BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:iCalendar-Ruby
BEGIN:VEVENT
CATEGORIES:Seminar
DESCRIPTION:Condensed Matter Theory:\n\n"Sticking coefficent for atoms inci
dent upon metals within the exact factorization" \n\n \n\nDr. Celso Ricardo
Caldeira Rego \n\nMax Planck Institute of Microstructure Physics\, Halle G
ermany \n\n \n\nThe complete understanding of dynamical processes arising w
hen an atom approaches a metallic surface is a challenge at the core of Qua
ntum Mechanics. To date\, the most common approach to tackle this problem i
s the Born Oppenheimer approximation\, which is\, nonetheless inapplicable
when one considers non-adiabatic contributions resulting from the rapid nuc
lear motion under image-charge (IC) potentials. Here\, we propose to rely o
n the Exact Factorization formalism to investigate the role of non-adiabati
c electron-hole excitations in dynamical quantum processes. We consider the
Anderson-Newns Hamiltonian to model the collision of a hydrogen atom with
metal and study the sticking coefficient as a function of incident energy.
In our model\, the metal occupies the half-space z<0\, and the adatom impin
ges upon it along the z-axis. We observe that the IC potential roughly spli
ts the z>0 into two regions. For z>zB\, where Bz is a distance of a few Boh
r radii\, the adatom is neutral and the PES upon which the nucleus moves ar
e flat. For z