Ohuchi's Group

The research will be carried out at the University of Washington in the existing laboratories of Profs. Ohuchi in 216 Roberts Hall, Wilcox Annex Laboratory, 44 Johnson Hall and shared Nanostructure Analysis Facility in B009 Physics-Astronomy Building. All three labs have molecular beam epitaxy (MBE) capability in UHV chambers connected by UHV transfer to analytical chambers, as described below. The labs also have fume hoods and student work stations.

Growth and Surface Analysis System I (216 Roberts Hall)

An ultra-high vacuum system consisting of three interconnected chambers (growth, sample prep and analysis) and a load-lock is located in 216 Roberts Hall. In the growth chamber, which is equipped with a CCD reflection high-energy electron diffraction (RHEFD) system, a heating stage, Knudsen cell evaporation sources including GaSe, As, and Se. We expect to build and install a separate Ga source as part of this proposal. In the sample preparation chamber, the sample may be heated to a high temperature. Auger electron spectroscopy (AES) and X-ray photoemission spectroscopy (XPS) are available using a cylindrical mirror analyzer in the analysis chamber.

Wilcox Annex Laboratory

Newly established laboratory dedicated for electrical transport measurements, optical reflection and transmission, photoluminescence, and other optical measurements. Tunable laser sources for photoluminescence measurement.

Raman Scattering and Photoluntnescence System (Johnson Hall)

An ISA S-3600 high resolution Raman spectrometer equipped with an INOVA-300 Ar laser is available for use. A liquid nitrogen cooled dewar may be attached for measurements below room temperature.

Nanostructure Analysis Facility (B009 Physics-Astronomy Building)

This is Omicron variable temperature, ultrahigh vacuum, scanning force and tunneling microscope, with capabilities for simultaneous growth and measurement at non-ambient temperature (30.1000K AFM; 30-1500K STM), arrived in January 2001. The system is connected by U1-!V to an analytical chamber with XPS, LEED and ion scattering spectroscopy capability and an additional sample preparation chamber.

The wide temperature range of the Microscope will let us control the relative time scales of growth and diffusion (or reaction). The low temperature capability enables freezing out dynamic processes, forming metastable structures, and obtaining site-specific spectra. The in situ sample preparation and growth ability lets us investigate these systems as they are changing form. The other characterization tools in the same UHV system enable chemical and long range order identification, and cross-referencing with research in other laboratories.

A Park Instruments ambient atmosphere AFM/STM is also available for cx situ measurements and student training in scanning probe microscopy.

The Nanostructure Analysis Facility is shared with Profs. Olmstead(physics), Fain(physics), and Campbell(chemistry), with a jointly-supported Ph.D. level staff scientist (Dr. Qiuming Yu,) supervising its use and maintenance. The instrument will be located in room PAR B009. There are fewer than five such instruments currently located (or on order) in the United States.