Division of Materials Theory, Department of Physics and Astronomy, Uppsala University
Postal address: Department of Physics and Astronomy, Box 530, SE-751 21 Uppsala, Sweden
Visiting address: Ångström Laboratory, Lägerhyddsvägen 1, Uppsala
Web page: http://www.fysik.uu.se/cmt
Contact persons: Professor Biplab Sanyal,
phone +46(0)18 471 3624.
Contact: Professor Rajeev Ahuja,
phone +46 (0)18 471 36 26
In 2008, the former Theoretical Magnetism Group, and Condensed Matter Theory Group merged into one: The Division of Materials Theory.
The department of Physics and Astronomy was formed in January 2010 by merging the former department of Physics and Astronomy with the department of Physics and Materials Science.
The research group is involved in an Indian-Swedish collaboration project titled ”
Swedish participants in the project: Professor Olle Eriksson (principal investigator) and Professor Biplab Sanyal, Dept. of Physics; and Professor Per Nordblad, Solid State Physics, Department of Engineering Sciences, Uppsala University.
Principal investigator on the Indian side is Prof. Abhijit Mookerjee from the S. N. Bose National Center for Basic Sciences, Kolkata (photo to the right). Two colleagues from the same research centre are also participating in the project, namely Dr. Pratip Kumar Mukhopadhyay and Dr. Tanusri Saha-Dasgupta. A fourth Indian research partner is Dr. Dipankar Das from the Department of Atomic Energy, UGC-DAE Consortium for Scientific Research, Kolkata Centre.
As part of the project an Asia-Sweden Research Links conference on Magnetism in Materials is held in Kolkata, India, 8–10 January 2007. The idea of this meeting is to present results of current research interests and exchange ideas between Indian and Swedish researchers for future collaboration. More information about the Kolkata conference.
Project Abstract: Magnetic transition metal alloys are extremely interesting from both the understanding of basic magnetism and applications to technological advancements. For the last few decades, these alloys have been studied exhaustively by both theoretical and experimental techniques. Still there exists a perpetual interest to study them due to the possibilities of new technological innovations e.g. magnetoelectronics. Materials, e.g., FePt and CoPt, used in magnetic storage devices, are indispensable for today’s world.
Within this collaboration, a workshop was held in January 2008 in Kolkata, India jointly organized by S.N. Bose National Center for Basic Sciences, Indian Association for the Cultivation of Sciences, Kolkata and Uppsala University, Sweden. It was titled "Workshop and Conference on Electronic Structure Theory : Methods and Applications". Apart from theoretical talks, computer sessions were organized for hands-on exercises to calculate the properties of materials. Previously in January 2007, another workshop on magnetic materials was held where both theoreticians and experimentalists from Sweden and different parts of India gave lectures and shared their knowledge with younger people. During 2006 to 2008, several visitors (mainly young Ph.D. students) visited the Department of Physics at Uppsala University for several months. Also, senior researchers visited the institutions at the two countries. This collaboration was very successful in terms of scientific publications also.
In November 2008, Dr. Biplab Sanyal received SEK 600 000 as a three-years research grant for the period 2009–11 from the Swedish Research Links programme (funded by Sida and the Swedish research Council) for a India related project titled ”
The main collaboration partner on the Indian side has been Prof. Dilip Kanhere from the Dept. of Physics, University of Pune.
Swedish co-applicants are Prof. Olle Eriksson, Dr. Susanne Mirbt, and Dr. Jonas Fransson, all at Uppsala University. Indian co-applicants are Prof. Abhijit Mookerjee, S. N. Bose National Center for Basic Sciences, Kolkata; Associate Prof. Anjali Kshirsagar, Dept. of Physics, University of Pune; and Dr. Kavita Joshi, also from the Dept. of Physics, University of Pune.
Project abstract: The project deals with the theoretical studies of the physical properties of Quantum Dots, the entities, which are vital for nanotechnological applications. The aim is to study the electronic, structural, magnetic and transport properties of these nano-scale entities by accurate first-principles density functional calculations, many body exact configuration interaction and formalism of equilibrium and non-equilibrium electron transport. The participation of Swedish and Indian researchers of various complementary expertises carries a unique feature of the present constellation. The collaboration will be set by exchange visits, organization of workshops and schools for training and education of young researchers and exchange of softwares between the research groups. The outcome of this project will be the knowledge base and understanding of the physics of realistic materials-specific Quantum Dots, which will help the experimentalists to grow and characterize these nano-scale entities.
In November 2011, Biplab Sanyal received SEK 719 000 as a three year grant (2012-14) from the Swedish Research Links programme (funded by Sida and the Swedish Research Council) for a project entitled ”Theory of Phonon Excitations in Substitutionally Disordered Alloys” in collaboration with Subhradip Ghosh, Indian Institute of Technology Delhi (IIT), Guwahati. More information on the Swedish Research Links grants 2012.
Project abstract: The study of elementary excitations (electrons, phonons,magnons) in complex materials having substitutional disorder is one of the emerging areas in computational materials science research as disorder is an important control parameter to tailor materials with target properties. Specifically, phonon spectra are essential for thermodynamic properties and hence phase diagrams. However, first principles calculation of phonon spectra in disordered alloys is a challenging problem due to difficulties in computing the inter-atomic interactions in a random environment. In this project, Sanyal and Ghosh aim to devise a unique formalism for lattice dynamics in disordered alloys combining first-principles electronic structure methods, physically realistic models of chemical disorder and an analytic mean-field based method for configuration averaging. The effects of short-range order, partial disorder and temperature on the vibrational properties will be studied to interpret the experimental results available for binary metallic alloys, multi-component shape memory alloys, multi-component semiconductor alloys, partially disordered perovskite ferroelectrics and doped multiferroic materials. One of the key objectives will be to build up a database of inter-atomic force constants to serve as a ready reference for the community. This collaboration between Uppsala University and IIT, Guwahati, India involves exchange visits, organization of schools to train young scholars and joint publications.
Professor Rajeev Ahuja (photo) is connected to a research project on ”
In November 2006, Associate Professor Lars Nordström received SEK 600 000 as a three-years (2007-09) Swedish Research Links grant (provided by Sida/SAREC and the Swedish Research Council) for a research project titled ”A joint theoretical and experimental study of diluted magnetic semiconductors”. The project will be carried out in collaboration with the Indian Institute of Technology (IIT) in Mumbai, India. The main collaboration partners are Associate Prof. Indra Dasgupta and Associate Prof. K. G. Suresh.
Besides Dr. Nordström, the Uppsala University research team consists of Prof. Biplab Sanyal (see information above); Associate Prof. Olof Karis, Surface Physics Group; and Professor Peter Svedlindh, Dept. of Engineering Sciences.
More information about the 2006 Swedish Research Links grants related to South Asia.
Project abstract: The field of spintronics has opened up a new dimension in information technology, not only enhancing established microelectronics concepts by introducing magnetic functionality, but also by providing exciting opportunities for completely new device ideas. In the modern technology, information is carried by charge currents, localized magnetic moments are used for storing data, and light beams are used for information transmission. But there is a growing recognition that devices exploiting spins of electrons can be used as information carriers, so-called spintronic devices, can exhibit performance superior to conventional electronic devices. The advantages of these new devices would be nonvolatility, increased data processing speed, decreased electric power consumption, and increased integration densities compared with conventional semiconductor devices. Diluted magnetic semiconductors (DMS) are essential ingredients for semiconductor spintronics, which combines the charge and spin degrees of freedom of electrons to manipulate the properties of the traditional charge-controlled semiconductor devices. Despite extensive experimental and theoretical research, the fundamental understanding of these systems is far from being complete. A microscopic understanding is necessary to characterize and manipulate the properties and to design new materials with novel characteristics. This proposal aims to build up a concerted theoretical and experimental activity on important materials, e.g., Co doped ZnO and other oxide DMS as well as transition metal doped Heusler and half-Heusler materials. The theoretical approach will be based on ab initio electronic structure calculations and the experimental research will include sample preparations, structural and magnetic characterizations using XRD, SQUID, XAS and XMCD measurements.
In November 2007, Dr. Rajeev Ahuja received SEK 450 000 as a three-years (2008-10) Swedish Research Links grant (provided by Sida/SAREC and the Swedish Research Council) for a research project titled ”
More information about the 2007 Swedish Research Links grants related to South Asia.
Project abstract: Our energy-hungry world has become increasingly depending on new methods to store and convert energy for new, environmentally friendly modes of transportation and electrical energy generation as well as for portable electronics . Mobility – the transport of people and goods – is a socioeconomic reality that will surely increase in the coming years. It should be safe, economic and reasonably clean. Hydrogen would be ideal as a synthetic fuel because it is lightweight, highly abundant and its oxidation product (water) is environmentally benign. However, the storage remains a problem for this highly desirable development. Here we present a proposal where we focus on the search for innovative materials with high hydrogen-storage capacity. We propose to perform theoretical and experimental studies of such materials, with the purpose toidentify and improve the most important materials parameters. From the gained knowledge, we will invent materials which will enable improved devices and constructions. Hence we propose to focus new activities in the study of materials of significance in energy applications. This type of research have national importance for any country and they address two of the critical issues for a new hydrogen economy.
In December 2009, Prof. Peter Oppeneer (photo) received SEK 730 000 as a three-year International Collaborative Research Grant from the Swedish Research Links programme (funded by Sida and the Swedish Research Council) for a India related project entitled ”
The research project has been carried out in collaboration with Dr. Tanusri Saha-Dasgupta, S.N. Bose National Centre for Basic Sciences, in Kolkata.
Project abstract: The topic of the research collaboration is the theoretical investigation of magnetism in organic materials, using large-scale quantum-chemical computer simulations. Both groups have a proven record in computational theory of magnetism in organometallic materials, yet focusing thus far on complementary aspects. The Indian group studies spin-crossover phenomena in spin-transition polymers, whereas the Swedish group studies the magnetic properties of bio-molecules adsorbed on metallic surfaces. Magnetic phenomena in organometallic molecules hold potential for applications in data storage, optical switches or magnetic detectors, and molecular spintronics devices. It is the aim of collaborative project to bring these two groups together, to stimulate the interactions between the two groups, and thus fertilize the connections between India and Sweden. Within the research program this aim will be pursued through mutual research visits, scientific collaboration and joint workshops.
Another researcher within the same department, Prof. Olle Eriksson, also received a three-year International Collaborative Research Grant from the Swedish Research Links programme in December 2009. Prof. Eriksson received SEK 710 000 for a research project entitled ”
It has been carried out in collaboration with Prof. Dipankar Das Sarma, Solid State and Structural Chemistry Unit, Indian Institute of Science (IISc) in Bangalore.