TeraDynamics Group
Phenomena that are driven by changes in the electronic states often involve dynamics over several orders of magnitude in time. The key to understand such processes is to use experimental schemes that can provide sufficient information to decipher the evolution of electronic and atomic structures. We use THz time domain spectroscopy for investigating time-resolved phenomena in varieties of ''quantum matter'' across condensed matter systems. Several variations of this technique are employed in our lab: (i) 2D THz spectroscopy, (ii) Optical pump-THz/optical probe spectroscopy.
These unique combinations of complementary methods allows us for investigating a broad range of phenomena surrounding the correlation dynamics:
Quantum criticality in heavy-fermion systems.
Phase transitions in correlated materials.
Ultrafast magnetization dynamics.
Optical characterization of materials.
The Team
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Prof. Dr. Shovon Pal (Adjunct advisor). Currently at NISER, India -
Marvin Mueller (PhD Student) -
Jingwen Li (PhD Student) -
Debankit Priyadarshi (PhD student)
Publications
14. Critical slowing down near a magnetic quantum phase transition with fermionic breakdown, Chia-Jung Yang, Kristin Kliemt, Cornelius Krellner, Johann Kroha, Manfred Fiebig, and Shovon Pal, external pageNature Physics (2023).
13. Terahertz control of many-body dynamics in quantum materials, Chia-Jung Yang, Jingwen Li, Manfred Fiebig, and Shovon Pal, external pageNature Reviews Materials (2023).
12. A perspective on nonlinearities in coherent magnetization dynamics, Jingwen Li, Chia-Jung Yang, Ritwik Mondal, Christian Tzschaschel and Shovon Pal, external pageApplied Physics Letters 120, 050501 (2022).
11. Birefringence of orthorhombic DyScO3: Toward a terahertz quarter-wave plate, Chia-Jung Yang, Jingwen Li, Jannis Lehmann, Nives Strkalj, Morgan Trassin, Manfred Fiebig, and Shovon Pal, external pageApplied Physics Letters 118, 223506 (2021).
10. Origin of Terahertz Soft-Mode Nonlinearities in Ferroelectric Perovskites, Shovon Pal, Nives Strkalj, Chia-Jung Yang, Mads C. Weber, Morgan Trassin, Michael Woerner, and Manfred Fiebig, external pagePhysical Review X 11, 021023 (2021).
9. Two-dimensional spectroscopy on a THz quantum cascade structure, Sergej Markmann, Martin Frankié, Shovon Pal, David Stark, Mattias Beck, Manfred Fiebig, Giacomo Scalari, and Jérôme Faist, external pageNanophotonics 10, 171 (2021).
8. Terahertz Conductivity of Heavy-fermion Systems from Time-resolved Spectroscopy, Chia-Jung Yang, Shovon Pal, Farzaneh Zamani, Kristin Kliemt, Cornelius Krellner, Oliver Stockert, Hilbert v Löhneysen, Johann Kroha, and Manfred Fiebig, external pagePhysical Review Research 2, 033296 (2020).
7. Efficient spin excitation via ultrafast damping-like torques in antiferromagnets, Christian Tzschaschel, Takuya Satoh, and Manfred Fiebig, external pageNature Communications 11, 6142 (2020).
6. Depolarizing-Field Effects in Epitaxial Capacitor Heterostructures, Nives Strkalj, Gabriele De Luca, Marco Campanini, Shovon Pal, Jakob Schaab, Chiara Gattinoni, Nicola A. Spaldin, Marta D. Rossell, Manfred Fiebig, and Morgan Trassin, external pagePhysical Review Letters 123, 147601 (2019).
5. Tracking the ultrafast motion of an antiferromagnetic order parameter, Christian Tzschaschel, Takuya Satoh, and Manfred Fiebig, external pageNature Communications 10, 3995 (2019).
4. Fermi Volume Evolution and Crystal-Field Excitations in Heavy-Fermion Compounds Probed by Time-Domain Terahertz Spectroscopy, Shovon Pal, Christoph Wetli, Farzaneh Zamani, Oliver Stockert, Hilbert v. Loehneysen, Manfred Fiebig, and Johann Kroha, external pagePhysical Review Letters 122, 096401 (2019).
3. Time-resolved collapse and revival of the Kondo state near a quantum phase transition, Christoph Wetli, Shovon Pal, Johann Kroha, Kristin Kliemt, Cornelius Krellner, Oliver Stockert, Hilbert v. Loehneysen, and Manfred Fiebig, external pageNature Physics 14, 1103 (2018).
2. Ultrafast optical excitation of coherent magnons in antiferromagnetic NiO, Christian Tzschaschel, Kensuke Otani, Ryugo Iida, Tsutomu Shimura, Hiroaki Ueda, Stefan Günther, Manfred Fiebig, and Takuya Satoh, external pagePhysical Review B 95, 174407 (2017).
1. Two-dimensional coherent spectroscopy of a THz quantum cascade laser: observation of multiple harmonics, Sergej Markmann, Hanond Nong, Shovon Pal, Tobias Fobbe, Negar Hekmat, Reshma A. Mohandas, Paul Dean, Lianhe Li, Edmund H. Linfield, A. Giles Davies, Andreas D. Wieck, and Nathan Jukam, external pageOptics Express 25, 21753 (2017).