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Projects / Programmes source: ARIS

Posamezni magnetni atomi in magnetne nanostrukture na površinah kovin (Slovene)

Research activity

Code Science Field Subfield
1.02.01  Natural sciences and mathematics  Physics  Physics of condesed matter 
Evaluation (rules)
source: COBISS
Researchers (1)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  23567  PhD Rok Žitko  Physics  Head  2009 - 2011  253 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  91,322 
Significance for science
During the past years, the exceptional role and applicability of the numerical renormalization group (NRG) methods for solving quantum impurity problems was demonstrated. The implementation of this technique in the form of the NRG Ljubljana package has been namely applied to a number of problems; in addition to the problems within the specific scope of this particular research project also some more general problems have been tackled. In the field of magnetic atoms and nanostructures on metal surfaces, the NRG method has been applied to show that it is possible to very accurately study magnetic impurities if they are adsorbed on superconductor surfaces, since at low energies the spectra exhibit sharp resonances which may be detected using the low-temperature tunneling spectroscopy. Such resonances have in fact already been detected, but they have been incorrectly interpreted in published works. Combining experimental results and numerical calculations, it should be possible to extract such fundamental properties of the impurities as their spin, magnetic anisotropy and exchange interactions. This procedure could well be developped into a new spectroscopic technique. In the wider field of quantum impurity physics, the role of the finite temperature effects in the transport properties of quantum dots has been emphasized (which can change the transport characteristics as compared to the zero temperature), as well as the importance of taking into account all the physical interactions which might be in competition. Here as well, the NRG method has proved to be one of the very few tools which make it possible to perform such computations, therefore it was possible to obtain correct results for a number of problems where competing methods provide wrong or misleading results. An important contribution to the science is thus the development of the method and its implementation which may give definitive answers rather than approximate ones (which later often turn out to be insufficient).
Significance for the country
The results established within the scope of the projects have been published in prestigious international scietific journals, which contributes to the promotion of the country. The increased interest from abroad indicates more widespread use of the packages "SNEG" and "NRG Ljubljana", which has furthermore lead to several international cooperation, in which calculations based on the mentioned packages played a key role. This strengthens the position of Slovenia in the international research community.
Most important scientific results Annual report 2009, 2010, final report, complete report on dLib.si
Most important socioeconomically and culturally relevant results Final report, complete report on dLib.si
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