P207: Linear Optics (August - November 2022)
P345: Optics Lab (August - November 2022)
P456/P656: Nonlinear Optics and Lasers (January - May 2022)
P462/P657: Introduction to Quantum Optics (August - November 2021)
9. S. Pal, N. Strkalj, C.-J. Yang, M. C. Weber, M. Trassin, M. Wörner, and M. Fiebig, Origin of terahertz soft-mode nonlinearities in ferroelectric perovskites, Phys. Rev. X 11, 021023 (2021).
8. S. Markmann, M. Franckié, S. Pal, D. Stark, M. Beck, M. Fiebig, G. Scalari, and J. Faist, Two-dimensional spectroscopy on a THz quantum cascade structure, Nanophotonics 10, 171 (2021).
7. C.-J. Yang, S. Pal, F. Zamani, K. Kliemt, C. Krellner, O. Stockert, H. v. Löhneysen, J. Kroha, and M. Fiebig, Terahertz conductivity of heavy-fermion systems from time-resolved spectroscopy, Phys. Rev. Research 2, 033296 (2020).
6. N. Strkalj, G. De Luca, M. Campanini, S. Pal, J. Schaab, C. Gattinoni, N. Spaldin, M. D. Rossell, M. Fiebig, and M. Trassin, Depolarizing field effects in epitaxial capacitor heterostructures, Phys. Rev. Lett. 123, 147601 (2019).
5. S. Pal, C. Wetli, F. Zamani, O. Stockert, H. v. Löhneysen, M. Fiebig, and J. Kroha, Fermi volume evolution and crystal-field excitations in heavy-fermion compounds probed by time-domain terahertz spectroscopy, Phys. Rev. Lett. 122, 096401 (2019).
4. C. Wetli, S. Pal, J. Kroha, K. Kliemt, C. Krellner, O. Stockert, H. v. Löhneysen, and M. Fiebig, Time-resolved collapse and revival of the Kondo state near a quantum phase transition, Nature Physics 14, 1103 (2018).
3. L. Consolino, S. Jung, A. Campa, M. De Regis, S. Pal, J.-H. Kim, K. Fujita, A. Ito, M. Hitaka, S. Bartalini, P. De Natale, M. A. Belkin, and M. S. Vitiello, Spectral purity and tunability of terahertz quantum cascade laser sources based on intracavity difference-frequency generation, Science Advances 3, e1603317 (2017).
2. S. Markmann, H. Nong, S. Pal, T. Fobbe, N. Hekmat, R. A. Mohandas, P. Dean, L. Li, E. H. Linfield, A. G. Davies, A. D. Wieck, and N. Jukam, Two-dimensional coherent spectroscopy of a THz quantum cascade laser: observation of multiple harmonics, Optics Express 25, 21753 (2017).
1. S. Pal, H. Nong, S. Markmann, N. Kukharchyk, S. R. Valentin, S. Scholz, A. Ludwig, C. Bock, U. Kunze, A. D. Wieck, and N. Jukam, Ultrawide electrical tuning of light-matter interaction in a high electron mobility transistor structure, Scientific Reports 5, 16812 (2015).
Ultrafast dynamics, Nonlinear 2D terahertz spectroscopy, Time-resolved terahertz spectroscopy, Strongly correlated electronic systems, Correlation physics
The conventional weakly correlated systems are often described by the interaction of a single electron with its environment, for example, semiconductors. In contrast, the properties of the so-called strongly correlated states are determined by the collective interaction of many electrons via their charges and spins. The complexity that arises from such interactions between many particles gives rise to many fascinating phenomena. This covers the long-range magnetic order to recent discoveries like superconductivity, colossal magnetoresistance, and topological magnetic or electric states. Owing to their multi-particle nature, the microscopic understanding of the ground state with such dominant strong-correlation phenomena is a demanding task. For a thorough understanding, it is thus indispensable, however, to go away from the ground state and study the dynamical behavior of such systems.
On one hand, the functionality of a device always results from bringing it away from its ground state. Nevertheless, studying the non-equilibrium behavior of the ground state reveals the microscopic processes at work, stabilizing a strongly correlated state. Over the last years, various experimental and theoretical tools have been rapidly improving, and the field of strong-correlation dynamics is now in the process of establishing itself as a new and powerful branch in condensed-matter research. Because of the emerging nature of the field, research activities are still ambiguously diverse. Important advances are made in certain directions but at the same time, other aspects of crucial significance are disregarded — an overarching coherence of the field yet needs to be established.
The broad scope and extent of our research direction in NISER is to substantially promote this overarching coherence and contribute to building a solid foundation in the field of strong correlation dynamics. The primary research topics involve, in a broad manner: (a) Coherent low-energy excitation of correlated states and (b) Studying phase-resolved dynamics of elementary excitations.
Dr. Ranjana Rani Das (Postdoctoral researcher)
Mr. Amit Haldar (Ph.D. student)
Ms. Payel Shee (Ph.D., predoc project)
Ms. Arpita Dutta (Ph.D., predoc project)
Mr. Ashish Panigrahi (Masters' project)
Mr. Debankit Priyadarshi (Masters' Project)
External Ph.D. supervision:
Ms. Chia-Jung Yang (Ph.D. student at ETH Zurich, Switzerland)
Ms. Jingwen Li (Ph.D. student at ETH Zurich, Switzerland)
We welcome applications for positions at the Postdoctoral level with expertise in Physics/Materials Science/Optics in our new group at any time. If you have an urge on understanding physical phenomena at their roots and if you fancy what you can do with intense light, we should get in touch.
SPS Seminar/Colloquium coordinator