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Projects / Programmes source: ARIS

Theory of condensed matter and statistical physics

Periods
Research activity

Code Science Field Subfield
1.02.00  Natural sciences and mathematics  Physics   
1.07.00  Natural sciences and mathematics  Computer intensive methods and applications   

Code Science Field
P2   Natural sciences and mathematics  P2  

Code Science Field
1.03  Natural Sciences  Physical sciences 
Keywords
Organic and inorganic relaxor ferroelectrics, perovskite ferroelectrics, computer networks, strongly correlated electrons, high-temperature superconductors, quantum wires, surface reconstrucion, quantum chaos.
Evaluation (rules)
source: COBISS
Researchers (34)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  30219  PhD Osor Slaven Barišić  Physics  Researcher  2009 
2.  04943  PhD Janez Bonča  Physics  Head  2009 - 2014  286 
3.  34984  PhD Berislav Buča  Physics  Junior researcher  2012 - 2014  14 
4.  30868  PhD Tilen Čadež  Physics  Researcher  2009 - 2014 
5.  33317  PhD Denis Golež  Physics  Researcher  2010 - 2014  104 
6.  18270  PhD Kristjan Haule  Physics  Researcher  2009 - 2010  69 
7.  26228  Nevenka Hauschild    Technical associate  2010 - 2014 
8.  37472  PhD Alen Horvat  Physics  Junior researcher  2014 
9.  33106  PhD Enej Ilievski  Physics  Researcher  2010 - 2014  38 
10.  33109  PhD Simon Jesenko  Mechanical design  Junior researcher  2010 - 2013 
11.  35465  PhD Jan Kogoj  Physics  Junior researcher  2012 - 2014  16 
12.  26458  PhD Jure Kokalj  Physics  Researcher  2009 - 2014  104 
13.  34443  PhD Ambrož Kregar  Energy engineering  Junior researcher  2011 - 2014  74 
14.  34445  PhD Zala Lenarčič  Physics  Junior researcher  2011 - 2014  73 
15.  37527  PhD Marko Medenjak  Physics  Junior researcher  2014  15 
16.  32750  PhD Marcin Piotr Mierzejewski  Physics  Researcher  2010  77 
17.  25625  PhD Jernej Mravlje  Physics  Researcher  2009 - 2014  132 
18.  35472  PhD Žiga Osolin  Physics  Junior researcher  2012 - 2014 
19.  02581  PhD Raša Matija Pirc  Physics  Researcher  2009 - 2013  295 
20.  26578  PhD Iztok Pižorn  Physics  Junior researcher  2009  10 
21.  01105  PhD Peter Prelovšek  Physics  Researcher  2009 - 2014  424 
22.  12279  PhD Tomaž Prosen  Physics  Researcher  2009 - 2014  502 
23.  04544  PhD Anton Ramšak  Computer science and informatics  Researcher  2009 - 2014  199 
24.  19162  PhD Tomaž Rejec  Physics  Researcher  2009 - 2014  69 
25.  01100  PhD Igor Sega  Physics  Researcher  2009 - 2014  69 
26.  34248  PhD Robin Steinigeweg  Physics  Researcher  2011 - 2012 
27.  06358  PhD Bosiljka Tadič  Physics  Researcher  2009 - 2014  368 
28.  16406  PhD Darko Veberič  Physics  Researcher  2014  702 
29.  29545  PhD Lev Vidmar  Physics  Researcher  2009 - 2014  136 
30.  01121  PhD Igor Vilfan  Physics  Researcher  2009  105 
31.  24277  PhD Mihael-Matjaž Zemljič  Physics  Researcher  2009 - 2013 
32.  23567  PhD Rok Žitko  Physics  Researcher  2011 - 2014  253 
33.  21369  PhD Marko Žnidarič  Physics  Researcher  2009 - 2014  149 
34.  30657  PhD Bojan Žunkovič  Physics  Junior researcher  2009 - 2012  33 
Organisations (2)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  91,035 
2.  1554  University of Ljubljana, Faculty of Mathematics and Physics  Ljubljana  1627007  34,301 
Abstract
We will investigate microscopic physical mechanisms which are responsible for the giant electrostriction and piezoelectric effects in organic and inorganic relaxor ferroelectrics. A model of perovskite ferrolectrics such as barium titanate will be developed, based on the off-center positions of the Ti ions and their coupling to lattice vibrations. By means of computer modeling of transport on complex networks and their topology we will make a comparative study of information traffic on technological networks and genetic regulatory networks. We will determine the parameters of transport and drivUnding conditions adjusted to optimal use of the underlying network structure. We will furthermore simulate anomalous diffusion of individual grains in cellular automata models of granular flow and spin diffusion in disordered ferroelectrics under global driving conditions. Within the research field of strongly correlated electrons, as related to theoretical modeling and understanding of material properties of new high temperature superconducting materials the efforts will be dedicated to a) the development of new numerical methods as relevant to model Hamiltonians on finite lattices, b) to the theoretical understanding of the mechanism of superconductivity in cuprate superconductors, c) to the investigation of transport properties of low-dimensional quantum systems in conjunction with the integrability of related model Hamiltonians, and d) to the study of the dynamical stability of quantum system as relevant to quantum computing. Using new numerical techniques we furthermore plan to study the problem of conductance of an interacting mesoscopic sample. This approach will be based on variational wave function calculation and the quantum Monte Carlo method applied to one-dimensional systems with broken time reversal symmetry. Finally, the electronic and structural properties of ultrathin metallic layers and nanoparticles will be studied by combining ab-initio and semi-empirical methods.
Significance for science
In the theory of strongly correlated electrons we mainly address issues related to models related to the phenomenon of high-Tc superconductivity, to frustrated spin systems and to their anomalous thermal and transport properties. The ever growing list of new materials, while tantalizing for materials' physical properties, offers unforeseen opportunities for technological applications in many areas of human activity (e.g., high transition temperature to superconducting state, anomalously large thermal conduction of certain low-dimensional insulating spin systems etc.). The theoretical investigations in the field of nanosystems are of great importance for the understanding and development of new nano-devices and their potential application in e.g., medicine, public administration and affairs, households, etc.. Equally important is the subject of our third research topic, the quantum computing and informatics, where a thorough understanding of decoherence effects is instrumental to an effective implementation of quantum computation algorithms and communication protocols. This subject is of great importance for the field of cryptography. The fourth topic originates from the more general field of statistical mechanics and is devoted to the study of the complex dynamical systems and networks, a topic with potentially large impact in a vast area of socio-economic infrastructure, and to relaxor ferroelectrics, materials exhibiting properties of great interest for applications. Last, but not least, efforts will be devoted to the development and application of novel numerical methods for quantum systems. As already noted, we have been able to develop such a method in the past and aim to upgrade the method and invent new ones.
Significance for the country
We are confident that our community as a whole benefits from our research efforts – which we strive to keep on an as high level as possible – for several reasons. While keeping pace with research at the forefront of the many topics in statistical physics and physics of the solid state, we are able to competitively interact with research groups worldwide, thus providing direct means for the enrichment of national scientific and cultural heritage. Organization of international conferences, citations of our work in review articles, publication of our research results in renowned journals, membership in international boards, joint EU projects and bilateral projects worldwide, all these contribute to the recognition of Slovenia as a modern European country with a well developed scientific and technological basis. Our achievements contribute also to our self awareness and confidence as a small nation amid the global community. We would like to underscore two more spin-off segments of our research activity for the nationwide benefit: the education of students and young researchers through the constant involvement in teaching processes at the Universities of Ljubljana and Maribor and at the J. Stefan International Postgraduate School. Another segment is maintenance of high-level research conditions, being a sine-qua-non for achieving a high added value to our domestic “products”, either intellectual or material, in the world of global economy.
Audiovisual sources (1)
no. Title (with video link) Event Source
1. Theory of condensed matter and statistical physics    Research programme video presentation 
Most important scientific results Annual report 2009, 2010, 2011, 2012, 2013, final report, complete report on dLib.si
Most important socioeconomically and culturally relevant results Annual report 2009, 2010, 2011, 2012, 2013, final report, complete report on dLib.si
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