Research Profile: Computational condensed matter physics and materials science. In particular, application of ‘Density Functional Theory’ based first-principlesmethod to study and understanding of structural, electronic and magnetic properties of novel materials. The objective is to deigning new materials for technological importance, mainly in spintronics, energy storage and multiferroic devices.
Present Position:
Post-doctorate Research Associate,
School of Applied and Engineering Physics,
Cornell University,
271 Clark Hall, Ithaca, NY-14853, USA
E-mail: sg827@cornell.edu
Period of Research in this Lab:September 2004 - March 201
Project in this lab: During my research period in “Materials Simulation Lab”, I was involved in first-principles investigation of Nano-structured diluted magnetic semiconductors (DMS) and oxides (DMO). In particular, transition metal (TM=Fe, Co, Ni) doped in II-VI and III-V nanostructured materials, viz. empty cage (Cd12S12, Cd28Se28, Zn28O28 etc.) and core/shell nanoclusters (Cd33Se33, Cd34Se34etc), nanowires and nanotubes etc. The fundamental questions that I have investigated are: (a) the location (for example, surface or subsurface in host semiconducting nanowire?) of the impurity TM atoms when doped in nanostructured DMS materials and the correlation with the magnetic ground state i.e. Ferromagnetic (FM) vs. Antiferromagnetc (AFM), (b) Role of defects/additional carriers in promoting FM in this class of DMS/DMO and (c) How nanostructured DMS can be deign to achieve desire properties? For example, by TM encapsulation in BN nanotube (BNNT) we can achieve high spin-polarization? And at the same time can we functionalize the inert BNNT?
M.Sc in Applied Physics (Specialization: Materials Physics), 2003
Bengal Engineering and Science University, Shibpur, West Bengal, INDIA
Research Areas and Interest:
Nanostructured diluted magnetic semiconductors and oxides: coupling mechanism, role of defects and search for long ranged ferromagnetic coupling.
Nanostructured materials of Boron Nitride and Carbon: magnetic properties when doped with Transition metal atoms, Role of defects in these systems, chemical activity through defects.
Transition metal and Rare-earth clusters (in bare and in confined geometry): study of non-collinear magnetism in these systems.
Simple and layered perovskite materials: octahedral rotation driven polarization-magnetization coupling.
Doctoral / project thesis title with year of degree from university/institute:
Ph.D. in Physics, March 2011
Doctoral thesis titled: ’First-principles Investigation of Nanostructured Diluted Magnetic Semiconductor and Oxides’
Jadavpur University, Kolkata, West Bengal, INDIA.
List of publications (if any) in this lab:
1. ”Co:CdS Diluted Magnetic Semiconductor Nanoparticles : Radiation Synthesis, Dopant-Defect Complex Formation, and Unexpected Magnetism”
Kashinath A. BogleSaurabh Ghosh, Sanjay D. Dhole, Vasant N. Bho- raskar, Lian-feng Fu, Miao-fang Chi, Nigel D. Browning, DarshanKundaliya, Gour P. Das and Satishchandra B. Ogale. Chem. Mater., 2008, 20 (2), p.440.
2. ”Electronic Manifestation of Cation-Vacancy-Induced Magnetic Moments in a Transparent Oxide Semiconductor: Anatase Nb:TiO2”, Shixiong Zhang, Satishchandra B. Ogale, Weiqiang Yu, XingyuGao, Tao Liu, Saurabh Ghosh, Gour P. Das, Andrew T. S. Wee, Richard L. Greene, ThirumalaiVenkatesan. Advanced Materials, 2009, 21 (22), p.2282.
3. ”Structural, electronic and magnetic properties of Cr-doped Cd12S12 clusters: A density functional investigation, Saurabh Ghosh, B Sanyal, G.P. Das. Journal of Magnetism and Magnetic Materials, 2010, 322 (6), p.734.
4. ”Density functional calculations of hole induced long ranged ferromagnetic ordering in Mn doped Cd28Se28 nanocluster” Saurabh Ghosh, B. Sanyal, and G. P. Das. Appl. Phys. Lett. 2010, 96, p.052506. Also reprinted in Vir. J. Nan. Sci Tech. 21(7), 15 Feb 2010 issue.
5. ”Novel properties of boron nitride nanotubes encapsulated with Fe, Co and Ni nanoclusters” Saurabh Ghosh, Sandeep Nigam, G. P. Das, and ChiranjibMajumdar. J. Chem. Phys., 2010, 132, p.164704. Also reprinted in Vir. J. Nan. Sci Tech. 21 (19), 10 May 2010 issue.
6. ”Magnetism in ZnO nanowires with Fe/Co codoping: First-principles density functional calculations” S. Ghosh∗, Q. Wang, G. P. Das and P. Jena. Phys. Rev. B, 2010, 81, p.235215. Also reprinted in Vir. J. Nan. Sci Tech. 22 (1), 2 July 2010 issue.
7. ”Density functional calculations of carrier induced ferromagnetism in Co doped Cd28Se28 nanocluster” Saurabh Ghosh, B. Sanyal, and G. P. Das.
Solid State Physics, Proceedings of the 55th DAE Solid State Physics Symposium 2010, AIP Conf. Proc., 2011, 1349, p.299.
Web link:http://fenniegroup.aep.cornell.edu/about-us/
