Kenjiro K. Gomes
Freimann Assistant Professor of Physics
University of Illinois at Urbana-Champaign – Ph.D., 2008
Pontifícia Universidade Católica do Rio de Janeiro – M.S., 2002
Pontifícia Universidade Católica do Rio de Janeiro – B.S., 2001
Office phone: (574) 631-7134
Office: 315 Nieuwland Science Hall
Gomes Laboratory Web Site: http://www3.nd.edu/~gomeslab/
The goal of my research project is to use scanning tunneling microscope (STM) and atomic manipulation to assemble—one atom at a time—artificially engineered electronic systems. STM is the gold standard to measure electronic states with real-space atomic resolution. Atomic manipulation provides tuning capabilities that allows tailoring material properties at the electronic level, and offers a new level of control that could pave the way to uncover the physics of new emergent states and create new nanoscale devices for energy and information technologies.
Using a atomically sharp tip we are able to move individual atoms or molecules deposited at the surface of metals and semiconductors. By moving one CO molecule at a time, I assembled an artificial lattice on Cu (111) to synthesize Dirac fermion carriers, equivalent to the ones found in graphene. The periodic potential generated by the arranged molecules reshapes the band structure of a two-dimensional surface state into Dirac fermions. I applied this principle to explore unique nanoscale systems, such as an atomically sharp p-n-p junction. We also performed topological changes to add mass to the Dirac fermions and generate quantum Hall states without a magnetic field.
“Designer Dirac Fermions and Topological Phases in Molecular Graphene” Gomes K. K., Mar W., Ko W., Guinea F., Manoharan H. Nature 483, 306 (2012).
“Visualizing pair formation on the atomic scale in the high-Tc superconductor Bi2Sr2CaCu2O8+δ” Gomes K. K., Pasupathy A. N., Pushp A., Ono S., Ando Y. & Yazdani A. Nature 447, 569 (2007).