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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]

Abstract

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.

Authors:
 [1];  [1];  [2]
  1. Florida A&M Univ., Tallahassee, FL (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1342054
Alternate Identifier(s):
OSTI ID: 1328545
Report Number(s):
LLNL-JRNL-680464
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1701572
Grant/Contract Number:  
AC52-07NA27344; NA0002630
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 15; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Quashie, Edwin E., Saha, Bidhan C., and Correa, Alfredo A. Electronic band structure effects in the stopping of protons in copper [Electronic band structure non-linear effects in the stopping of protons in copper]. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.155403.
Quashie, Edwin E., Saha, Bidhan C., & Correa, Alfredo A. Electronic band structure effects in the stopping of protons in copper [Electronic band structure non-linear effects in the stopping of protons in copper]. United States. doi:10.1103/PhysRevB.94.155403.
Quashie, Edwin E., Saha, Bidhan C., and Correa, Alfredo A. Wed . "Electronic band structure effects in the stopping of protons in copper [Electronic band structure non-linear effects in the stopping of protons in copper]". United States. doi:10.1103/PhysRevB.94.155403. https://www.osti.gov/servlets/purl/1342054.
@article{osti_1342054,
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]},
author = {Quashie, Edwin E. and Saha, Bidhan C. and Correa, Alfredo A.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.94.155403},
journal = {Physical Review B},
number = 15,
volume = 94,
place = {United States},
year = {2016},
month = {10}
}

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