Natural linewidth analysis of d-band photoemission from Ag(110)

A. Gerlach; K. Berge; T. Michalke; A. Goldmann; C. Janowitz; R. Mueller

doi:10.1016/S0039-6028(01)01661-2

paper

Natural linewidth analysis of d-band photoemission from Ag(110)

arXiv:cond-mat/0010057 · doi:10.1016/S0039-6028(01)01661-2

Abstract

We report a high-resolution angle-resolved study of photoemission linewidths observed for Ag(110). A careful data analysis yields k $- r eso l v e d u pp er l imi t s f or t h e in v er se in e l a s t i c l i f e t im eso f$ d $- h o l es a tt h e X - p o in t o f t h e b u l k ban d s t r u c t u r e . A tt h e u pp er$ d $- ban d e d g e t h e h o l e - l i f e t im e i s$ Ï_h \geq 22 $f s, i . e . m or e t han o n eor d er o f ma g ni t u d e l a r g er t han p r e d i c t e df or a f r ee - e l ec t r o n g a s . F o l l o w in g c a l c u l a t i o n s f or$ d $- h o l e d y nami cs in C u (I . C am p i l l oe t a l ., P h y s . R e v . L e tt ., in p r ess) w e in t er p r e tt h e l i f e t im ee nhan ce m e n t b y a s ma l l sc a tt er in g cr oss - sec t i o n o f$ d $- an d$ sp $- s t a t es b e l o w t h e F er mi l e v e l . W i t hin cr e a s in g d i s t an ce t o$ E_F $t h e$ d $- h o l e l i f e t im es g e t s h or t er b ec a u seo f t h er a p i d l y in cr e a s in g d e n s i t y o f d - s t a t es an d co n t r ib u t i o n so f in t r a -$ d$-band scattering processes, but remain clearly above free-electron-model predictions.

14 pages, 7 figures