Suna Pang

Beijing Institute of Technology

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Feng Wang

Beijing Institute of Technology

Xiurong Feng

Beijing Institute of Technology

Zehui Liu

Peking University

Fei Mao

University of South China

Jian Wang

Huzhou University

Cong-Zhang Gao

Institute of Applied Physics and Computational Mathematics

Ya-Ting Sun

Harbin Medical University

Xiaoqin Zhang

Chinese Academy of Sciences

Yating Sun

Guiyang Medical University

Xiaoli Wang

Beijing Institute of Technology

Cooperative Institutions

Beijing Institute of Technology

Beijing Normal University

University of Chinese Academy of Sciences

Dalian University of Technology

Pohang University of Science and Technology

Jiangxi Agricultural University

Peking University

Harbin Medical University

Lanzhou University of Technology

Beijing University of Technology

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Carrier-envelope phase effects on the reflectance of diamond films irradiated by ultrashort single-cycle light pulses: A comparison study in attosecond and femtosecond regimes

Physics Letters A (2024)

Xiurong Feng Feng Wang Suna Pang Cong-Zhang Gao Jian Wang

Attosecond

Carrier-envelope phase

Envelope (radar)

Femto-

10.1016/j.physleta.2024.129973

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Controlling energy transfer from intense ultrashort light pulse to crystals: A comparison study in attosecond and femtosecond regimes

Physics Letters A (2020)

Xiaoqin Zhang Feng Wang Zehui Liu Xiurong Feng Suna Pang

Attosecond

Photon energy

10.1016/j.physleta.2020.126710

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Citations (7)

First-principles simulation of intense single-cycle ultrashort light pulses interacting with diamond: Comparison study in attosecond and femtosecond regimes

Physical review. B./Physical review. B (2021)

Xiurong Feng Feng Wang Suna Pang Zehui Liu Xiaowei Sheng

The interaction of intense single-cycle ultrashort (0.1 to 9 fs) light pulses with diamond crystal and thin film is simulated, combining the dependent Kohn-Sham equation with the Maxwell equations. Distinct features are observed depending on the duration of the pulse. In the diamond crystal, maximum energy transfer from light pulse is observed with a pulse duration 0.3 fs. In this case, the phase of current density $J(t)$ coincides with that of the electric field $E(t)$. For the incident pulse of duration 0.1 fs, most of the light will transmit on passing the thin film. But for the pulse of duration 0.5 fs, there is more reflection than transmission. For light pulses of durations 7 and 9 fs in diamond crystal, traditional nonlinear behavior of energy transfer are observed. Interestingly, for the attosecond pulse, there is a linear scaling behavior with the pulse intensity below ${10}^{16}\phantom{\rule{4pt}{0ex}}\mathrm{W}/{\mathrm{cm}}^{2}$ on the one hand and an unusual linear dynamic interference response behavior with the pulse width, determined by the interference of the different quantum pathways, on the other hand.

Attosecond

Pulse duration

Reflection

Crystal (programming language)

10.1103/physrevb.104.054308

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Citations (5)

First-principles simulation of the electronic stopping power of He ions in Al at finite temperature

Physical review. A/Physical review, A (2022)

Suna Pang Feng Wang Ya-Ting Sun Fei Mao Xiaoli Wang

The electronic stopping power of low-energy He projectile particles moving through an Al film under channeling and off-channeling trajectories and its temperature dependence are studied by combining the time-dependent density-functional-theory method with molecular dynamics simulations. The results show that the effect of target temperature on target stopping power can be divided into two aspects which are derived from the target electron and target ion. Below 500 K, the effect of the target-electron temperature on target stopping power is almost negligible. The influence of the target-ion temperature on target stopping power can be divided into two aspects which are derived from the displacement and energy dissipation of target ions. The displacement of the target ion can result in two trends that change the target stopping power: (1) The target ion is closer to the center of lattice channel after displacement, which leads to the increase of target stopping power. (2) The target ion is farther away from the center of the lattice channel after displacement, which leads to the decrease in target stopping power. As the temperature increases, the target ions are more likely to appear farther away from the lattice channel than closer to the center of the lattice channel, so the average displacement of the target ions will lead to a decreasing trend of the target stopping power with the increase of temperature. Under the condition of a given ionic density in the target, the energy dissipation capacity of target ions increases with the increase of temperature, resulting in the tendency of the target stopping power to increase with the increase of temperature. Our calculated stopping powers are in good agreement with the experimental data and reproduced the deviation from velocity proportionality found in the experimental results for a ${\mathrm{He}}^{+}$ ion in Al, validating our approach and numerical implementation.

Stopping power

Lattice (music)

Power density

10.1103/physreva.105.032803

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Citations (3)

Effects of semicore electrons on stopping power in helium-irradiated aluminum nanosheets

Physical Chemistry Chemical Physics (2023)

Suna Pang Feng Wang Ya-Ting Sun Fei Mao Cong-Zhang Gao

The stopping power of energetic He ions traversing an Al film is studied by combining the time-dependent density-functional theory method with molecular dynamics simulations. We investigated the dependence of the semicore electron excitation of the Al film on the projectile's trajectory and its charge state. Our results show that for the off-channeling trajectories the semicore electrons contribute significantly to the stopping power of the Al film as the He+ ion velocity exceeds 1.0 a.u, and in contrast, it is negligible for the channeling trajectories. Most importantly, we found two unexpected effects of semicore electrons on the stopping power in helium-irradiated aluminum nanosheets, i.e., (1) the semicore electrons can contribute to the energy loss for both high and low energy projectiles under the off-channeling trajectory; (2) as the projectile velocity increases from 0.4 a.u. to 2.0 a.u. although semicore electron excitation (including transition in the target, ionization away from the target and transfer to the projectile ion) of the target atom is gradually inhibited, the influence of semicore electrons on valence electron excitation is gradually enhanced. Our finding allows us to gain new insights into the stopping of ions in metals.

Stopping power

10.1039/d3cp01506h

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Controlling dielectric properties of cBN by an ultrashort double-pulse light

Physics Letters A (2019)

Xiao-Shuang Kong Feng Wang Xiaoqin Zhang Zehui Liu Suna Pang

Light Field

10.1016/j.physleta.2019.126125

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Citations (2)

Novel All-Nitrogen Molecular Crystals Composed of Tetragonal N4 Molecules

International Journal of Molecular Sciences (2022)

Suna Pang Feng Wang

A computational study promises insight into molecular crystals consisting of the tetrahedral form of N4 molecules (Td-N4). Here, our efforts are focused on theoretically predicting the existence of the molecular crystals consisting of Td-N4 molecules. On the basis of the first principles of Born–Oppenheimer molecular dynamics under constant temperature and pressure, and geometry optimizations under hydrostatic pressures without any constrained parameters, molecular crystals consisting of Td-N4 molecules were confirmed to be dynamically and thermally metastable. Our analysis shows that, with high detonation performance and high stability, these Td-N4 molecular crystals can indeed be potential candidates as high-energy density explosives.

Metastability

Tetragonal crystal system

Hydrostatic pressure

Tetrahedron

Molecular solid

Solid nitrogen

Crystal Structure Prediction

10.3390/ijms23105503

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Citations (2)

Charge-state effects on charge transfer of helium ions in gold nanosheet

New Journal of Physics (2023)

Yating Sun Feng Wang Suna Pang Fei Mao Chenguang Li

Abstract We investigate the charge-state effects on charge transfer of helium ions in gold nanosheet using the time-dependent density functional theory non-adiabatically coupled to the molecular dynamics. In order to characterize and extract the charge-state information of incident particles inside the nanosheet, we develop two novel computational methods. It is found that the charge transfer behavior of He ion in gold nanosheet is sensitive to its charge state at the time of incident. Analysis of these results allows us to gain new insights in the interaction between He ions and gold nanosheet. This work validates the ability of current methodology in dealing with ion collisions in materials.

Nanosheet

10.1088/1367-2630/aceea5

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Citations (2)