Tomislav Vuletić

From real-science

Tomislav Vuletić
Institute of Physics
Bijenička 46
P O Box 304
HR-10000 Zagreb
Croatia
E-mail: tvuletic@ifs.hr
Website: http://tvuletic.ifs.hr
Phone: +385 1 4698 887
Fax: +385 1 4698 889

link to my formal CV...

Contents 1 Education 2 Positions, Projects, Professional Activities 3 Research interests 3.1 Organized molecular systems, 2003-- 3.2 Low-dimensional materials, 1998-- 4 Seminars 5 Conferences 6 Bibliography 6.1 Published articles 6.2 Articles in preparation 6.3 Other publications

Education

• 2004: Ph.D., University of Zagreb, Faculty of Science, Physics Dept.; Thesis: Collective Electronic States of the New Quasi-one-dimensional Materials thesis
• 1998: B.Sc. work: Nonlinear conductivity in quasi-one dimensional organic conductors (TMTSF)₂PF₆ and (TMTSF)₂AsF₆ thesis

Some milestones from my Uni_Zagreb experience:

• 2003: Doctoral Seminar: Fazni dijagram kvazi1D kuprata Sr_14-xCa_xCu₂₄O₄₁ (2003) presentation
• 2002: finished postgraduate and started Doctoral studies. This phase is set apart for preparation of my Thesis.
• 1999: started postgraduate studies of Condensed Matter Physics at PMF - Department of Physics. Part of the course was to present my recent research to other students. I also had to perform thorough research of the literature in some other fields. This has resulted in a few seminal papers and presentations (in Croatian):
  • Difuzno rasprsenje i difrakcija X-zraka u istrazivanju Q1D materijala (2000) paper and presentation
  • Nelinearna vodljivost Bechgaardovih soli (2001) paper and presentation
  • Transmisijska elektronska mikroskopija visokog razlucivanja HRTEM (2000) paper and presentation
  • Istrazivanja prirode supravodljive faze Sr_2RuO_4 materijala (2002) paper and presentation
  • Nehomogeni sistemi cilindricne simetrije (2002) paper
  • Prijevod na hrvatski clanka objavljenog u Eur. Phys. J. B 21, 53 - 60 (2001) paper
  • Utjecaj kvantnog Hall efekta na elektricni transport u FISDW fazi (TMTSF)_2PF_6 (2002) presentation
• 1990-1998: Faculty of Science - In order to become an educated person I chose the University of Zagreb, Faculty of Science (PMF) - Department of Physics. I heard it had the most demanding courses, but that professors/assistants do not harass the students. In this period I also served the country, spending a year in the Croatian Army barracks in picturesque Croatian cities of Koprivnica and Samobor.

• 1986-1990: high school - renowned "MIOC", Zagreb ("I" in "MIOC" stands for informatics, but I still didn't like that - now they don't like me. Windoze, that is...)
• 1978-1986: elementary school - "Antun Gustav Matos", Zagreb (it was the first elementary school in the country with computers available to pupils)

Positions, Projects, Professional Activities

• 2008-2010: Project leader PROTEASSIST project Protein Assisted DNA Monolayer Assembly. Grant by Unity through Knowledge Fund
• 2007-2011: Collaborator on the Ministry of Science project by S. Tomić Strongly correlated inorganic, organic and biomaterials
• As of 2007 I am appointed as a Scientific associate (a permanent position) at Institute of physics, Zagreb.
• 2009: Co-organizer for the Physics of Cells 2009, an EMBO event that gathered a fascinating line-up of speakers, addressing all aspects of the subject.
• 2009: Organizer of Open Day, the annual Institute of physics event for popularization of physics. That year it was my turn to attempt to increase the visibility of the Institute, and Sciences in general, amongst the high-school population.
• 2008: I have organized Christmas Biophysics Workshop, XBW 2008, the theme for this occassion were Organized molecular systems.

Research interests

Organized molecular systems, 2003--

• Since 2003, in parallel with preparing my Thesis (and out of its scope), I also joined dr. S. Tomić in her idea of entering the field of soft matter physics. Firstly, I concentrated on designing a chamber for measurement of complex impedance of samples in solution. Having finished the Thesis, I intensively switch from solid state to the physics of complex systems, polyelectrolytes and colloids in aqueous environment.
• For these systems, we demonstrated dielectric spectroscopy as a method capable of probing characteristic time and length scales in polyelectrolyte solutions - DNA being this polyelectrolyte, surrounded by its counterion atmosphere. This allowed experimental insight into DNA conformations in solution, which was not easily accesible with some more established methods, like SAXS, SANS or single molecule experiments or AFM...
• 2006-2007, I was on a post-doc in the group of F. Livolant, again at Laboratoire de Physique des Solides, Orsay, France. Here we are concerned how this interestingly "conformed" DNA is packed into functional structures, like chromatin or into sperm-heads or viruses. Again polyelectrolytic nature of DNA and various oppositely charged molecular species work together in making interesting problems for physicists.
• Specifically, I am studying RecA protein which forms a helix by polymerizing around individual DNA molecule. This complex takes care of general recombination and also of SOS response in the bacterial cell.
• 2008: My PROTEASSIST project Protein Assisted DNA Monolayer Assembly will tend to relate my work on DNA conformations with the RecA experience I gained with F. Livolant.

Low-dimensional materials, 1998--

• I started working in the research group of dr. S. Tomić, using low-frequency dielectric spectroscopy (LFDS) and linear and nonlinear transport techniques and investigating quasi1D materials: SDW phase of Bechgaard salts, Mott-Peierls CDW phase of DCNQI materials, CDW phase of quasi1D cuprates Sr_14-xCa_xCu₂₄O₄₁. My Ph.D.Thesis was based on this work.
• LFDS and most of the other low-temperature experiments are performed in the laboratory at the Institute of Physics, Zagreb. For high-pressure work on Bechgaard salts I visited (1999 & 2000) Laboratoire de Physique des Solides, Orsay, France, group of dr. D. Jérome. In 2002 & 2004 I also visited Universität Stuttgart, Germany, 1. Physikaliches Institut of dr. M. Dressel regarding the research of quasi1D cuprates.
• In this field I was primarily concentrated on experimentally identifying and characterizing the ground states of q1D materials, by varying parameters like temperature, pressure, magnetic and electric field amplitudes and frequencies.
• My work on Bechgaard salts resulted in removing the controversies about the influence of the quantum Hall effect on linear and nonlinear transport in the field-induced SDW phase of (TMTSF)₂PF₆. In (TMTSF)₂PF₆ I also confirmed coexistence of the SDW and SC phases in a narrow range of pressures where SDW phase is not yet fully suppressed and SC phase starts to appear. This work is my most cited.
• Working on copper-DCNQI materials I helped to identify the low temperature insulating phase of these materials as the N=3 commensurate CDW phase.
• Very important was my contribution to research of q1D cuprates. Here we identified a phase transition below which a CDW, characterized by a phason response in 2D, develops in the ladders subsystem of Sr_14-xCa_xCu₂₄O₄₁ materials. In related materials La_6-ySr_yCa₈Cu₂₄O₄₁ we identified hopping transport along the chain subsystem. This work culminated in a review paper discussing these materials.
• Lately, I am taking part in work of T. Ivek on BaVS₃, latest hot topic in low-dimensional materials, as the nature of its different phases is still not established

Seminars

• 2008: Seminar Hrvatskog Mikroskopijskog Društva: Pakiranje DNK s proteinima
• 2006: Tokyo University, Tokyo, Japan: The phase diagrams of chains and ladders of (La,Y,Sr,Ca)14Cu24O41
• 2006: Gakushuin University, Tokyo, Japan: The phase diagrams of chains and ladders of (La,Y,Sr,Ca)14Cu24O41
• 2006: Tokyo University, Tokyo, Japan: Fundamental length scales in aqueous Na-DNA
• 2006: Kyoto University, Kyoto, Japan: Fundamental length scales in aqueous Na-DNA

Conferences

• 2009: 4^th Xmas Biophysics Workshop, Leibnitz, Austria: presentation
• 2009: 6^th Conference of Croatian Physical Society, Primosten, Croatia: poster
• 2008: 3^rd Xmas Biophysics Workshop, D. Stubica, Croatia: presentation
• 2008: From Solid State to Biophysics IV, Dubrovnik, Croatia: presentation
• 2007: 2^nd Xmas Biophysics Workshop, Bled, Slovenia: presentation
• 2007: 5^th CIPSNAC Workshop, München, Germany: presentation
• 2007: 5^th Conference of Croatian Physical Society, Primosten, Croatia: poster
• 2007: 6^th International Conference on Biological Physics, Montevideo, Uruguay: poster
• 2007: 6^th European Biophysics Congress, London, UK: poster
• 2007: 4^th CIPSNAC Workshop, Lund, Sweden: presentation
• 2006: Xmas Biophysics Workshop, Zagreb, Croatia: presentation
• 2006: International Symposium on Anomalous Quantum Materials, Okinawa, Japan: INVITED
• 2005: 4^th Symposium of Science and Technology of Nanomaterials, Ljubljana, Slovenia: presentation
• 2005: 4^th Conference of Croatian Biophysical Society, Zagreb, Croatia: presentation
• 2005: 15^th IUPAB & 5^th EBSA International Biophysics Congress, Montpellier, France: poster
• 2005: International Workshop on Electronic Crystals, ECRYS-2005, Cargèse, France: article 18, presentation
• 2005: Workshop on BioPolymers, the Abdus Salam ICTP, Trieste, Italy: presentation
• 2004: 5^th International Conference on Biological Physics, Gothenburg, Sweden: poster
• 2004: International Conference on Low Energy Electrodynamics in Solids, Kloster Banz, Germany: poster
• 2004: From Solid State to Biophysics II, Dubrovnik, Croatia: poster
• 2003: Symmetry and heterogeneity in high temperature superconductors, Erice, Italy: poster
• 2003: 4^th Conference of Croatian Physical Society, Zagreb, Croatia: poster
• 2003: 3^rd Conference of Croatian Biophysical Society, Zagreb, Croatia: presentation
• 2002: From Solid State to Biophysics, Dubrovnik, Croatia
• 2001: 3^rd Conference of Croatian Physical Society, Zagreb, Croatia: presentation
• 2001: 5^th Conference of the Institute of Physics, Zagreb, Croatia: presentation
• 2000: International Conference on Science and Technology of Synthetic Metals, Gastein, Austria: article 5, poster
• 1999: GDR522, Matériaux moléculaires du magnétisme aux supraconducteurs organiques, Gif-sur-Yvette, France: poster
• 1999: Workshop on Electronic Crystals, ECRYS '99, La Colle-sur-Loup, France: article 2, poster

Bibliography

Published articles

1. S. Tomić, D. Grgičin, T. Ivek, T. Vuletić, S. Dolanski Babić and R. Podgornik, Dynamics and structure of biopolyelectrolytes in repulsion regime characterized by dielectric spectroscopy, Physica B: Condensed Matter 407, 1958-1963 (2012) (download).
2. S. Tomić, D. Grgičin, T. Ivek, S. Dolanski Babić, T. Vuletić, G. Pabst and R. Podgornik, Dynamics and Structure of Biopolyelectrolytes characterized by Dielectric Spectroscopy, Macromolecular Symposia 305, 43-54 (2011) (download).
3. T. Vuletić, S. Dolanski Babić, D. Grgičin, D. Aumiler, J. Raedler, F. Livolant and S. Tomić, Manning free counterions fraction for a rod-like polyion - short DNA fragments in very low salt, Phys. Rev. E 83, 041803 (2011) (download).
4. T. Vuletić, S. Dolanski Babić, T. Ivek, D. Grgičin, S. Tomić and R. Podgornik, Structure and dynamics of hyaluronic acid semidilute solutions: a dielectric spectroscopy study, Phys. Rev. E 82, 011922 (2010) (download).
5. S. Tomić, S. Dolanski Babić, T. Ivek, T. Vuletić, S. Krča, F. Livolant and R. Podgornik, Short-fragment Na-DNA dilute aqueous solutions: fundamental length scales and screening, EPL 81, 68003 (2008) (download).
6. T. Ivek, T. Vuletić, S. Tomić, A. Akrap, H. Berger and L. Forró, Collective Charge Excitations below the Metal-to-Insulator Transition in BaVS₃, Phys. Rev. B 78, 035110 (2008) (download).
7. T. Ivek, T. Vuletić, B. Korin-Hamzić, O. Milat, S. Tomić, B. Gorshunov, M. Dressel, J. Akimitsu, Y. Sugiyama, C. Hess and B. Büchner, Crossover in charge transport from one-dimensional copper-oxygen chains to two-dimensional ladders in (La,Y)_y(Sr,Ca)_14-yCu₂₄O₄₁, Phys. Rev. B 78, 205105 (2008) (download).
8. S. Tomić, S. Dolanski-Babić, T. Vuletić, S. Krča, D. Ivanković, L. Griparić and R. Podgornik, Dielectric relaxation of DNA aqueous solutions, Phys. Rev. E 75, 021905 (2007) (download).
9. T. Vuletić, B. Korin-Hamzić, T. Ivek, S. Tomić, B. Gorshunov, M. Dressel and J. Akimitsu, The Spin-Ladder and Spin-Chain System (La,Y,Sr,Ca)₁₄Cu₂₄O₄₁: Electronic Phases, Charge and Spin Dynamics, Phys. Rep. 428, 169-258 (2006) (download).
10. S. Tomić, T. Vuletić, S. Dolanski-Babić, S. Krča, D. Ivanković, L. Griparić and R. Podgornik, Screening and Fundamental Length Scales in Semidilute Na-DNA Aqueous Solutions, Phys. Rev. Lett. 97, 098303 (2006) (download).
11. T. Vuletić, T. Ivek, B. Korin-Hamzić, S. Tomić, B. Gorshunov, P. Haas, M. Dressel, J. Akimitsu, T. Sasaki and T. Nagata, Anisotropic Charge Modulation in the Ladder Planes of Sr_14-xCa_xCu₂₄O₄₁, Phys. Rev. B 71, 012508 (2005) (download).
12. T. Vuletić, T. Ivek, B. Korin-Hamzić, S. Tomić, B. Gorshunov, M. Dressel, C. Hess, B. Büchner and J. Akimitsu, Phase diagrams of (La,Y,Sr,Ca)₁₄Cu₂₄O₄₁: switching between the ladders and the chains, J. Phys. IV France 131, 299-305 (2005) (download).
13. P. Zornoza, K. Petukhov, M. Dressel, N. Biskup, T. Vuletić and S. Tomić, Anisotropy and field-dependence of the spin-density-wave dynamics in the quasi one-dimensional conductor (TMTSF)₂PF₆, Eur. Phys. J. B 46, 223-230 (2005) (download).
14. T. Vuletić, B. Korin-Hamzić, S. Tomić, B. Gorshunov, P. Haas, M. Dressel, J. Akimitsu, T. Sasaki and T. Nagata, Variable-range hopping conductivity in the copper-oxygen chains of La₃Sr₃Ca₈Cu₂₄O₄₁, Phys. Rev. B 67, 184521 (2003) (download).
15. T. Vuletić, B. Korin-Hamzić, S. Tomić, B. Gorshunov, P. Haas, T. Rõõm, M. Dressel, J. Akimitsu and T. Nagata, Suppression of the charge-density wave state in Sr₁₄Cu₂₄O₄₁ by calcium doping, Phys. Rev. Lett. 90, 257002 (2003) (download).
16. M. Pinterić, T. Vuletić, M. Lončarić, K. Petukhov, B. Gorshunov, J. U. von Schütz, S. Tomić and M. Dressel, Mott-Peierls phase in deuterated copper-DCNQI systems: a comprehensive study of longitudinal and transverse conductivity and ageing effects, J. Phys.: Condens. Matter 15, 7351-7364 (2003) (download).
17. T. Vuletić, P. Auban-Senzier, C. Pasquier, S. Tomić, D. Jérome, M. Héritier and K. Bechgaard, Coexistence of Superconductivity and Spin Density Wave orderings in the organic superconductor (TMTSF)₂PF₆, Eur. Phys. J. B 25, 319-331 (2002) (download).
18. C. Pasquier, P. Auban-Senzier, T. Vuletic, S. Tomic, M. Héritier and D. Jérome, Coexistence of superconductivity and spin density wave orderings in Bechgaard and Fabre salts, J. Phys. IV France 12, Pr9-197 (2002) (download).
19. B. Gorshunov, P. Haas, T. Rõõm, M. Dressel, T. Vuletić, B. Korin-Hamzić, S. Tomić, J. Akimitsu and T. Nagata, Charge Density Wave formation in Sr_14-xCa_xCu₂₄O₄₁, Phys. Rev. B 66, 060508(R) (2002) (download).
20. S. Tomic, T. Vuletic, M. Pinteric and B. Korin-Hamzic, Modalities of Self-Organized Charge Response in Low Dimensional Systems, J. Phys. IV France 12, Pr9-211 (2002) (download).
21. S. Tomić, M. Pinterić, T. Vuletić, J. U. von Schütz and D. Schweitzer, Low-frequency dielectric spectroscopy of commensurate density waves, Synth. Metals 120, 695 - 698 (2001) (download).
22. T. Vuletić, M. Pinterić, M. Lončarić, S. Tomić and J. U. von Schütz, Non-ohmic electrical transport in the Peierls-Mott state of deuterated copper-DCNQI systems, Synth. Metals 120, 1001 - 1002 (2001) (download).
23. T. Vuletić, C. Pasquier, P. Auban-Senzier, S. Tomić, D. Jérome, K. Maki and K. Bechgaard, Influence of quantum Hall effect on linear and nonlinear conductivity in the FISDW states of the organic conductor (TMTSF)₂PF₆, Eur. Phys. J. B 21, 53 - 60 (2001) (download).
24. M. Pinterić, T. Vuletić, S. Tomić and J. U. von Schütz, Complex low-frequency dielectric relaxation of the charge-density wave state in the (2,5(OCH₃)₂DCNQI)₂Li, Eur. Phys. J. B 22, 335 - 341 (2001) (download).
25. M. Pinterić, T. Vuletić, M. Lončarić, S. Tomić and J. U. von Schutz, Low frequency dielectric spectroscopy of the Peierls-Mott insulating state in the deuterated copper-DCNQI systems, Eur. Phys. J. B 16, 487 - 493 (2000) (download).
26. T. Vuletic, D. Herman, N. Biskup, M. Pinteric, A. Omerzu, S. Tomic and M. Nasagawa, Single-particle and spin-density wave charge dynamics in (TMTSF)₂PF₆ And (TMTSF)₂AsF₆: A comparative overview, J. Phys. IV France 9, Pr10-275 - Pr10-277 (1999) (download).
27. N. Biškup, T. Vuletić, D. Herman, S. Tomić, M. Nagasawa and K. Bechgaard, Low Frequency Dielectric Response in Spin Density Wave Phase of Bechgaard Salts, Synth. Metals 103, 2052 - 2053 (1999) (download).

Articles in preparation

Other publications

1. Physics of Cells: from the Edge to the Heart - PhysCell 2009 / the First meeting of the European Molecular Biology Organization Conference Series on Cell Biophysics, Primošten, Croatia, September 6-13, 2009, edited by A.S. Smith, T. Vuletić, K. Sengupta, L. Limozin, L. Vonna, T. Franosch (Institut za fiziku, Zagreb, 2009) - Book of Abstracts.