Optical spectroscopy

Our research interests are devoted to optical and magneto-optical properties of novel strongly correlated electron systems exhibiting unconventional electronic transport and magnetic phenomena. We use wide-band, from sub-mm to deep ultraviolet, spectroscopic tools such as ellipsometry, reflectance and transmittance measurements to explore the interplay between charge, orbital and spin degrees of freedom in transition metal oxides and the mechanism of high-temperature superconductivity in ferropnictides and cuprates. Recently our research has been focused on the interface induced optical anomalies and unusual physics occurs in oxide-based artificially fabricated nanostructures.

Recent Publications Nanoscale layering of antiferromagnetic and superconducting phases in Rb2Fe4Se5 A. Charnukha, A. Cvitkovic, T. Prokscha, D. Pröpper, N. Ocelic, A. Suter, Z. Salman, E. Morenzoni, J. Deisenhofer, V. Tsurkan, A. Loidl, B. Keimer, A. V. Boris. Phys. Rev. Lett. 109 (2012), 017003 Anisotropic optical response of the mixed-valent Mott-Hubbard insulator NaCu2O2 Y. Matiks, A. N. Yaresko, K. Myung-Whun, A. Maljuk, P. Horsch, B. Keimer, A. V. Boris. Phys. Rev. B 84 (2011), 245116 Eliashberg approach to infrared anomalies induced by the superconducting state of Ba0.68K0.32Fe2As2 single crystals A. Charnukha, O. V. Dolgov, A. A. Golubov, Y. Matiks, D. L. Sun, C. T. Lin, B. Keimer, A. V. Boris. Phys. Rev. B 84 (2011), 174511 Far-infrared and dc magnetotransport of CaMnO3–CaRuO3 superlattices P. Yordanov, A. V. Boris, J. W. Freeland, J. J. Kavich, J. Chakhalian, H. N. Lee, B. Keimer. Phys. Rev. B 84 (2011), 045108 Dimensionality Control of Electronic Phase Transitions in Nickel-Oxide Superlattices A. V. Boris, Y. Matiks, E. Benckiser, A. Frano, P. Popovich, V. Hinkov, P. Wochner, M. Castro-Colin, E. Detemple, V. K. Malik, C. Bernhard, T. Prokscha, A. Suter, Z. Salman, E. Morenzoni, G. Cristiani, H.-U. Habermeier, B. Keimer. Science 332 (2011), 937−940 Supporting Online Material Superconductivity-induced optical anomaly in an iron arsenide A. Charnukha, P. Popovich, Y. Matiks, D. L. Sun, C. T. Lin, A. N. Yaresko, B. Keimer, A. V. Boris. Nature Communications 2 (2011), 219 Supplementary information Specific heat measurements of Ba0.68K0.32Fe2As2single crystals: Evidence for a multiband strong-coupling superconducting state P. Popovich, A. V. Boris, O. V. Dolgov, A. A. Golubov, D. L. Sun, C. T. Lin, R. K. Kremer, B. Keimer. Phys. Rev. Lett. 105 (2010), 027003 Exciton Doublet in the Mott-Hubbard Insulator LiCuVO4 Identified by Spectral Ellipsometry Y. Matiks, P. Horsch, R. K. Kremer, B. Keimer, A. V. Boris. Phys. Rev. Lett. 103 (2009), 187401 Full list of publications...