Han Htoon

Professional Career

• 2005- Present: Technical Staff Member, Los Alamos National Laboratory
• 2002 - 2005, Postdoctoral Fellow, Los Alamos National Laboratory

Education

• 2001: Ph.D. Physics, The University of Texas at Austin
• 1996: M. S. Physics, Western Illinois University, Macomb, IL
• 1991: B.Sc. Phys. (Honors), University of Yangon, Myanmar
   

Awards 2005 Postdoctoral Distinguish Performance Award, Los Alamos National Laboratory 2003 Achievement Award, Los Alamos National Laboratory 2001 Postdoctoral Fellows, Los Alamos National Laboratory 1999 Best Poster Award, Material Research Society, Fall Meeting 1996 Best Graduate Student Award, Dept. of Phys., WIU Contact Information MS-J585, C-PCS Los Alamos National Laboratory Los Alamos, NM 87545 Phone: (Office)  (505) 667-9777 (C-PCS)  & (505) 665-5444 (CINT) (Lab) (505) 665-0853 (C-PCS) & (505) 665-9649 (CINT) Fax: (505) 667-7289 e-mail: htoon@lanl.gov

Current Research

My primary research interest is in the area of optical characterization of semiconductor nanostructures including quantum dots, colloidal nanocrystals, nanowires and carbon nanotubes. The objectives of my current research projects span from the understanding of fundamental phenomena to the applications of these phenomena in novel optoelectronic devices. I conduct low temperature, high spatial as well as temporal resolution optical imaging and spectroscopy studies of individual nanoscale objects to probe their intrinsic properties.  I also utilize the femtosecond transient absorption technique to understand ultrafast carrier dynamics and energy transfer processes.   

 Some of my recent research accomplishments are:

• Magneto PL study of individual CdSe NCs that reveals different spin states of band-edge excitons.
• The first low temperature photoluminescence (PL) studies of individual single walled carbon nanotubes and observation of Fermi-edge singularity
• The first low temperature, single nanotube PL excitation studies revealing surprisingly dominant roles of phonons-assisted processes in optical absorption.
• Development of a novel, single NC PL excitation (PLE) spectroscopy technique that could account for the PL intermittency behaviors of single NCs and acquisition of the first low T PLE spectra of individual CdSe NCs.
Discovery of exciton-exciton annihilation process in CdSe nano-rods and use of this effect to improve optical gain performance of proto-type nanorod lasers
• Direct observation of exciton Rabi oscillation in InGaAs self assembled quantum dots.

I am one of the lead scientists for the Nano-opitc laboratory of the DoE Center Integrated Nanotechnology (CINT)jointly operated by LANL and Sandia National Laboratories.  Our nano-optic laboratory houses one of a kind low temperature, scanning probe (AFM/NSOM) facility and state of the art photo-detectors, lasers and other advanced spectroscopy instrumentations.

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