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Byoung Y Choi

Atomic scale imaging, manipulation, and spectroscopy Mechanical and electrical properties of molecules in self-assembled films Ambient pressure photoelectron spectroscopy for environnemental sciences Studies of friction, adhesion, and wear at the nanometer scale Electronic, mechanical, and chemical properties of nanoclusters Structure of thin liquid films and wetting Nanoscale material imaging and manipulation (Molecular Foundry) Catalytic and chemical properties of surfaces

Updated by Franck, May 24 2007

Byoung Y Choi
Postdoctoral Fellow

Materials Sciences Division
Mail stop 66R0200-8256 (Office 66-201)
Lawrence Berkeley National Laboratory
1 Cyclotron Road, Berkeley, California 94720 USA

Phone: +1-510-486-7478
FAX: +1-510-486-6044
Email: bychoi*lbl.gov (replace * by @)

Project

As a postdoctoral fellow in Dr. Miquel Salmeron's group in Material Science Division of LBNL, my research topic is the study of the interaction forces between atomically sharp tips and single atoms and molecules adsorbed on a surface. For this study I use non-contact atomic force microscopy (NC-AFM) at low temperature (4 K). The interaction forces originate from attractive and repulsive interactions between the tip atoms and the surface-bound molecules. Attractive forces are due to weak van der Waals, stronger H-bonds, electrostatic and covalent bond formation. The NC-AFM will also allow me to image surfaces, both metallic and insulating with atomic resolution. In addition to imaging single molecules I will perform studies of mechanical manipulation of those molecules and investigate their electronic properties. The low temperature NC-AFM is currently being constructed and close to its final stage.

Education
Ph. D. in Physics, Seoul National University, Seoul, Korea, (Feb. 2006)
M. S. in Physics, Seoul National University, Seoul, Korea, (Feb. 2000)
B. S. in Physics, POSTECH, Pohang, Korea, (Aug. 1997)

Professional Experience
Graduate Researcher, Dept. of Physics, POSTECH, Korea (Sep. 1997 ~ Feb. 1998)
Teaching Assistant, Dept. of Physics, Seoul National University, Korea (Sep. 1998 ~ Feb. 2002)
Researcher, Center for Science in Nanometer Scale, Seoul National University, Korea (Mar. 2002 ~ May. 2006)
Postdoctoral Researcher, Material Science Division, Lawrence Berkeley National Laboratory, USA (Jun. 2006 ~ Present)

Honors
The Graduate Student Research Award, Dept. of Physics, Seoul Nat'l University (Feb. 2006)

Selected Publications

B.-Y. Choi, S.-J. Kahng, S. Kim, H. Kim, H.W. Kim, Y.-J. Song, J. Ihm, and Y. Kuk,
Conformational Molecular Switch of the Azobenzene Molecule : A Scanning Tunneling Microscopy Study, Phys. Rev. Lett. 96 156106 (2006)
DOI : 10.1103/PhysRevLett.96.156106

S. Lee, G. Kim, H. Kim, B.-Y. Choi, J. Lee, B.W. Jeong, J. Ihm, Y. Kuk, and S.-J. Kahng,
Paired Gab States in a Semiconducting Carbon Nanotube: Deep and Shallow Levels, Phys. Rev. Lett. 95 166402 (2005)
DOI : 10.1103/PhysRevLett.95.166402

T.-H. Kim, B.-Y. Choi, Y. J. Song, W. G. Park, S.-J. Kahng, and Y. Kuk,
Transition between two competing structures in the epitaxial Ag layer on W(110), Phys. Rev. B 67 233401 (2003)
DOI : 10.1103/PhysRevB.67.233401

S.-J. Kahng, B.-Y. Choi, Y. Kuk,
Sputter-erosion dynamics of Ni(110) surface, Appl. Surf. Sci. 183 76 (2001)
DOI : 10.1016/S0169-4332(01)00555-4

Research Interests

Atom-Resolved Imaging and Manipulation with STM and NC-AFM
Induced Chemical Reaction of Organic Molecules on Various Surfaces
Photon or Plasmon Related Molecular Dynamics on Metallic Surface
in-situ Growth and Investigation of Nanostructure or Single Atomic Film