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Department of Physics
Subhra Sen Gupta
Assistant Professor,
Department of Physics,
School of Natural Sciences
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Education Details
Ph.D. (Physics) with specialization in Condensed Matter Theory (Indian Institute of Science, Bangalore, 2007).
M.S. (Physical Sciences), as a part of the Integrated Ph.D. Course (Indian Institute of Science, Bangalore, 2000).
B.Sc. (Physics Hons.) from St. Xavier’s College, Kolkata (University of Calcutta, 1997).

Professional Experience
Dec. 2014 - Present : Assistant Professor, Department of Physics, School of Natural Sciences, Shiv Nadar University (SNU), Greater Noida, INDIA.

Jan. 2013 - Dec. 2014 : RIKEN Foreign Postdoctoral Researcher (FPR) Fellow, RIKEN, Wako, JAPAN.

Mar. 2012 - Dec. 2012 : Visiting Research Associate, Department of Condensed Matter Physics and Material Science, S. N. Bose National Centre for Basic Sciences (SNBNCBS), Kolkata, INDIA.

Mar. 2008 - Feb. 2012 : Postdoctoral Research Fellow, Department of Physics & Astromony, University of British Columbia (UBC), Vancouver, CANADA. (At times co-appointed as a Postdoctoral Teaching Fellow).

Jan. 2007 - Feb. 2008 : Postdoctoral Fellow, Department of Material Science, S. N. Bose National Centre for Basic Sciences (SNBNCBS), Kolkata, INDIA.
Research Interests
Electronic and magnetic properties of strongly correlated electron systems : Including mixed-valent systems, systems with strong spin-orbit coupling (e.g., 4d and 5d transition metal oxides), systems exhibiting exotic spin-orbital and hidden order.

Modeling of x-ray spectroscopies : e.g. XAS, AES, XPS, NIXS, RIXS etc. and optical conductivity (normal and high-energy) in strongly correlated systems.

Spin/orbital magnetism and magneto-crystalline anisotropy in nano-structured materials : e.g., surfaces/thin-films/multilayers/nano-particles etc.

Development of new computational tools for correlated electron systems.
Select Publications
Localized to Itinerant Crossover and Breakdown of the Local Hund’s Rule Ground State due to Strong Hybridization Effects in Correlated Systems : Subhra Sen Gupta* and G. A. Sawatzky. (To be submitted)

Bond Polarizability and large modification of the Hubbard U at the spin-state transition in Cobaltates : Subhra Sen Gupta* and G. A. Sawatzky. (To be submitted)

Spin orientation - a subtle interplay between strain and multipole Coulomb interactions : Subhra Sen Gupta, Priya Mahadevan, Suman Mandal and Krishnakumar S.R. Menon and D. D. Sarma. (To be submitted)

Coexistence of Bound and Virtual-bound States in Shallow-core to Valence X-ray Spectroscopies : Subhra Sen Gupta*, J. A. Bradley, M. W. Haverkort, G. T. Seidler, A. Tanaka, and G. A. Sawatzky, Phys. Rev. B 84, 075134 (2011).

The Importance of Inter-site Coherences in the X-ray Absorption Spectra of Mixed-valent Systems” : Subhra Sen Gupta*, Hiroki Wadati and G. A. Sawatzky, Europhysics Letters 93, 47008 (2011).

Probing electronic correlations in actinide materials using multipolar transitions : J. A. Bradley, Subhra Sen Gupta, G. T. Seidler, K. T. Moore, M. W. Haverkort, G. A. Sawatzky, S.D. Conradson, D. L. Clark, S. A. Kozimor, and K. S. Boland, Phys. Rev. B 81, 193104 (2010).

Supramolecular control of the magnetic anisotropy in two-dimensional high-spin Fe arrays at a metal interface : P. Gambardella, S. Stepanow, A. Dmitriev, J. Honolka, Frank de Groot, M. Lingenfelder, Subhra Sen Gupta, D. D. Sarma, P. Bencok, S. Stanescu, S. Clair, S. Pons, N. Lin, A. P. Seitsonen, H. Brune, J. V. Barth and K. Kern, Nature Materials (Letters) 8, 189 (2009).

Theory of the unusual doping and temperature dependence of photoemission spectra in manganites : Prabuddha Sanyal, Subhra Sen Gupta, Nandan Pakhira, H. R. Krishnamurthy, D. D. Sarma and T. V. Ramakrishnan, Europhysics Letters 82, 47010 (2008).

Spin-flop ordering from frustrated ferro- and antiferromagnetic interactions: A combined theoretical and experimental study of a Mn/Fe(100) monolayer : C. Grazioli, D. Alfe, S.R. Krishnakumar, Subhra Sen Gupta, M. Veronese, S. Turchini, N. Bonini, A. Dal Corso, D. D. Sarma, S. Baroni and C. Carbone, Phys. Rev. Lett. 95, 117201 (2005).

X-ray absorption spectroscopy of transition-metal doped oxide diluted magnetic semiconductors Zn1-xMxO : J. Okabayashi, K. Ono, M. Mizuguchi, M. Oshima, Subhra Sen Gupta, D. D. Sarma, T. Mizokawa, A. Fujimori, M. Yuri, C.T. Chen, T. Fukumura, M. Kawasaki and H. Koinuma, J. Appl. Phys. 95, 3573 (2004).

Synthesis and Characterization of Mn doped ZnO Nanocrystals : Ranjani Viswanatha, Sameer Sapra, Subhra Sen Gupta, B. Satpati, P. V. Satyam, B. N. Dev and D. D. Sarma, J. Phys. Chem. B 108, 6303 (2004).
National and International Recognition
Invited Talk at the University of Tokyo, Japan. (November 2014).

Invited Talk in the 6th Indo-Japan Meeting on Physics & Design of Multi-functional Correlated Materials, University of Tokyo, Japan (March 2014).

Invited Lecture in the Indo-EU ATHENA -2012 Advanced School on Modeling Complex Oxides, S. N. Bose National Centre for Basic Sciences, Kolkata, India (April, 2012).

Invited Talk at the S. N. Bose National Centre for Basic Sciences, Kolkata, India (January, 2011).

Invited Talk in the X-Ray Scattering Workshop, Stanford Institute of Materials and Energy Sciences, SLAC, Stanford University, Palo Alto, USA. (August, 2009).

Selected for the prestigious RIKEN Foreign Postdoctoral Researcher (FPR) Fellowship, RIKEN, Japan (about 20 candidates selected Internationally every year, including the fields of Physics, Chemistry, Biology, Medicine and Engineering) (2012).

Post-doctoral Fellow in the Sawatzky Group, at the University of British Columbia, Vancouver, Canada (2008-2012).

IFCPAR Post-doctoral Fellow, at S.N. Bose National Centre for Basic Sciences, Kolkata, India (2007-2008).

Senior Research Fellowship (Ph.D.) of the Indian Institute of Science, Bangalore, India (2002-2004).

Junior Research Fellowship (Ph.D.) of the Indian Institute of Science, Bangalore, India (1999-2001).

Best Poster Award at the Unit Day of SSCU, IISc (2004).

CSIR-NET Lecturership (Govt. of India) (2000).

Integrated Ph.D. Fellowship of the Indian Institute of Science, Bangalore, India (1997-1999).

National Merit Scholar (1997) (Govt. of India) on the basis of B.Sc. (Hons.) results.

National Merit Scholar (1994) (Govt. of India) on the basis of XII std. results (ranked 40th in the state).
Executive Summary
Dr. Subhra Sen Gupta joined SNU in December 2014, from the RIKEN Wako Institute, Japan, where he started after receiving the prestigious Foreign Postdoctoral Researcher (FPR) Fellowship of RIKEN. Prior to that, he was briefly a Visiting Research Associate in the Department of Condensed Matter Physics & Material Science, S.N. Bose National Centre for Basic Sciences, Kolkata, and a Post-doctoral Research Fellow in the renowned group of Prof. G. A. Sawatzky at the University of British Columbia, Vancouver, Canada.

Dr. Sen Gupta did his M.S. and Ph.D. in the Department of Physics, Indian Institute of Science, Bangalore, under the Integrated Ph.D. program. He is a theoretical condensed matter physicist and specializes in the field of strongly correlated electron systems, where electron-electron interactions cannot be treated as a perturbation to its motion in the crystal potential, resulting in the breakdown of conventional band-structure description for such systems, at least in the rigourous sense.

On one hand, this field helps us to better understand the exotic phenomena that can emerge out of strong, non-perturbative interactions between electrons in a narrow-band solid, like compounds of transition metals, rare-earths and actinides. On the other hand, a basic understanding of the physics of these materials helps to design “smart materials” with advanced and energy-efficient functionalities. Since treating the full correlation problem for a solid is an unsolvable problem, the challenge for theory is to continuously develop newer and more efficient analytical approximations and numerical techniques to better understand the properties of these “quantum materials”, as constantly emerging from experiments. Dr. Sen Gupta has been working in this field for more than a decade, trying to model the ground state (low-energy) as well as the spectroscopic (high-energy) properties of correlated electron systems, in collaboration with leading experts in the field, both in India and abroad. More specifically, his research interests lie in the Modeling of Electronic and Magnetic properties of Strongly Correlated Systems, X-ray Spectroscopies, Spin & Orbital Magnetism and Magneto-crystalline Anisotropy in Nano-structured materials, and development of New Computational Tools for correlated systems.
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