Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session E20: First-principles Modeling of Excited-state Phenomena in Materials IV: Time-dependent Density Functional Theory
8:00 AM–11:00 AM,
Tuesday, March 5, 2019
BCEC
Room: 157A
Sponsoring
Units:
DCOMP DMP
Chair: Sahar Sharifzadeh, Boston University
Abstract: E20.00004 : Floquet theory for the electronic stopping of projectiles in solids*
9:00 AM–9:12 AM
Presenter:
Nicolo' Forcellini
(Physics, University of Cambridge)
Authors:
Nicolo' Forcellini
(Physics, University of Cambridge)
Emilio Artacho
(Physics, University of Cambridge)
We propose here a general (single-particle) stationary theory for the electronic excitation in crystalline solids by a constant-velocity projectile. It is based on the Floquet formalism for time-periodic systems[3], exploiting the system discrete translational space-time invariance. A change to the projectile’s reference frame allows for a generalization of the treatment in Ref. [2], permitting a full study of the stopping in strong coupling for any crystalline system. Non-trivial effects such as the low-velocity threshold effect can be analyzed and understood in this framework.
[1]TJ Lindhard et al.Selsk. Mat. Fys. Medd. 34 No. 4 (1964).
[2]P.M. Echenique et al., Phys. Rev. A 33, 897 (1986).
[3]J.H. Shirley, Phys. Rev. 138.4B, B979 (1965).
*This work was supported by the EPSRC training grant EP/N509620/1 (NF) and the Leverhulme Trust Research Project Grant RPG-2018-254 (EA).
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