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kibble_small.jpg29. 12. 2014
Light control over topological charge in nematic liquid crystals

Authors M. Nikkhou, M. Škarabot, S. Čopar, M. Ravnik, S. Žumer and I. Muševič from Jožef Stefan Institute and Faculty of Mathematics and Physics (FMP), University of Ljubljana, have just reported on the discovery of light-control of the topological charge in the system of confined nematic liquid crystals. In the paper Light-controlled topological charge in a nematic liquid crystal, just published in the journal Nature Physics, they demonstrate that the confinement of space, specifically with microscopic colloidal fibres, affects the later stages of the Kibble-Zurek mechanism which allows for trapping and control of topological defect loops with different values of the topological charge. By using laser tweezers, they show that the dynamics of topologically charged objects can be well manipulated, including processes of repulsion and annihilation. The structure of ordering fields and the annihilation dynamics were determined also with intensive numerical modelling, using computer clusters which run at FMP. More generally, the demonstrated research reveals the sensitivity of the Kibble-Zurek mechanism on the connectedness of space and symmetry-breaking boundary conditions and further provides a new insight into key topological invariants of general topologically conditioned ordering fields.
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Seminar for history of mathematical sciences 9. marca 2015 Seminar iz zgodovine matematičnih znanosti odpade.
Complex analysis seminar Luka Boc Thaler: Rekonstrukcijski izrek za kompleksne polinome Torek, 10.03.2015 ob 12:30, soba 3.06 na Jadranski 21
Monday physics colloquium Dr. Bertram Arbesser-Rastburg: 50 Year of Space Activities in Europe using Microwaves IZJEMOMA V SREDO, 11. marec 2015, ob 16:15 v predavalnici F1, FMF UL, Jadranska 19, Ljubljana
Graph theory and algorithms seminar Sergio Cabello: Interval selection in the streaming model, I. Četrtek 5. marec 2015 ob 12:15 v PS na Jadranski 19
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COST Workshop on Modelling of Flowing Matter
16 - 18 February, Faculty of Mathematics and Physics, University of Ljubljana, Slovenia
http://flowing-matter2015.fmf.uni-lj.si/ 

 

Physics of Complex Colloids
14 - 18 May 2013, Cankarjev dom, Ljubljana
http://www.comploids2013.si

 

Workshop on assembling of superstructures in soft matter
11 - 13 October 2012, Klub Cankarjevega doma, Cankarjev dom, Ljubljana
http://www.softmatter.si/hierarchy2012/  

 

SLONANO 2012
24 - 26 October 2012, "Jožef Stefan" Institute
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Relativistic Positioning Systems and their Scientific Applications 
19 - 21 September 2012, Brdo pri Kranju, Slovenija
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Ljubljana Physics Summit 2012
March 3, 2012, "Jožef Stefan" Institute
http://www.physics-summit.com

 

COINAPO Topical Meeting:
Composites of nanotubes and polymers:
joining theoretical modeling with experimental investigations
8 - 9 December 2011, Ljubljana, Slovenija
http://www.fmf.uni-lj.si/si/raziskave/coinapo-meeting/

  

Physics in Ljubljana
17 - 24 July 2011, Ljubljana, Slovenia
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Confined Liquid Crystals: Landmarks and Perspectives

19 - 20 July 2010, Ljubljana, Slovenija
http://clc.fmf.uni-lj.si

 

SLONANO 2009
19 - 21 October 2009, National Institute of Chemistry, Ljubljana, Slovenija
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ESF Research Conferences
Self-assembly of guanosine derivatives: from biological systems to nanotechnological applications
20 - 25 June 2009, Obergurgl, Austria
http://www.esf.org/activities/esf-conferences/details/2009/confdetail289.html?conf=289&year=2009

 

4th European school in Material Sciences
Mechanical Properties of Complex Metallic Alloys
25 - 30 May 2009, MONS Hotel and Congress Centre, Ljubljana, Slovenija
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ESF Workshop
Towards single-spin physics
November 30, 2007, MONS Congress Center (Ravnikar room), Ljubljana, Slovenija
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7th European Symposium for the Protection of the Night Sky
Light Pollution and Global Warming
International Exhibition: Quality Lighting and Light Pollution
5 - 6 October 2007, Bled, Slovenija
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International Liquid Crystal Elastomer Conference
27 - 29 September 2007, Ljubljana, Slovenija
ilcec2007.fiz.uni-lj.si/

 

Fundamentals of Nanoelectronics
2 - 7 September 2007, Portorož, Slovenija
www-f1.ijs.si/portoroz07/