Everything is made of something.

The ability to design, synthesize and measure materials with picometer resolution represents an emerging, final frontier in materials science.  Whereas the past two decades have seen remarkable advances in nanoscience and engineering, in which materials are designed and engineered at the 1-100 nm length scale via the control of clusters of atoms, we are now in an era of picoscale materials development, where picometer-scale distortions, including manipulation and control of subtle bond configurations between individual atoms, strongly modify functional behavior in the solid state.  This can result in materials having properties that do not exist in nature.  Picoscience offers the ultimate length scale to engineer materials, since distortions smaller than a single picometer become too small to alter macroscopic material properties.

welcome

Welcome to Ahn Lab

The research group focuses on the fabrication and the study of the physical properties of novel complex oxide materials using advanced growth and characterization techniques, including molecular beam epitaxy and synchrotron x-ray scattering techniques.  Current interests include the physics and technology of multifunctional oxides, nanofabrication and electronic writing using scanning probe microscopies, electronic control of complex order parameters in correlated oxides, and development of nonvolatile logic switches for post-CMOS computing paradigms.

Recent Results

(Editors pick) Revealing surface-state transport in ultrathin topological crystalline insulator SnTe films

2019
Ke Zou, Stephen D. Albright, Omur E. Dagdeviren, M. D. Morales-Acosta, Georg H. Simon, Chao Zhou, Subhasish Mandal, Sohrab Ismail-Beigi, Udo D. Schwarz, Eric I. Altman,...

Integration of sputter-deposited multiferroic CoFe2O4-BiFeO3 nanocomposites on conductive La0.7Sr0.3MnO3 electrodes.

2019
Seung Han Lee, Guo Tian, Tae Cheol KIm, Hyun Kyu Jung, Jun Woo Choi, Frederick J Walker, Charles H Ahn, Caroline A Ross, and Dong Hun Kim, Integration of sputter-deposited...

Structural distortions at polar manganite interfaces

2017
Recent paper: S. Koohfar, A. S. Disa, M. S. J. Marshall, F. J. Walker, C. H. Ahn, and D. P. Kumah, Structural distortions at polar manganite interfaces. Physical Review...

Control of hidden ground-state order in NdNiO3 superlattices

2017
Recent paper: A. Disa, A. Georgescu, J. Hart, D. Kumah, P. Shafer, E. Arenholz, D. Arena, S. Ismail-Beigi, M. Taheri, F. Walker, and C. Ahn, Control of hidden ground-state...

Solar hydrogen production using epitaxial SrTiO3 on a GaAs photovoltaic

2017
Recent paper: Solar hydrogen production using epitaxial SrTiO3 on a GaAs photovoltaic. Energy and Environmental Science., 10, 317, 2017.