Kiel Nano, Surface and Interface Science (KiNSIS)

Kolloquiumsvortrag: Ultrafast dynamics of exciton formation at the ZnO (10-10) surface

27.05.2014 von 17:00 bis 18:30

Kiel, Leibnizstraße 13, Hans-Geiger-Hörsaal

Dr. Julia Stähler
(Fritz Haber Institute of the Max Planck Society)


Ultrafast dynamics of exciton formation at the ZnO(10-10) surface
We study the ultrafast quasiparticle dynamics in and below the ZnO conduction band using femtosecond time-resolved two-photon photoelect-ron spectroscopy. Above band gap excitation (hpump = 4.19 eV) enables the investigation of the hot electron relaxation by electron-phonon scatte-ring with an excess energy of 0.8 eV down to the Fermi level EF. It is shown that surface exciton (SX) formation creates additional states below EF already a few hundred femtoseconds after excitation. These quasipar-ticle formation dynamics are independent of temperature, while the decay is accelerated by heating. We furthermore tune the excitation density across the Mott limit and thereby reduce the SX formation due to transient carrier-carrier screening. Lastly, hydrogen titration proves the remarkable stability of this subsurface species. First results on energy level alignment and carrier dynamics in organic thin films on ZnO(10-10) will be dis-cussed.

http://www.physik.uni-kiel.de/physkoll/pdf/PhysKoll-2014-05-27.pdf

Diesen Termin meinem iCal-Kalender hinzufügen

zurück

Aktuelle Pressemitteilungen

Medien

Veranstaltungen

Kalender

« Juli 2017 »
Mo Di Mi Do Fr Sa So
26 27 28 29 30
  • 15:00: Sommerfest Technische Fakultät, Verleihung KiNSIS-Promotionspreis
  • Klicken Sie, um Details zu allen 1 Terminen zu sehen.
1 2
3 4
  • 16:15: Eberhard Möbius (New Hampshire): Astronomy with Neutral Atoms
  • Klicken Sie, um Details zu allen 1 Terminen zu sehen.
5 6 7
  • 14:15: Learning Sparse Binary Features for Medical Image Segmentation of the Abdomen (Heinrich, Lübeck)
  • 14:15: Approximating Geometric Knapsack via L-packings (Grandoni, Lugano)
  • Klicken Sie, um Details zu allen 2 Terminen zu sehen.
8 9
10
  • 17:15: Magnetic particel imaging (Prof. Dr. Horst Weller, Uni Hamburg)
  • Klicken Sie, um Details zu allen 1 Terminen zu sehen.
11
  • 16:15: Erwin O. Flückiger: 60 Jahre Neutronenmonitor
  • Klicken Sie, um Details zu allen 1 Terminen zu sehen.
12 13
  • 17:00: Self-Assembled Molecular Vessels (Prof. Mukherjee, India)
  • Klicken Sie, um Details zu allen 1 Terminen zu sehen.
14
  • 14:15: Prof. Victor Verdugo (Paris)
  • Klicken Sie, um Details zu allen 1 Terminen zu sehen.
15 16
17 18
  • 11:00: Generalized Convolution Quadrature (Prof. Fernández, Zürich)
  • 15:00: Abschiedskolloquium von Prof. Piel
  • Klicken Sie, um Details zu allen 2 Terminen zu sehen.
19
  • 18:00: Parlamentarischer Abend: "Nanotechnologie in Schleswig-Holstein: Wissenschaft, Wirtschaft, Zukunft" (NINa e.V.)
  • Klicken Sie, um Details zu allen 1 Terminen zu sehen.
20 21
  • 14:15: A Family of Crouzeix-Raviart Non-Conforming Finite Elements in Two- and Three Spatial Dimensions (Prof. Sauter, Zürich)
  • Klicken Sie, um Details zu allen 1 Terminen zu sehen.
22 23
24 25 26 27 28 29 30
31 1 2 3 4 5 6