Zerobias anomaly in twodimensional electron layers and multiwall nanotubes
Abstract
The zerobias anomaly in the dependence of the tunneling density of states ν(ɛ) on the energy ɛ of the tunneling particle for two and onedimensional multilayered structures is studied. We show that for a ballistic twodimensional (2D) system the firstorder interaction correction to density of states due to the plasmon excitations studied by Khveshchenko and Reizer is partly compensated by the contribution of electronhole pairs, which is twice as small and has the opposite sign. For multilayered systems the total correction to the density of states near the Fermi energy has the form δν/ν_{0}=max(\ɛ\,ɛ^{*})/ 4ɛ_{F}, where ɛ^{*} is the plasmon energy gap of the multilayered 2D system. For a 2D system with finiterange interaction the particlehole contribution precisely cancels with the contribution of the zerosound mode, in agreement with the Fermi liquid theory. In the case of onedimensional conductors we study multiwall nanotubes with the elastic mean free path exceeding the radius of the nanotube. The dependence of the tunneling densityofstates energy, temperature and on the number of shells is found.
 Publication:

Physical Review B
 Pub Date:
 June 2002
 DOI:
 10.1103/PhysRevB.65.235310
 arXiv:
 arXiv:condmat/0110065
 Bibcode:
 2002PhRvB..65w5310M
 Keywords:

 73.63.b;
 73.21.Ac;
 73.21.Hb;
 73.23.Hk;
 Electronic transport in nanoscale materials and structures;
 Multilayers;
 Quantum wires;
 Coulomb blockade;
 singleelectron tunneling;
 Condensed Matter  Mesoscopic Systems and Quantum Hall Effect;
 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 8 pages, 3 figures