After completing her Masters in Physics from Indian Institute of Technology, Kanpur, Sayanti moved to Grenoble in France to pursue her PhD at Institut Néel, CNRS, as a Marie Curie Fellow. Using a home built combined AFM/STM setup, she primarily investigated charge disorder and screening properties in graphene subjected to different dielectric environments. She set up experiments that particularly combined and correlated global transport properties with local scanning probe measurements, thus enabling a complete characterization of the system. She was awarded the prestigious Alexander von Humboldt Fellowship in 2017 to pursue her post-doctoral research in RWTH Aachen University in Germany. One of her key interests was to study how carrier dynamics evolve locally in graphene devices, which culminated in the discovery of local pockets of viscous electron flow in relatively disordered samples at room temperature and close to charge neutrality.
Her work in NPL focusses on investigating fundamental electronic properties and carrier transport in low dimensional systems like graphene, TMDs and other van der Waals heterostructures. This is enabled using powerful characterization tools like a multi-tip combined AFM/STM setup, KPFM, Raman microscope etc. Additionally, working with industrial partners to realize commercial applications for such physical systems as well as the full commercial potential of the scanning probe microscopes, would be another key target.
Areas of Interest
- Charge disorder, screening, electronic correlations and many body effects in low dimensional materials.
- Charge transfer, band bending and alignment in van der Waals heterostructures.
- Carrier dynamics and current flow in different transport regimes.
- Scanning probe microscopies like Scanning tunnelling microscopy, Kelvin probe force Microscopy, Atomic Force Microscopy and scanning tunnelling potentiometry.
Selected Publications
S. Samaddar, J. Strasdas, K. Janßen, S. Just, T. Johnsen, Z. Wang, B. Uzlu, S. Li, D. Neumaier, M. Liebmann, and M. Morgenstern, Evidence for Local Spots of Viscous Electron Flow in Graphene at Moderate Mobility, Nano Letters 21, 9365-9373 (2021).
S. Samaddar, I. Yudhistira, S. Adam, H. Courtois, and C. B. Winkelmann, Charge Puddles in Graphene Near the Dirac Point, Phys. Rev. Lett 116, 126804 (2016). (Editor’s Suggestion)
S. Samaddar, J. Coraux, S. C. Martin, B. Grévin, H. Courtois, and C. B. Winkelmann, Equal variations of Fermi level and work function in graphene at the nanoscale, Nanoscale 8, 15162 (2016)
S. Samaddar, D. van Zanten, A. Fay, B. Sacépé, H. Courtois, and C.B. Winkelmann, Niobium based superconducting nano-device fabrication using all metal suspended masks, Nanotechnology 24, 375304 (2013).
S. C. Martin, S. Samaddar, B. Sacépe, A. Kimouche, J. Coraux, F. Fuchs, B. Grevin, H. Courtois, and C. B. Winkelmann, Disorder and screening in decoupled graphene on a metallic substrate, Phys. Rev. B 91, 041406(R) (2015).
Email Sayanti Samaddar
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