Ultrafast dynamics of (quasi-1D) Pb overlayers grown on flat and vicinal Si(111) (CROSBI ID 623808)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Syed, Abdul Samad ; Mikšić Trontl, Vesna ; Ligges, Manuel ; Sandhofer, Mathias ; Agarwal, Ishita ; Lükermann, Daniel ; Tegenkamp, Christoph ; Pfnür, Herbert ; Bovensiepen, Uwe
engleski
Ultrafast dynamics of (quasi-1D) Pb overlayers grown on flat and vicinal Si(111)
Due to real space anisotropy of the vicinal Si(111) surfaces, hot electrons can be expected to exhibit different dynamics along and perpendicular to the steps as compare to the Si(111) flat surface. We made a comparative study of Pb overlayer structures grown on vicinal Si (557) and flat Si (111) using femtosecond time- and angle- resolved two-photon photoemission. We mapped the unoccupied electronic band structure near Γ and find that both systems have two unoccupied states at E−EF=3.3 and 3.5 eV. In pump-probe experiments combined with a position sensitive electron time of flight spectrometer we analyze the ultrafast momentum dependent electron dynamics along two in plane directions. On vicinal surfaces we observe a specific, momentum dependent population dynamics which are absent on the flat surface. This signature shows a delay in population build up of 5 fs as a function of angle with respect to the terrace direction. We assign this behavior to step-induced scattering. We gratefully acknowledge funding by the DFG through FOR1700.
ultrafast dynamics
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Podaci o prilogu
2015.
objavljeno
Podaci o matičnoj publikaciji
Podaci o skupu
Verhandlungen der Deutschen Physikalischen Gesellschaft. 2015
predavanje
15.03.2015-20.03.2015
Berlin, Njemačka