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Q-NET young researchers

Sayanti SAMADDAR
Institut Néel, CNRS & UJF, Grenoble, France
Female, Indian


sayanti

Diplomas:
puce Bachelor of Science (Physics), Jadavpur University, Kolkata (2009)
puce Master of Science (Physics), Indian Institute of Technology, Kanpur (2011)

Fields of Research:
Nanophysics

Research Experience:
hjg Study of the effect of disorder on the Superconducting properties of Niobium Nitride thin films using Scanning Tunneling Microscopy. This project was done under the guidance of Dr. Pratap Raychoudhuri, as part of Visitors’ Students Research Program (VSRP), (Tata Institute of Fundamental Research, Mumbai ,2010)

hjg Synthesis of epitaxial films of La0.67Sr0.33MnO3 using Wet Chemical Method and their characterization by transport and STM. This project has been done under the supervision of Dr. Anjan Kumar Gupta as part of the M.Sc Experimental Project. (Indian Institute of Technology, Kanpur, 2010-2011)

Thesis Project:
"Scanning Probe Study of superconducting devices based on bottom-up nanostructures"

This project mainly deals with the study of electronic correlations like superconductivity and Kondo effect in electronic nanostructures involving sp2 carbon (nanotubes and graphene). The main focus will be on junctions between superconducting materials (S) and a graphene flake, which is nanopatterned as to form an electronic quantum dot.

Our goal is to go beyond transport measurements in such superconducting graphene devices and to resolve the local electronic properties at any position of such a junction. We therefore study the samples using a near-field microscope working at very low temperatures (60 mK). The conducting tip of the near-field microscope acts like a third mobile electrode to the device, which we use both in STM- and in SGM-mode. For sub-nm tip-sample distances (STM mode), the tunnel current yields direct information about the local density of states of the junction This approach therefore allows to combine and correlate in situ the transport measurements to both atomic scale topography and the local density of states. If the tip-sample distance is increased to several nanometers, applying a voltage on the tip one can locally produce an electrostatic gating effect on the device (scanning gate microscopy, SGM mode). Correlating the superconducting characteristics of the graphene junction with the tip position and the amplitude of the gate voltage again gives access to local properties of the device.


List of Publications
Disorder and screening in decoupled graphene on a metallic substrate, S. C. Martin, S. Samaddar, B. Sacépé, A. Kimouche, J. Coraux, F. Fuchs, B. Grévin, H. Courtois, C. B. Winkelmann, Physical Review B 91, 41406 (2015).

Modulating charge density and inelastic optical response in graphene by atmospheric pressure localized intercalation through wrinkles, A. Kimouche, O. Renault, S. Samaddar, C. B. Winkelmann, H. Courtois, O. Fruchart, J. Coraux, Carbon 68, 73-79 (2014).

Niobium-based superconducting nano-device fabrication using all-metal suspended masks, S. Samaddar, D. van Zanten, A. Fay, B. Sacépé, H. Courtois, C. B. Winkelmann, Nanotechnology 24, 375304 (2014).

Current position
PhD of Université Grenoble Alpes awarded on October 23th, 2015.

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