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Modulation of Luttinger liquid exponents in multiwalled carbon nanotubes

AutorBellucci, S.; González Carmona, José ; Onorato, P.; Perfetto, E.
Fecha de publicación26-jul-2006
EditorAmerican Physical Society
CitaciónPhysical Review B - Condensed Matter and Materials Physics 74: 045427 (2006)
ResumenWe develop in this paper a theoretical framework that applies to the intermediate regime between the Coulomb blockade and the Luttinger liquid behavior in multiwalled carbon nanotubes. Our main goal is to confront the experimental observations of transport properties, under conditions in which the thermal energy is comparable to the spacing between the single-particle levels. For this purpose we have devised a many-body approach to the one-dimensional electron system, incorporating the effects of a discrete spectrum. We show that, in the crossover regime, the tunneling conductance follows a power-law behavior as a function of the temperature, with an exponent that oscillates with the gate voltage as observed in the experiments. Also in agreement with the experimental observations, a distinctive feature of our approach is the existence of an inflection point in the log-log plots of the conductance vs temperature, at gate voltages corresponding to peaks in the oscillation of the exponent. Moreover, we evaluate the effects of a transverse magnetic field on the transport properties of the multiwalled nanotubes. For fields of the order of 4 T, we find changes in the band structure that may be already significant for the outer shells, leading to an appreciable variation in the power-law behavior of the conductance. We then foresee the appearance of sizeable modulations in the exponent of the conductance for higher magnetic fields, as the different subbands are shifted towards the development of flat Landau levels. © 2006 The American Physical Society.
Descripción8 págs.; 7 figs. ; PACS number s : 73.63.Fg, 73.22. f, 73.23. b
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.74.045427
URIhttp://hdl.handle.net/10261/140404
DOI10.1103/PhysRevB.74.045427
Identificadoresdoi: 10.1103/PhysRevB.74.045427
issn: 1098-0121
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