Completed his PhD in Physics at Jacobs University Bremen, Germany, in March 2012. Worked as a post-doctoral fellow at Lund University from 2012 to 2015 and then as an independent researcher (supported by the Swedish Research Council) from 2016 to 2019. Worked at many leading institutes including European Synchrotron Research Facility (ESRF, France), FOM Institute for Atomic and Molecular Physics (AMOLF, the Netherlands), and Max-Planck Institute for Quantum Optics (MPQ, Germany) during university education. Specialization in optical nonlinear spectroscopy. One of the active developers of fluorescence and photocurrent detected two-dimensional spectroscopy. Main research focus is on investigating the role of photon induced quantum coherence in the functioning of photo-active devices (both natural and man-made). Important results have been published in Nature Communications, Physical Review Letters, Chemical Science, Journal of Physical Chemistry Letters, ACS Energy Letters, Physical Review A, etc.
- Phase modulation
- Fluorescence and photocurrent detected two-dimensional spectroscopy
- Coherent excitations
- Semiconductors
- Superconductors
KJ Karki, J Chen, A Sakurai, Q Shi, AT Gardiner, O Kuehn, RJ Cogdell, T Pullerits, Before Föster. Initial Excitation in Photosynthetic Light Harvesting, Chemical Science 10, 7923-7928 (2019).
Q Bian, F Ma, S Chen, Q Wei, X Su, I Buyanova, WM Chen, CS Ponseca, M Linares, KJ Karki, A Yartsev, O Inganäs, Vibronic Coherence Contribute to Photocurrent Generation in Organic Semiconductor Heterojunction Diodes, Nature Communications 11, 617 (2020).
KJ Karki, MF Ciappina, Advances in Nonlinear Spectroscopy Using Phase Modulated Light Fields: Prospective Applications in Perturbative and Non-perturbative Regimes, Advances in Physics X 7, 2090856 (2022).
C Wang, J Cai, X Liu, C Chen, X Chen, KJ Karki, In Operando Quantification of Single and Multiphoton Photocurrents in GaP and InGaN Photodetectors with Phase-Modulated Femtosecond Light Pulses, ACS Photonics 10, 1119-1125 (2023).