Detail Time-Resolved Investigation of Coherently Controlled Electric Currents at a Metal Surface   Oleh:  Güdde, J. ; Rohleder, M. ; Meier, T. ; Koch, S.W. ; Höfer, U. Jenis: Article from Bulletin/Magazine Dalam koleksi: SCIENCE (keterangan: ada di Proquest) vol. 318 no. 5854 (Nov. 2007), page 1287. Ketersediaan Perpustakaan FK Nomor Panggil: S01.K.2007.09 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel Studies of current dynamics in solids have been hindered by insufficiently brief trigger signals and electronic detection speeds. By combining a coherent control scheme with photoelectron spectroscopy, we generated and detected lateral electron currents at a metal surface on a femtosecond time scale with a contact-free experimental setup. We used coherent optical excitation at the light frequencies a and a/2 to induce the current, whose direction was controlled by the relative phase between the phase-locked laser excitation pulses. Time- and angle-resolved photoelectron spectroscopy afforded a direct image of the momentum distribution of the excited electrons as a function of time. For the first (n = 1) image-potential state of Cu(100), we found a decay time of 10 femtoseconds, attributable to electron scattering with steps and surface defects. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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