Prof. Markovich Gil

  
Affiliation:School of chemistry
Tel:  (972)-3-6406985
 
Fax: (972)-3-6405911
 
Email: gilmar@tau.ac.il
 
Personal Website:

 
Postal Address:School of chemistry
Tel Aviv University
Tel Aviv 69978

Research Interest

Synthesis and Physical Studies of Colloidal Nanostructures and their Assemblies
The group uses various colloidal chemistry methods to prepare oxide nanocrystals, mostly magnetic, and study their magnetic and magneto-resistive properties, as well as various types of metal nanostructures. The group uses spin polarized transport in magnetite nanocrystal arrays to probe the magnetization dynamics in such a strongly interacting dipolar system close to the magnetization freezing transition. This is done both on a single particle level in a variable temperature scanning tunneling microscope and in nanoscale solid state devices, in collaboration with the Majetich group from Carnegie Mellon University. Another aspect of the work on magnetism in nanocrystals is a search for defect induced ferromagnetism, which was theoretically predicted for diamagnetic oxides like magnesium oxide. The colloidal syntheses, done at relatively low temperatures are good candidates for trapping high defect concentrations in metal oxide nanocrystals.
A study on nanoscale ferroelectricity in BaTiO3 nanocubes aims at achieving better understanding of the electric polarization in nano-ferroelectrics, the importance of the surface and magnitude of electric fields within the nanocrystals. The major technique used for this study is electron holography, in collaboration with the Lichte group from Dresden University.
In another project, a wet self-assembly chemistry technique is used for the growth of ultrathin metallic nanowire films on surfaces. These films act as highly transparent and conductive electrodes and will be explored for application in photovoltaic cells.
The combination of chirality and nanostructure is being explored in various directions: 1. Induction of strong chirality in metal nanostructures by various chiral templates, such as DNA, in collaboration with the Kotlyar group from the Biochemistry department at TAU. 2. Enhancement of circular dichroism in chiral (bio) molecules using plasmonic nanostructures.

Selected Publications


  • E. Tirosh, B. Tsukerman, N. Taub, S. A. Majetich, G. Markovich, "Magnetoresistive telegraph noise in Langmuir-Blodgett films of colloidal magnetite nanocrystals probed by scanning tunneling microscopy", Phys. Rev. B 80, 224427 (2009).
  • D. Azulai, T. Belenkova, H. Gilon, Z. Barkay, G. Markovich, "Transparent metal nanowire thin films prepared in mesostructured templates", Nano Lett. 9, 4246-4249 (2009).
  • I. Lieberman, G. Shemer, T. Fried, E. M. Kosower, G. Markovich, “Plasmon Resonance Enhanced Absorption and Circular Dichroism” Angew. Chem. Int. Ed. 47, 4855-4857 (2008).
  • E. Tirosh, G. Markovich, "Control of Defects and Magnetic Properties in Colloidal HfO2 Nanorods", Adv. Mater. 19, 2608 (2007).
  • G. Shemer, O. Krichevski, G. Markovich, T. Molotsky, I. Lubitz, A. B. Kotlyar, "Chirality of Silver Nanoparticles Synthesized on DNA", J. Am. Chem Soc. 128, 11006 (2006).
  • P. Poddar, T. Fried and G. Markovich,, "First-Order Metal-Insulator Transition and Spin-Polarized Tunneling in Fe3O4 Nanocrystals", Phys. Rev. B 65, 172405 (2002).
  • T. Fried, G. Shemer, and G. Markovich, "Ordered Two-Dimensional Arrays of Ferrite Nanoparticles", Adv. Mater. 13, 1158-61 (2001).