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Mathias Michael Schubert (born 19 October 1966) is a German physicist and Professor of Electrical and Computer Engineering at the University of Nebraska-Lincoln and member of the Nebraska Center for Materials and Nanoscience. His research concerns terahertz to deep ultraviolet spectroscopic generalized ellipsometry and imaging, the optical Hall effect, and terahertz electron paramagnetic resonance ellipsometry for characterization of semiconductors, nanomaterials, optoelectronics, organic electronics, and polymers. He was awarded the Ludwig-Genzel Prize in 2006. In 2011 he was elected Fellow of the American Physical Society. In 2014 he was named Fellow of the Leibniz Institute for Polymer Research. In 2015 he was awarded with an honorary doctorate of technology from Linkoping University. He was topical editor for the Optical Society of America from 2005-2007 and 2014-2017. He holds the John Woollam (physicist) Distinguished Professorship at the University of Nebraska-Lincoln since 2017 and a Guest Professorship from Linkoping University since 2016. He is also Associate Editor of the journal Applied Physics Letters since 2017.

Early life and education

Schubert was born in Jena, Thuringia, Germany. He graduated high school in 1986 with vocational education as tool and die maker from the Keramische Werke in Hermsdorf, Thuringia. After military service he studied physics at the University of Leipzig until 1994. He received a fellowship from the German Merit Foundation in 1995, prior to begin of his doctoral research program developing concepts of generalized ellipsometry. In 1997 after earning his PhD he moved to the University of Nebraska-Lincoln, where he worked on infrared ellipsometry developments for characterization of semiconductors, and where he invented the optical Hall effect. After return to the University of Leipzig he obtained his habilitation in 2003 in experimental physics.

Research and Career

In 2000, Schubert was appointed Assistant Professor (Habilitant, C1) at University of Leipzig, where he founded the Ellipsometry group^[1]. In 2005 Schubert was founding member of the German Association of Ellipsometry (Paul Drude e.V.).^[2] In 2005 Schubert was appointed Associate Professor at the University of Nebraska-Lincoln, where he founded the Complex Materials Optics Network^[3]. In 2012 he became Full professor. Schubert’s research focuses on broad spectral range optical characterization of organic and inorganic materials. He invented and developed spectroscopic generalized ellipsometry broadly for characterization of arbitrarily anisotropic materials including magneto-optic effect and magnetoelectric effect. He also invented the optical Hall effect for noncontact measurement of the charge carrier mass in semiconductor materials and thin film heterojunctions. The generalized ellipsometry concept permits analysis of optical properties of materials with all crystal classes, particularly with low symmetry such as orthorhombic, monoclininc, and triclinic. Such properties include phonons, excitons, polaritons, and spin magnetic moment. In 2016, Schubert developed a general concept for modeling the optical properties of low-symmetry materials, the eigendielectric polarization model. In 2022, he demonstrated measurement of the magnetic susceptibility tensor in electron paramagnetic resonance using terahertz ellipsometry.

Awards and honors

• 1995 Fellowship of the German Merit Foundation (Studienstiftung des Deutschen Volkes)
• 2002 Fellowship of the Swedish Foundation for International Cooperation in Research and Higher Education (STINT)^[4]
• 2006 Ludwig-Genzel Prize^[5]
• 2011 Elected Fellow of the American Physical Society^[6]
• 2014 Named Fellow of the Leibniz Institute for Polymer Research Dresden^[7]
• 2015 Honorary Doctor of Technology, Linköping University^[8]
• 2016 Guest professor Linkoping University^[9]
• 2017 John Woollam (physicist) Distinguished Professorship of Electrical and Computer Engineering^[10]

Selected publications

• "Polarization-dependent optical parameters of arbitrarily anisotropic homogeneous layered systems", M. Schubert, Phys. Rev. B 53, 4265-4274 (1996) [DOI]
• "Generalized far-infrared magneto-optic ellipsometry for semiconductor layer structures: Determination of free-carrier effective mass, mobility and concentration parameters in n-type GaAs", M. Schubert, T. Hofmann, and C. M. Herzinger, J. Opt. Soc. Am. A 20, 347-356 (2003) [DOI]
• "Polarization selection rules for inter-Landau level transitions in epitaxial graphene revealed by infrared optical Hall effect", P. Kühne, V. Darakchieva, J.D. Tedesco et al., Phys. Rev. Lett. 111, 077402 (2013) [DOI]
• "Coordinate-invariant Lyddane-Sachs-Teller relationship for polar vibrations in materials with monoclinic and triclinic crystal systems", M. Schubert, Phys. Rev. Lett. 117, 215502 (2016) [DOI]
• "Broadband enhanced chirality with tunable response in hybrid plasmonic helical metamaterials", U. Kilic, M. Hilfiker, A. Ruder et al., Advanced Functional Materials 31 2010329 (2021) [DOI]
• "Hyperbolic Shear Polaritons in Low-Symmetry Crystals", N. Passler, X. Ni, G. Hu et al. (2022) [[1]]

References

External links

• ORCID profile
• Scientific databases: Publons, Google Scholar