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 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.

News & Recent Results

New publication: Resonant x-ray scattering method for measuring cation stoichiometry in BaSnO3 thin films

On January 2022, Claudia Lau, Nicholas G. Combs, Evguenia Karapetrova,  Juan Jiang,  Susanne Stemmer,  Charles H. Ahn, and Frederick J. Walker published “Resonant x-ray...

Research Highlight: Iron selenide film reveals clues about superconductivity

Yale School of Engineering & Applied Science highlighted synchrotron-based photon emission spectroscopy work done by the Ahn group. See ”Probing Thin-Film...

Guillaume Marcaud accepts the quantum scientist position at Amazon

Congratulations to Guillaume Marcaud on his new position as a quantum scientist at Amazon! Dr. Marcaud became a postdoctoral research fellow in the Ahn Lab after receiving...

New Findings: Weak antilocalization in topological crystalline insulator SnTe films deposited using amorphous seeding on SrTiO3

On November 09, 2021, Stephen D. Albright, Ke Zou, Frederick J. Walker, and Charles H.

Research Highlight: Probing Thin-Film Superconductivity at the Picoscale

The Advanced Photon Source at Argonne National Laboratory highlighted synchrotron x-ray diffraction work done by the Ahn group. See ”Probing Thin-Film Superconductivity at...

Ankit Disa accepts professorship at Cornell University

Ahn Lab Ph.D. Alumni Ankit S. Disa has accepted a professorship at Cornell University, USA. Dr. Disa has been an Alexander von Humboldt postdoctoral research fellow, at the...

New Findings: Identifying crystal structures and chemical reactions at the interface of stanene on Bi2Te3

On October 22, 2020, Stephen D. Albright, Ke Zou, Claudia Lau, Stephen Eltinge, Hawoong Hong, Sohrab Ismail-Beigi, Frederick J. Walker and Charles H. Ahn published “...

New Findings: A comprehensive ARPES study on the type-II Dirac semimetal candidate Ir1−xPtxTe2

On June 8, 2020, Juan Jiang, Sangjae Lee, Fucong Fei, Fengqi Song, Elio Vescovo, Konstantine Kaznatcheev, Fred J. Walker, and Charles H. Ahn published “A comprehensive ARPES...

Stephen D. Albright defends thesis: "Ultra-thin Film Growth of Chalcogenides to Realize Novel Electronic Phenomena"

On September 17, 2020, Stephen D. Albright successfully defended his thesis, “Ultra-thin Film Growth of Chalcogenides to Realize Novel Electronic Phenomena.”

Yichen Jia defends thesis: "Spin-Dependent Quantum Transport in Epitaxial BaTiO3-Germanium Tunnel Junctions"

On July 20, 2020, Yichen (Eddie) Jia successfully defended his thesis, “Spin-Dependent Quantum Transport in Epitaxial BaTiO3-Germanium Tunnel Junctions.”

New Findings: Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO3

On April 8, 2020, Rui Peng, Ke Zou, M. G. Han, Stephen D. Albright, Hawoong Hong, Claudia Lau, H. C. Xu, Yimei Zhu, Fred J. Walker, and Charles H. Ahn published “Picoscale...

Charles Ahn named Materials Research Society Fellow

Charles Ahn, principle investigator of the Ahn Lab and the John C. Malone Professor of Applied Physics, Mechanical Engineering & Materials Science and Physics, has been...

Claudia Lau defends thesis: "Structural characterization of epitaxial oxide heterostructures via X-ray scattering"

On March 10, 2020, Claudia Lau successfully defended her thesis: “Structural characterization of epitaxial oxide heterostructures via X-ray scattering.”