Electronic stopping power of slow-light channeling ions in ZnTe from first principles

Chang-kai Li, Fei Mao, Feng Wang, Yan-long Fu, Xiao-ping Ouyang, and Feng-Shou Zhang
Phys. Rev. A 95, 052706 – Published 22 May 2017

Abstract

Nonadiabatic dynamics simulations are performed to investigate the electronic stopping power of a helium ion moving through ZnTe crystalline thin films under channeling conditions. Using ab initio time-dependent density-functional theory, we found by direct simulation that electronic stopping power versus projectile velocity deviates from velocity proportionality and displays a transition between two velocity regimes for helium ions channeling along middle crystalline axes in 100 and 111 channels and also in a 110 channel with low-impact parameters. This transition causes a change in the slope of the energy loss versus ion velocity curve at a characteristic velocity related to the impact parameter and the lattice plane spacing. It may be an indication of extra energy loss channel beyond the electron-hole excitation. To analyze it, we checked the charge transfer between the moving projectiles and host atoms. It is found that the soft transition between two velocity regimes can be attributed to the resonant coherent excitation stimulated by the time-periodic potential experienced by the channeling ion and also the charge exchange in close encounters between Helium ion and host atoms.

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  • Received 24 February 2017

DOI:https://doi.org/10.1103/PhysRevA.95.052706

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Chang-kai Li1,2, Fei Mao3, Feng Wang4, Yan-long Fu1,2, Xiao-ping Ouyang6, and Feng-Shou Zhang1,2,5,*

  • 1The Key Laboratory of Beam Technology and Material Modification of the Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
  • 2Beijing Radiation Center, Beijing 100875, China
  • 3School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
  • 4School of Physics, Beijing Institute of Technology, Beijing 100081, China
  • 5Center of Theoretical Nuclear Physics, National Laboratory of Heavy IonAccelerator of Lanzhou, Lanzhou 730000, China
  • 6Northwest Institute of Nuclear Technology, Xi'an 710024, China

  • *Corresponding author: fszhang@bnu.edu.cn

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Vol. 95, Iss. 5 — May 2017

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