Srivats Rajasekaran

  • PostDoc


Condensed Matter Department,
Max Planck Institute for the Structure and Dynamics of Matter, CFEL
Bldg. 99, Rm. 02.049
Luruper Chaussee 149
22761 Hamburg, Germany

Phone: +49-(0)40-8998-6559

Short bio

Srivats completed his undergraduate studies at the Indian Institute of Technology, Delhi (India) in 2007, following which he went on to pursue his MS and PhD at the Stanford University (USA). His PhD work, performed under the supervision of Prof. Anders Nilsson at SLAC, involved the study of two dimensional systems with x‑ray spectroscopic techniques, like X-ray absorption and Resonant Inelastic X-ray Scattering (XAS and RIXS). 

After defending his PhD he joined MPSD in January 2013 with a particular interest in studying the low energy electrodynamics of collective macroscopic quantum orders, like charge density wave (CDW) and superconducting (SC) orders beyond the linear response regime. To this end, he built a table top set-up which produces high field THz transients (tilted pulse front technique utilizing LiNbO3) and studies the nonlinear dynamics of the SC order in high temperature cuprate materials. His studies are intended towards achieving coherent control over the macroscopic orders and for unraveling the complex nature of the coexistence of CDW and SC in various condensed matter systems.

Research Interests

Srivats is studying the nonlinear electrodynamics in materials possessing coexisting charge density wave and superconductor orders at THz frequencies using intense THz pulses from both, table-top sources (tilted pulse front optical rectification) and the THz Free-Electron Laser FELBE.

Selected publications

Probing optically silent superfluid stripes in cuprates
S. Rajasekaran, J. Okamoto, L. Mathey, M. Fechner, V. Thampy, G. D. Gu, A. Cavalleri
Science, 369, 6375, 575-579 (2018)  
⇒ Perspective (superconductivity): Lighting up superconducting stripes, Emre Ergeçen + Nuh Gedik, Science, 369, 6375, 519 (2018)  
Dynamical stability limit for the charge density wave in K0.3MoO3
R. Mankowsky, B. Liu, S. Rajasekaran, H. Liu, D. Mou, X. J. Zhou, R. Merlin, M. Först and A. Cavalleri
Physical Review Letters, 118, 116402 (2017)  
Parametric Amplification of a Terahertz Quantum Plasma Wave
S. Rajasekaran, E. Casandruc, Y. Laplace, D. Nicoletti, G. D. Gu, S. R. Clark, D. Jaksch, A. Cavalleri
Nature Physics, 12, 1012–1016 (2016)  
→ Press releases  
High-Field High-Repetition-Rate Sources for the Coherent THz Control of Matter
B. Green, S. Kovalev, V. Asgekar, G. Geloni, U. Lehnert, T. Golz, M. Kuntzsch, C. Bauer, J. Hauser, J. Voigtlaender, B. Wustmann, I. Koesterke, M. Schwarz, M. Freitag, A. Arnold, J. Teichert, M. Justus, W. Seidel, C. Ilgner, N. Awari, D. Nicoletti, S. Kaiser, Y. Laplace, S. Rajasekaran, L. Zhang, S. Winnerl, H. Schneider, G. Schay, I. Lorincz, A. A. Rauscher, I. Radu, S. Mährlein, T. H. Kim, J. S. Lee, T. Kampfrath, S. Wall, J. Heberle, A. Malnasi-Csizmadia, A. Steiger, A. S. Müller, M. Helm, U. Schramm, T. Cowan, P. Michel, A. Cavalleri, A. S. Fisher, N. Stojanovic & M. Gensch
Scientific Reports, 6, 22256 (2016)  
Wavelength-dependent optical enhancement of superconducting interlayer coupling in La1.885Ba0.115CuO4
E. Casandruc, D. Nicoletti, S. Rajasekaran, Y. Laplace, V. Khanna, G. D. Gu, J. P. Hill, and A. Cavalleri
Physical Review B, 91, 17 (2015)