Imperial College London

Matthew Foulkes

Faculty of Natural SciencesDepartment of Physics

Professor of Physics
 
 
 
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Contact

 

+44 (0)20 7594 7607wmc.foulkes Website

 
 
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Assistant

 

Mrs Carolyn Dale +44 (0)20 7594 7579

 
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Location

 

810Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Horsfield:2016:10.1103/PhysRevB.93.245106,
author = {Horsfield, AP and Lim, A and Foulkes, WMC and Correa, AA},
doi = {10.1103/PhysRevB.93.245106},
journal = {Physical Review. B, Condensed Matter},
title = {Adiabatic perturbation theory of electronic stopping in insulators},
url = {http://dx.doi.org/10.1103/PhysRevB.93.245106},
volume = {93},
year = {2016}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - A model able to explain the complicated structure of electronic stopping at low velocities in insulating materials is presented. It is shown to be in good agreement with results obtained from time-dependent density-functional theory for the stopping of a channeling Si atom in a Si crystal. If we define the repeat frequency f=v/λ, where λ is the periodic repeat length of the crystal along the direction the channeling atom is traveling, and v is the velocity of the channeling atom, we find that electrons experience a perturbing force that varies in time at integer multiples l of f. This enables electronic excitations at low atom velocity, but their contributions diminish rapidly with increasing values of l. The expressions for stopping power are derived using adiabatic perturbation theory for many-electron systems, and they are then specialized to the case of independent electrons. A simple model for the nonadiabatic matrix elements is described, along with the procedure for determining its parameters.
AU - Horsfield,AP
AU - Lim,A
AU - Foulkes,WMC
AU - Correa,AA
DO - 10.1103/PhysRevB.93.245106
PY - 2016///
SN - 0163-1829
TI - Adiabatic perturbation theory of electronic stopping in insulators
T2 - Physical Review. B, Condensed Matter
UR - http://dx.doi.org/10.1103/PhysRevB.93.245106
UR - http://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.075101
UR - http://hdl.handle.net/10044/1/34722
VL - 93
ER -