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Title: Electronic band structure effects in the stopping of protons in copper [Electronic band structure non-linear effects in the stopping of protons in copper]

Journal Article · · Physical Review B
 [1];  [1];  [2]
  1. Florida A&M Univ., Tallahassee, FL (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Here, we present an ab initio study of the electronic stopping power of protons in copper over a wide range of proton velocities v = 0.02–10a.u. where we take into account nonlinear effects. Time-dependent density functional theory coupled with molecular dynamics is used to study electronic excitations produced by energetic protons. A plane-wave pseudopotential scheme is employed to solve the time-dependent Kohn-Sham equations for a moving ion in a periodic crystal. The electronic excitations and the band structure determine the stopping power of the material and alter the interatomic forces for both channeling and off-channeling trajectories. Our off-channeling results are in quantitative agreement with experiments, and at low velocity they unveil a crossover region of superlinear velocity dependence (with a power of ~1.5) in the velocity range v = 0.07–0.3a.u., which we associate to the copper crystalline electronic band structure. The results are rationalized by simple band models connecting two separate regimes. We find that the limit of electronic stopping v → 0 is not as simple as phenomenological models suggest and it is plagued by band-structure effects.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; NA0002630
OSTI ID:
1342054
Alternate ID(s):
OSTI ID: 1328545
Report Number(s):
LLNL-JRNL-680464; PRBMDO; TRN: US1701572
Journal Information:
Physical Review B, Vol. 94, Issue 15; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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Cited By (5)

Heavy ion ranges from first-principles electron dynamics journal April 2019
Effect of resonant coherent excitation on the electronic stopping of slow channeled ions journal November 2019
Electronic energy-loss mechanisms for H, He, and Ne in TiN journal September 2017
Electronic stopping and proton dynamics in InP, GaP, and In0.5Ga0.5P from first principles journal October 2018
Electronic stopping and proton dynamics in InP, GaP, and In$_{0.5}$Ga$_{0.5}$P from first principles text January 2018