laser spectroscopy; magnetism; phase transitions; ultrafast processes; nonlinear optics; strong electronic correlations; superconductivity; quantum-critical point; EuO; CeCu(1-x)Au(x); light-matter interaction
Wetli C., Pal S., Kroha J., Kliemt K., Krellner C., Stockert O., von Loehneysen H., Fiebig M. (2018), Time-resolved collapse and revival of the Kondo state near a quantum phase transition, in NATURE PHYSICS
, 14(11), 1103-1103.
Nemec P., Fiebig M., Kampfrath T., Kimel A. V. (2018), Antiferromagnetic opto-spintronics, in NATURE PHYSICS
, 14(3), 229-241.
Shimamoto Kenta, Mukherjee Saumya, Manz Sebastian, White Jonathan, Trassin Morgan, Kenzelmann Michel, Chapon Laurent, Lippert Thomas, Fiebig Manfred, Schneider Christof, Niedermayer Christof (2017), Tuning the multiferroic mechanisms of TbMnO3 by epitaxial strain, in Scientific Reports
, 7, 44753.
Tzschaschel Christian, Otani Kensuke, Iida Ryugo, Shimura Tsutomu, Ueda Hiroaki, Günther Stefan, Fiebig Manfred, Satoh Takuya (2017), Ultrafast optical excitation of coherent magnons in antiferromagnetic NiO, in PHYSICAL REVIEW B
, 95, 174407.
Manz Sebastian, Matsubara Masakazu, Lottermoser Thomas, Büchi Jonathan, Iyama Ayato, Kimura Tsuyoshi, Meier Dennis, Fiebig Manfred (2016), Reversible optical switching of antiferromagnetism in TbMnO3, in Nature Photonics
, 10, 653.
Baierl S., Mentink J. H., Hohenleutner M., Braun L., Do T.-M., Lange C., Sell A., Fiebig M., Woltersdorf G., Kampfrath T., Huber R. (2016), Terahertz-Driven Nonlinear Spin Response of Antiferromagnetic Nickel Oxide, in Physical Review Letters
, 117, 197201.
Fiebig Manfred, Lottermoser Thomas, Meier Dennis, Trassin Morgan (2016), The evolution of multiferroics, in Nature Reviews Materials
, 1, 16046.
Huber L., Ferrer A., Kubacka T., Huber T., Dornes C., Sato T., Ogawa K., Tono K., Katayama T., Inubushi Y., Yabashi M., Tanaka Yoshikazu, Beaud P., Fiebig M., Scagnoli V., Staub U., Johnson S. L. (2015), Coherent acoustic perturbation of second-harmonic generation in NiO, in PHYSICAL REVIEW B
, 92(9), 094304.
Trassin Morgan, De Luca Gabriele, Manz Sebastian, Fiebig Manfred (2015), Probing Ferroelectric Domain Engineering in BiFeO3 Thin Films by Second Harmonic Generation, in ADVANCED MATERIALS
, 27(33), 4871-4876.
Matsubara Masakazu, Schroer Alexander, Schmehl Andreas, Melville Alexander, Becher Carsten, Trujillo-Martinez Mauricio, Schlom Darrell G., Mannhart Jochen, Kroha Johann, Fiebig Manfred (2015), Ultrafast optical tuning of ferromagnetism via the carrier density, in NATURE COMMUNICATIONS
, 6, 6724.
Leo Naemi, Meier Dennis, Becker Petra, Bohaty Ladislav, Fiebig Manfred (2015), Magnetically driven second-harmonic generation with phase matching in MnWO4, in Optics Express
, 23, 27700.
Matsubara Masakazu, Manz Sebastian, Mochizuki Masahito, Kubacka Teresa, Iyama Ayato, Aliouane Nadir, Kimura Tsuyoshi, Johnson Steven L., Meier Dennis, Fiebig Manfred (2015), Magnetoelectric domain control in multiferroic TbMnO3, in Science
, 348, 6239.
Leo Naemi, Bergman Anders, Cano Andres, Poudel Narayan, Lorenz Bernd, Fiebig Manfred, Meier Dennis (2015), Polarization control at spin-driven ferroelectric domain walls, in Nature Communications
, 6, 6661.
Matsubara Masakazu, Schroer Alexander, Schmehl Andreas, Melville Alexander, Becher Carsten, Trujillo-Martinez Mauricio, Schlom Darrell G., Mannhart Jochen, Kroha Johann, Fiebig Manfred (2015), Ultrafast Optical Tuning of Ferromagnetism via the Carrier Density, in Nature Communications
, 6, 6724.
Satoh Takuya, Iida Ryugo, Higuchi Takuya, Fiebig Manfred, Shimura Tsutomu (2015), Writing and reading of an arbitrary optical polarization state in an antiferromagnet, in Nature Photonics
, 9, 25.
Fiebig Manfred (2014), Optical Magnetization Control in EuO Films, in Ultrafast Magnetism I
, SpringerLink, Berlin.
The past two decades have witnessed a vast development of phenomena that are based on the coupling between two seemingly disjunct entities of physics: light and matter. The range of phenomena extends from the atomic scale, e.g. in the form of optically controlled Bose-Einstein condensation, to condensed-matter systems where, e.g., photoinduced insulator-metal tran-sitions have been induced. For condensed matter physicists, the advent of powerful and reliable femtosecond lasers sources has provided an excellent tool for both stimulating and probing novel types of light-matter interaction. For example, in a seminal work published in 1996, a light pulse stimulated the demagnetization of a Ni film within only one picosecond while at the same time the magnetooptical Kerr effect was used for probing this demagnetization.Presently, an important change of perspective is in sight: Instead of focusing on the dynamical aspects of a magnetization, the dynamics of systems with strongly correlated electrons in general with magnetism as only one of its many possible manifestations is moving into focus. Initial examples for such experiments are the effects of the interaction between an intense laser pulse and a Mott insulator, a superconductor, or a two-dimensional electron gas. It is the goal of this project to promote this trend and to open new realms to the field of ultrafast correlation dynamics. Two model cases are chosen for this purpose. Both involve systems and goals of great current interest. The first test compound will be EuO, a compound with exceptional magnetic properties such as semiconductivity in combination with ferromagnetism and 100% spin polarization. With our investigation we intend to achieve a stabilization of magnetic order by photodoping. The optical pulse will create carriers that will intensify the exchange interaction between the Eu(2+) ions to an extent that, ideally, an ordered magnetic state in this compound could transiently be stable even at room temperature.The second test compound will be CeCu(6-x)Au(x), a prototypical Kondo system for which unconventional quantum criticality is suspected. Here we intend to unravel the correlation physics of a Kondo-screened state near a quantum critical phase transition to a magnetically ordered state. We will achieve this by applying a radically new approach for manipulating and probing the correlations in this compound: Nonlinear optical and THz spectroscopy are introduced for probing the Fermi-liquid Kondo state, the antiferromagnetic phase and the region around the quantum critical point. Subsequently the system is excited by a strong optical pump pulse. The light-matter interaction drives the system out of equilibrium and the relaxation dynamics reveals the interactions determining the ground state properties.With our experiments we aim to provide striking demonstrations of the potential of light-matter interaction in systems with strong electronic correlations. We thus intend to accelerate the transition of the field away from ultrafast magnetization dynamics towards ultrafast correlation dynamics in general.