Electronic stopping power in gold: The role of d electrons and the H/He anomaly
The electronic stopping power of H and He moving through gold is obtained to high accuracy using time-evolving density-functional theory, thereby bringing usual first-principles accuracies into this kind of strongly coupled, continuum non-adiabatic processes in condensed matter. The two key unexplai...
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| creator | M Ahsan Zeb Kohanoff, J Sanchez-Portal, D Arnau, A Juaristi, J I Artacho, Emilio |
| description | The electronic stopping power of H and He moving through gold is obtained to high accuracy using time-evolving density-functional theory, thereby bringing usual first-principles accuracies into this kind of strongly coupled, continuum non-adiabatic processes in condensed matter. The two key unexplained features of what observed experimentally have been reproduced and understood: (i) The non-linear behaviour of stopping power versus velocity is a gradual crossover as excitations tail into the d-electron spectrum; and (ii) the low-velocity H/He anomaly (the relative stopping powers are contrary to established theory) is explained by the substantial involvement of the d electrons in the screening of the projectile even at the lowest velocities where the energy loss is generated by s-like electron-hole pair formation only. |
| doi_str_mv | 10.48550/arxiv.1205.1728 |
| format | Article |
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| subjects | Condensed matter physics Crossovers Density functional theory Electrons Energy dissipation First principles Gold Holes (electron deficiencies) Physics - Materials Science Projectiles Stopping power |
| title | Electronic stopping power in gold: The role of d electrons and the H/He anomaly |
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