelectron holography

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Physical Review A 2019年第3期99卷 033402-033402页

作者： Jia Tan Yueming Zhou Mingrui He Qinghua Ke Jintai Liang Yang Li Min Li Peixiang Lu School of Physics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China

Strong-field tunneling ionization is the initial step for various ultrafast dynamics in intense laser-atom and/or molecule interactions. Time-resolving tunneling ionization is of crucial importance for accurately understanding these ultrafast processes. In our previous work [Phys. Rev. Lett. 121, 253203 (2018).], we proposed an attosecond photoelectron interferometer based on strong-field photoelectron holography to resolve the tunneling ionization. Here, we show more details about how the complex ionization time of tunneling is retrieved with our scheme. We demonstrate that the Coulomb interaction, which is a tedious and complex problem in dealing with photoelectron interference in strong-field ionization, can be safely canceled in our scheme. This is further confirmed by performing our scheme for both the model atoms with short-range and Coulomb potentials. Additionally, the validity and accuracy of our scheme are confirmed by its application in different targets and different laser parameters. Our scheme provides a reliable and versatile method to resolve the time information of strong-field tunneling ionization.

关键词： Atomic & molecular processes in external fields Coherent control Holography Single- and few-photon ionization & excitation

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Attosecond streaking spectrum in the photoionization of the hydrogen molecular ion

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Physical Review A 2019年第4期100卷 043405-043405页

作者： Feng Wang Kai Liu Xiaofan Zhang Zhe Wang Meiyan Qin Qing Liao Peixiang Lu Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China

We investigate the attosecond streaking spectrum of H2+ by numerically solving the time-dependent Schrödinger equation. The results show that the streaking spectrum of H2+ depends sensitively on the internuclear distance R. In addition to the regular streaking structure, some streaking spectra of H2+ with the splitting and distorted structures are also observed as R changes. The splitting and distorted streaking spectra of H2+ are demonstrated to be related to the destructive two-center interference and resonant transition triggered by the IR field, respectively. Meanwhile, the mixture structure of split and distortion on the streaking spectrum of H2+ is attributed to the coupling of the destructive two-center interference and resonant transition. The R-dependent streaking spectra might pave an accessible route toward monitoring the ultrafast nuclear dynamics of molecules.

关键词： Single- and few-photon ionization & excitation

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Ultrafast oscillating-magnetic-field generation based on electronic-current dynamics

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Physical Review A 2019年第1期99卷 013414-013414页

作者： Xiaofan Zhang Xiaosong Zhu Dian Wang Liang Li Xi Liu Qing Liao Pengfei Lan Peixiang Lu Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China

Electronic-current dynamics play an important role in photoinduced processes and magnetooptics. We theoretically demonstrate ultrafast oscillating-magnetic-field generation based on the electronic dynamics from current carrying states irradiated by a nonhelical, linearly polarized laser field. In this driving field, the electronic currents oscillate periodically, which is attributed to the laser-induced energy shift of orbitals. These electronic currents can induce a strong spatial-localized oscillating magnetic field B(r,t) of several tens of Teslas (104 G) at the center of targets. The frequency of the induced magnetic field ranges from terahertz to petahertz and can be continuously adjusted by varying the driving laser intensity. The optically induced oscillating magnetic fields we demonstrated will serve as a potential tool for investigations of the ultrafast dynamics in magnetic materials and chiral media.

关键词： Atomic & molecular processes in external fields Coherent control Ultrafast optics

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MoS2-Based Photodetectors Powered by Asymmetric Contact Structure with Large Work Function Difference

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Nano-Micro Letters 2019年第2期11卷 217-228页

作者： Zhe Kang Yongfa Cheng Zhi Zheng Feng Cheng Ziyu Chen Luying Li Xinyu Tan Lun Xiong Tianyou Zhai Yihua Gao Center for Nanoscale Characterization and Devices(CNCD)Wuhan National Laboratory for Optoelectronics(WNLO)and School of Physics and School of Materials Science and Engineering Huazhong University of Science and Technology(HUST)Luoyu Road 1037Wuhan 430074People’s Republic of China College of Materials and Chemical Engineering China Three Gorges UniversityDaxue Road 8Yichang 443002People’s Republic of China Hubei Key Laboratory of Optical Information and Pattern Recognition School of Optical Information and Energy EngineeringSchool of Mathematics and PhysicsWuhan Institute of TechnologyGuanggu 1st Road 206Wuhan 430205People’s Republic of China

Self-powered devices are widely used in the detection and sensing *** metal contacts provide an effective way to obtain self-powered *** two stable metallic electrode materials with large work function differences is the key to obtain highly efficient asymmetric metal contacts ***,common metal electrode materials have similar and high work functions,making it difficult to form an asymmetric contacts structure with a large work function ***,Mo2C crystals with low work function(3.8 eV) was obtained by chemical vapor deposition(CVD) *** large work function difference between Mo2C and Au allowed us to synthesize an efficient Mo2C/MoS2/Au photodetector with asymmetric metal contact structure,which enables light detection without external electric *** believe that this novel device provides a new direcfor the design of miniature self-powered *** results also highlight the great potential of ultrathin Mo2C prepared by CVD in heterojunction device applications.

关键词： Mo2C MoS2 Chemical vapor deposition Asymmetric metal contacts Photodetector

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Strong field induced electron density tide in high harmonic generation from solids

arXiv

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arXiv 2020年

作者： Li, Liang Zhang, Yinfu Lan, Pengfei Huang, Tengfei Zhu, Xiaosong Zhai, Chunyang Yang, Ke He, Lixin Zhang, Qingbin Cao, Wei Lu, Peixiang Wuhan National Laboratory for Optoelectronics School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai201800 China

In strong laser fields, the electron density in solids can show up tidal motions caused by the laser "pulling" on the electrons, which forms an electron density tide (EDT). However, the strong field processes in solids are always explained by the single-active-electron (SAE) model and the fluctuation of background electrons is neglected previously. Here, we demonstrate the strong field induced EDT effect and propose a model for revealing its role in high harmoinc generation (HHG) from solids. We show that the EDT effect induces an additional polarization current beyond the SAE approximation. It gives a new mechanism for HHG and leads to new anisotropic structures, which are experimentally observed with MgO. Our experiment indicates that the EDT effect becomes more obvious with increasing the laser intensity. Our work establishes the bridge between the HHG and the microscopic EDT in solids induced by the strong laser field, which paves the way to probe the ultrafast electron dynamics. Copyright © 2020, The Authors. All rights reserved.

关键词： Electrons

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Real-time exciton-manipulation of plexcitonic coupling in a ws2-ag nanocavity

arXiv

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arXiv 2020年

作者： Han, Xiaobo Wang, Kai Jiang, Yanan Xing, Xiangyuan Li, Shujin Li, Fang Liu, Weiwei Wang, Bing Lu, Peixiang Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Wuhan National Laboratory for Optoelectronics School of Physics Huazhong University of Science and Technology Wuhan430074 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai201800 China

We demonstrate the real-time exciton-manipulation of plexcitonic coupling in monolayer WS2 coupled to a plasmonic nanocavity by immersing into a mixed solution of dichloromethane (DCM) and ethanol. By adjusting the mixture ratio, a continuous tuning of the Rabi splitting energy ranged from 178 meV (in ethanol) to 266 meV (in DCM) is achieved. The results are mainly attributed to the remarkable increase of the neutral exciton density in monolayer WS2 as the concentration of DCM is increased. It offers an important stepping stone towards a further study on plexcitonic coupling in layered materials, along with potential applications in quantum information processing and nonlinear optical materials. Copyright © 2020, The Authors. All rights reserved.

关键词： Tungsten compounds

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Fingerprint of the interbond electron hopping in second-order harmonic generation

arXiv

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arXiv 2020年

作者： Li, Liang Huang, Tengfei Lan, Pengfei Li, Jiapeng Zhang, Yinfu Zhu, Xiaosong He, Lixin Cao, Wei Lu, Peixiang Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai201800 China

We experimentally explore the fingerprint of the microscopic electron dynamics in second-order harmonic generation (SHG). It is shown that the interbond electron hopping induces a novel source of nonlinear polarization and plays an important role even when the driving laser intensity is two orders of magnitude lower than the characteristic atomic field. Our model predicts distinct anisotropic structures of the SHG yield contributed by the interbond electron hopping, which is identified in our experiments with ZnO crystals. Moreover, a generalized second-order susceptibility with an explicit form is proposed, which provides a unified description in both the perturbative and strong field regimes. Our work reveals the nonlinear responses of materials at the electron scale and extends the perturbation nonlinear optics to a previously unexplored regime, where the nonlinearity related to the interbond electron hopping becomes dominant. It paves the way for realizing controllable nonlinearity on ultrafast time scale. Copyright © 2020, The Authors. All rights reserved.

关键词： Harmonic generation

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Exit momentum and instantaneous ionization rate of nonadiabatic tunneling ionization in elliptically polarized laser fields

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Physical Review A 2019年第5期99卷 053422-053422页

作者： Siqiang Luo Min Li Wenhai Xie Kun Liu Yudi Feng Baojie Du Yueming Zhou Peixiang Lu Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China

Based on the strong-field approximation, we obtain analytical expressions for the initial momentum at the tunnel exit and instantaneous ionization rate of tunneling ionization in elliptically polarized laser fields with arbitrary ellipticity. The tunneling electron reveals a nonzero offset of the initial momentum at the tunnel exit in the elliptically polarized laser field. We find that the transverse and longitudinal components of this momentum offset with respect to the instantaneous field direction are directly related to the time derivatives of the instantaneous laser electric field along the angular and radial directions, respectively. We further show that the nonzero initial momentum at the tunnel exit has a significant influence on the laser phase dependence of the instantaneous ionization rate in the nonadiabatic tunneling regime.

关键词： Atomic & molecular processes in external fields Multiphoton or tunneling ionization & excitation Strong electromagnetic field effects Strong-field approximation

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