Ph.D. from Centre for Nano and Soft Matter Sciences
Tel.: +91 (0)80 2293 2059
Two dimensional (2D) materials in general have unique properties when compared to their bulk counterparts, whether the material is a molecular monolayer or a single layer of graphene. My research interest lies in understanding these 2D materials at various interfaces.
I am a trained experimental physicist in the field of soft matter physics that deals with formation and characterisation of monolayers and multilayers of organic thin films at interfaces. Liquid crystals (LCs) have made enormous contributions to the field of display technology as well as micro-electronics. Our interest was to explore some of the well known LCs in the form of monolayer and multilayers to find suitable applications in micro-electronics. In particular, studying rod like n-alkyl cyanobiphenyls and polymers of disc shaped LCs for their phase transition in monolayers at air-water interface and the charge transport studies across the monolayers at air-solid interface. We have also explored the dynamics of wetting and dewetting in nematic micro domains, which can help in understanding emulsions, recovery in oil spillage and so on.
My other area of research interest is in the field of inorganic two-dimensional materials. We are carrying out liquid exfoliation of two-dimensional materials like BN and study their effects in polymer composites.
M.Sc. Indian Institute of Technology, Delhi (2012)
PhD Jawaharlal Nehru University, New Delhi (2018)
Two-dimensional materials have attracted a great deal of attention within the scientific
community over the past decade owing to the unique new physics that emerges as we
transition from bulk to monolayer materials. My research interest involves the development
and study of two-dimensional materials aimed at optoelectronic devices. Also, I am interested
in metal based nanocomposites (M-TiO 2 , M-Graphene oxide (M: Ag, Au)) for photocatalytic
application and energy transfer mechanism.
Ph.D.: Bio-Nano Science Fusion (Oct 2011 – Sep 2014), Graduate School of
Interdisciplinary New Science, Toyo University, Japan.
Post-Doctoral Fellow, (Oct 2014 – Jul 2018), Bio-Nano Electronics Research Centre,
Toyo University, Japan.
Research Assistant (2011 – 2014), Bio-Nano Electronics Research Centre, Toyo
Project Assistant (2009 – 2011), National Physical Laboratory-CSIR, Delhi, India.
For pushing miniaturization limits of optical and electronic devices, it is extremely important
to achieve nanometric precision control over placement of single and multiple nanoparticles
at selective areas on a given substrate. My current research is focused on developing a novel
way for building single and multi-component devices that may have interesting emergent
optical and electronic properties.
My core research interests involve large-scale synthesis, directed assembly and advanced
characterization of 2D nanomaterials with specific application areas in multifunctional
nanocomposites, flexible-electronics, optoelectronics and sensor technologies.
Born and raised in Kolkata, India, I did my Bachelors & Masters in Physics from BidhanNagar Govt. College & Razabazar Science College, University of Calcutta, in 2006 and 2008 respectively. I then joined Prof. Dipankar Chakravorty and Dr. Sourish Banerjee for my Ph.D. in experimental Condensed Matter Physics in Indian Association for the Cultivation of Science, India. During PhD, I worked on the transport and magnetic properties of low dimensional systems, graphene and nanocomposites prepared thereof. After completion of my Ph.D. in 2013, I joined Prof. Dan Shahar in the Condensed Matter Physics department of The Weizmann Institute of Science, Israel, to work on the superconductor to insulator transition in nanowire devices made up of amorphous indium oxide. Post that, I joined Nanyang Technological University, Singapore for my second post-doctoral study in 2015, with Prof. Christos Panagopoulos and Prof. Pinaki Sengupta where my research interest was in the low-temperature magnetotransport properties in Archemidean quantum magnets. Recently, I joined this group, where my current research interest is the electrical transport and optoelectronic properties in Van der Waals heterostructure devices.
Thermo-electric transport in Van der Waal junctions.
When two planar atomic membranes are placed within the van der Waals distance, the charge and heat transport across the interface are coupled by the rules of momentum conservation and structural commensurability, lead to outstanding thermoelectric properties. My research focuses on exploring the electric and thermoelectric transport across the van der Waals gap formed in twisted bilayer graphene (tBLG). The Tunability of cross-plane Seebeck effect in van der Waals junctions may be valuable in creating a new genre of versatile thermoelectric systems with layered solids.
Publications: “Seebeck coefficient of a single van der Waals junction in twisted bilayer graphene”, P. S. Mahapatra, K. Sarkar, H. R. Krishnamurthy, S. Mukerjee and A. Ghosh(accepted Nano Letters DOI:10.1021/acs.nanolett.7b03097)
Electronic and Structural properties of Interface engineered atomically thin 2-D crystals:
Transition Metal Di-Chalcogenides (TMDCs) have gained enormous attention due to their rich electronic and structural properties i.e. direct Eg in 1L, thickness dependent Eg, spin valley coupling etc. Although TMDCs are normally semiconductors, It has been theoretically predicted that they can have a variety of crystalline phases which are normally unstable. A novel technique to stabilize one such ferroelectric phase in MoS2 has been discovered. Our spectroscopic and electronic evidences confirm that 1L MoS2 can be converted into a ferroelectric. The ferroelectric negative capacitance is being subsequently used to break the theoretical lower limit of subthreshold slope in FET.