Dr. Jannis Lehmann

Research interests

• Light-matter interaction
• Charge, spin, and orbital order in solids
• Equipment development
• Optics, electronics, acoustics

University career

Since Oct. 2023: Laser technician at FastLab, Department of Physics, ETH Zurich, Switzerland. Duties: Design, construction and maintenance of ultrafast laser systems.

2022 – 2023: Postdoctoral researcher at the Emergent Photodynamics Research Laboratory, RIKEN Center for Emergent Matter Science, Japan. Topic: Nonlinear- and magneto-optical imaging and spectroscopy on magnetoelectric quantum materials.

2020 – 2022: Postdoctoral researcher within the POLARIS ERC project. Topic: Optical in-situ monitoring of polarization emergence during thin-film growth.

2015 – 2020: Doctoral student, Department of Materials, ETH Zurich, Switzerland. Thesis: Toroidal order in magnetic metamaterials, supervised by Prof. Dr. M. Fiebig.

2012 – 2014: M.Sc. in physics, University of Hamburg and University of Freiburg, Germany. Thesis: BaMgF₄ als nichtlinear optisches Ferroelektrikum für Flüstergaleriesonatoren, supervised by Prof. Dr. K. Buse and Prof. Dr. G. Huber.

2008 – 2011: B.Sc. in physics, University of Hamburg, Germany. Thesis: Resonatorinterne Frequenzverdopplung und Verstärkungsmodulation eines Pr³⁺:LiYF₄-Lasers bei 546 nm, supervised by Prof. Dr. G. Huber.

Publications in peer-reviewed journals

Electric-field-enhanced second-harmonic domain contrast and nonreciprocity in a van der Waals antiferromagnet, Z. Wang, M. Wang, J. Lehmann, Y. Shiomi, T.-h. Arima, N. Nagaosa, Y. Tokura, and N. Ogawa; Nature Communications 15, 7542 (2024).

Odd-parity multipole order in the spin-orbit coupled metallic pyrochlore Pb₂Re₂O_7-δ, Y. Nakayama, D. Hirai, H. Sagayama, K. Kojima, N. Katayama, J. Lehmann, Z. Wang, N. Ogawa, and K. Takenaka; Phys. Rev. Materials 8, 055001 (2024).

Reversible optical control of polarization in epitaxial ferroelectric thin films, M. F. Sarott, M. J. Müller, J. Lehmann, B. J. Burgat. M. Fiebig, and M. Trassin; Advanced Materials 36, 2312437 (2024).

Long-range order in arrays of composite and monolithic magnetotoroidal moments, J. Lehmann, N. Leo, L. J. Heyderman, and M. Fiebig; Phys. Rev. B 108, 104405 (2023).

Birefringence of orthorhombic DyScO₃: Toward a terahertz quarter-wave plate, C.-J. Yang, J. Li, J. Lehmann, N. Strkalj, M. Trassin, M. Fiebig, and S. Pal; Appl. Phys. Lett. 118, 223506 (2021).

Relation between microscopic interactions and macroscopic properties in ferroics, J. Lehmann, A. Bortis, P. M. Derlet, C. Donnelly, N. Leo, L. J. Heyderman, and M. Fiebig; Nature Nanotechnology 15, 896 (2020).

Reverse and forward engineering of Drosophila corneal nanocoatings, M. Kryuchkov, O. Bilousov, J. Lehmann, M. Fiebig, and V. L. Katanaev; Nature 585, 383 (2020).

Role of the ferroelastic strain in the optical absorption of BiVO₄, C. Hill, M. C. Weber, J. Lehmann, T. Leinen, M. Fiebig, J. Kreisel, and M. Guennou; APL Materials 8, 081108 (2020).

Microdisplays as a versatile tool for the optical simulation of crystal diffraction in the classroom, J. Lehmann, C. Tzschaschel, M. Fiebig, and Th. Weber; Journal of Applied Crystallography 52, 457 (2019).

Poling of an artificial magneto-toroidal crystal, J. Lehmann, C. Donnelly, P. M. Derlet, L. J. Heyderman, and M. Fiebig; Nature Nanotechnology 14, 141 (2019).

Alternative moth-eye nanostructures: antireflective properties and composition of dimpled corneal nanocoatings in silk-moth ancestors, M. Kryuchkov, J. Lehmann, J. Schaab, V. Cherepanov, A. Blagodatski, M. Fiebig, and V. L. Katanaev; Journal of Nanobiotechnology 15, 61 (2017).

Antireflective nanocoatings for UV-sensation: the case of predatory owlfly insects, M. Kryuchkov, J. Lehmann, J. Schaab, M. Fiebig, and V. L. Katanaev; Journal of Nanobiotechnology 15, 52 (2017).