Charles Ahn

The Ahn 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.

• Fellow of the American Physical Society
• AVS Peter Mark Memorial Award
• David and Lucile Packard Fellowship in Science and Engineering
• Alfred P. Sloan Fellowship

• A. Disa, D. Kumah, A. Malashevich, H. Chen, D. Arena, E. Specht, S. Ismail-Beigi, F. J. Walker, and C. H. Ahn, Orbital engineering in symmetry-breaking polar heterostructures. Physical Review Letters, 114, 026801, 2015. DOI: 10.1103/PhysRevLett.114.026801
   
• I. Bozovic, and C. H. Ahn, A new frontier for superconductivity. Nature Physics, 10, 892, 2014. DOI: 10.1038/nphys3177
   
• M. G. Han, M. Marshall, L. Wu, M. Schofield, T. Aoki, R. Twesten, J. Hoffman, F. J. Walker, C. H. Ahn, and Y. Zhu, Interface-induced nonswitchable domains in ferroelectric thin films. Nature Communications 5, 4693. 2014. DOI: 10.1038/ncomms5693
   
• D. Kumah, A. Disa, J. Ngai, H. Chen, A. Malashevich, J. W. Reiner, S. Ismail-Beigi, F. J. Walker, and C. H. Ahn, Tuning the structure of nickelates to achieve two-dimensional electron conduction. Advanced Materials, 26, 1935, 2014. DOI: 10.1002/adma.2013042562014
   
• H. Chen, Q. Qiao, M. Marshall, A. Georgescu, A. Gulec, P. Phillips, R. Klie, F. J. Walker, C. H. Ahn, and S. Ismail-Beigi, Reversible Modulation of Orbital Occupations via an Interface-Induced Polar State in Metallic Manganites. Nano Letters, 14(9), 4965, 2014. DOI: 10.1021/nl501209p
   
• C. Xiong, W. Pernice, J. Ngai, J. W. Reiner, D. Kumah, F. J. Walker, C. H. Ahn, and H. Tang, Active silicon integrated nanophotonics: ferroelectric BaTiO3 devices. Nano Letters, 14(3), 1419, 2014. DOI: 10.1021/nl404513p 
   
• J. Ngai, F. Walker and C. Ahn, Correlated Oxide Physics and Electronics. Annual Review of Materials Research, 44, 1, 2014. DOI: 10.1146/annurev‐matsci‐070813‐113248 
   
• H. Chen, D. Kumah, A. Disa, F. J. Walker, C. H. Ahn, and S. Ismail-Beigi, Modifying the Electronic Orbitals of Nickelate Heterostructures via Structural Distortions. Physical Review Letters 110(18), 186402, 2013. DOI: 10.1103/PhysRevLett.110186402

• C.H. Ahn, Y. Bason, X. Hong, L. Klein, J.-B. Yau, "Magnetoelectronic devices based on colossal magnetoresistive thin films"
   
• A. Kolpak, F. Walker, J. Reiner, C. Ahn, S. Ismail-Beigi, “Ferroelectric devices including a layer having two or more stable configurations”