Naslov
Time- and angle-resolved 2PPE studies of Pb nanowires on Si(557)

Autori
Sayed, Abdul Samad ; Mikšić Trontl, Vesna ; Ligges, Manuel ; Sandhofer, Mathias ; Agarwal, Ishita ; Avigo, Isabella ; Lückermann, Daniel ; Tegenkamp, Christoph ; Pfnür, Herbert ; Bovensiepen, Uwe

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
Verhandlungen der Deutschen Physikalischen Gesellschaft. 2014

Mjesto i datum
Dresden, Njemačka, 30.03.2014. - 04.04.2014

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
2PPE study

Sažetak
Strongly anisotropic systems, like, e.g., metallic nanowire arrays grown on semiconducting surfaces, are expected to exhibit significantly different electronic dispersion - along and perpendicular to the wire structure. Angle-resolved photoemission is an excellent tool to study electronic band dispersion, but is often limited to (i) one momentum direction in a single measurement and (ii) the occupied electronic structure. Here, we report on femtosecond-laser based two-photon photoemission experiments on Pb/Si(557) nanowires that map the unoccupied electronic structure. Using a position-sensitive time-of flight spectrometer, the dispersion along and perpendicular to the wires can be analyzed simultaneously in a single measurement. Furthermore, by delaying two light pulses with respect to each other, the lifetimes of these unoccupied electronic states can be measured in a pump-probe experiment. We present first time- and momentum-resolved studies on the unoccupied states in this system. We gratefully acknowledge funding by the DFG through FOR1700.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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