Synchrotron-radiation angle-resolved photoelectron spectroscopy has been utilized to examine the bulk valence-band structure of anatase TiO2(001) thin films fabricated on LaAlO3(100) by pulsed laser deposition. The energy-momentum dispersion relat...
The initial growth of a Ag three-dimensional island on an atomically resolved Si(001) substrate was investigated in situ by scanning tunneling microscopy (STM) at room temperature. It took similar to 20 min for the island to grow from nucleation t...
Shota Tsuchida   Kazuhiro Ema   Hiroshi Sakama   Hideyuki Kunugita   
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011 2011年 [査読有り]
Anatase TiO2 is well known to exhibit high photocatalytic activity. It is believed that photo-excited carriers create activated species by reacting with water and oxygen at the crystal surface, and such activated species decompose organic pollutan...
Taki Hashimoto   Keisuke Takahashi   Hideyuki Kunugita   Hiroshi Sakama   Kazuhiro Ema   
16TH INTERNATIONAL CONFERENCE ON ELECTRON DYNAMICS IN SEMICONDUCTORS, OPTOELECTRONICS AND NANOSTRUCTURES (EDISON 16) 193(1) 012051-012054 2009年 [査読有り]
We measured transient absorption spectra with pump-probe technique to investigate the dynamics of photo-excited carriers at 300 K and 12 K in anatase TiO(2) epitaxial film. Although the photoluminescence (PL) originated from self-trapped excitons ...