Seminar über aktuelle Fragen zur Dynamik komplexer Fluide: Confined blue phases with half-skyrmion structures

Seminar über aktuelle Fragen zur Dynamik komplexer Fluide

  • Date: Nov 10, 2017
  • Time: 10:15 AM - 11:15 AM (Local Time Germany)
  • Speaker: Prof. Dr. Slobodan Žumer
  • University of Ljubljana & Jozef Stefan Institute, Ljubljana, Slovenia
  • Location: Max-Planck-Institut für Dynamik und Selbstorganisation (MPIDS)
  • Room: SR 0.77
  • Host: MPIDS/DCF
  • Contact:
Liquid crystalline blue phases are highly chiral nematic liquids that confined to thin layers exhibit numerous exotic structures. Modeling based on phenomenological free energy show that stable nematic orientational ordering fields are characterized by 2D lattices consisting of singular disclination lines and nonsingular double twisted solitonic structures that could be also partially entangled [1,2]. In analogy to reported skyrmion defects and lattices in thin layers of chiral magnets [3] we have few years ago predicted also a hexagonal lattice of half-skyrmions in thin layers of blue phases [4]. Full skyrmions were recently realized [5] and described [6] in unwound cholesteric liquid crystals in thin layers. In more details, I will here describe the half-skyrmion lattice and individual half-skyrmions recently realized in thin blue phase layers [7].

[1] J. Fukuda & S. Žumer, Novel defect structures in a strongly confined liquid-crystalline blue phase. PRL 104, 017801 (2010).
[2] J. Fukuda & S. Žumer, Ring Defects in a Strongly Confined Chiral Liquid Crystal, PRL 106, 097801 (2011).
[3] U.K. Rößler, A. N. Bogdanov, & C. Pfleiderer, Spontaneous skyrmion ground states in magnetic metals. Nature 442, 797 (2006).
[4] J. Fukuda and S. Žumer, Quasi-two-dimensional Skyrmion lattices in a chiral nematic liquid crystal, Nature Comm. 2, 246 (2011).
[5] P. J. Ackerman, R. P. Trivedi, B. Senyuk, J. van de Lagemaat, & I. I. Smalyukh, Two-dimensional skyrmions and other solitonic structures in confinement-frustrated chiral nematics, PRE 90, 012505 (2014).
[6] A.O. Leonov, I.E. Dragunov, U.K. Rößler and A.N. Bogdanov, Theory of skyrmion states in liquid crystals, PRE 90, 042502 (2014).
[7] A. Nych, J. Fukuda, U. Ognysta, S. Žumer, and I. Muševič, Spontaneous formation and dynamics of half-skyrmions in a chiral liquid-crystal film, Nature physics, DOI: 10.1038/NPHYS4245 (2017).
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