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Department of Physics

Sourabh Barua

I am currently a post doctoral researcher in the superconductivity and magnetism group working under the supervision of Prof. Geetha Balakrishnan. My current research is on topological insulators. I plan to grow bulk single crystals and nanomaterials of various current topological insulator materials as well as new materials which are probable candidates for topological insulators. I shall study these materials using transport measurements and structural characterization techniques like X-ray diffraction and high resolution electron microscopy. I did my PhD from the Department of Physics, Indian Institute of Technology Kanpur, India in the year 2015 on the electrical transport studies of the topological insulator materials Bi2Te3, Sb2Te3 and Bi2-xSbxTe3-ySey under the supervision of Prof. K. P. Rajeev. In my PhD I looked for the signatures of the topological surface states in the transport properties of these materials using mainly the Shubnikov-de Haas oscillations in the magnetoresistance. Following is a list of my publications.

Refereed Journals:
1. Sourabh Barua, K P Rajeev and Anjan K Gupta. “Evidence for topological surface states in metallic single crystals of Bi2Te3”, Journal of Physics: Condensed Matter 27, 015601 (2015).
2. Sourabh Barua and K. P. Rajeev. “Status of surface conduction in topological insulators”, AIP Advances 4, 017135 (2014).
3. Sourabh Barua and K. P. Rajeev. “Quantum oscillations with non-zero Berry phase from a complex three dimensional Fermi surface in Bi2Te3, eprint arXiv:1504.02386.” (Communicated)

Conference Proceedings:
1. Sourabh Barua and K. P. Rajeev. “Thickness dependence of electrical transport: A test for surface conduction in topological insulators”, AIP Conf. Proc. 1583, 178 (2014). 27th International Conference on Defects in Semiconductors 2013, Bologna, Italy.
2. Sourabh Barua, Rohan Poojary and K. P. Rajeev. “Observation of Coulomb blockade and Coulomb staircase in a lateral metal nanostructure”, AIP Conf. Proc. 1512, 316 (2013). 57th DAE solid state physics symposium 2012, IIT Bombay.