[seminar] SEMINAR na IF-u u UTORAK, 14. 09. 2010.

[Berislav Horvatic]

      Institut za fiziku, Bijenička cesta 46,

      predavaonica u zgradi Mladen Paić

      utorak, 14. rujna 2010, u 15:00 sati

       
     
      NMR study of the Tomonaga-Luttinger

      liquid state in the carbon nanotubes

       
     
      Dr. Pawel Wzietek
     
       

      Laboratoire de Physique des Solides, bât. 510,

      Université Paris-Sud, 91405 Orsay, France

       

      E-mail: wzietek at lps.u-psud.fr

       
     
      Carbon nanotubes (CNT) are perfect candidates to realize 1D electronic systems, such as described by the Tomonaga-Luttinger Liquid theory. Although the TLL behavior in the electronic transport was reported for metallic CNT, conductivity measurements can be spoiled by contact effects such as the Coulomb blocade. On the other hand, NMR provides a noninvasive probe of the electronic properties of a bulk system such as CNT bundles. I will present 13C NMR studies of the single- and double-wall nanotubes. The experiments on isotopically engineered double-wall nanotubes have enabled us to show that the inner-wall tubes can become metallic due to the charge transfer between the tubes. In the single-wall species (SWCNT) the nuclear relaxation study reveals that spin excitations are gapless down to at least 6K and a power law behavior of 1/T1 characteristic of a TLL could be followed over two decades in temperature. This is probably the best realization of a TLL state up to date. However the observed exponent cannot be explained within the framework of the two-band TLL model commonly used to describe the metallic CNT.

      http://www.lps.u-psud.fr/Collectif/gr_21/ENG/default_en.htm

       
     
      Voditelji seminara IF-a:  Berislav Horvatić  &  Ivica Živković
     
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