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Tomonaga-Luttinger liquids and Coulomb blockade in multiwall carbon nanotubes under pressure

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arxiv cond-mat/0609690 v1 pith:PYQN6VJZ submitted 2006-09-27 cond-mat.mes-hall cond-mat.str-el

M. Monteverde , M.Nunez-Regueiro , G. Garbarino , C. Acha , X. Jing , L. Lu , Z.W. Pan , S. S. Xie
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J. Souletie R. Egger
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classification cond-mat.mes-hallcond-mat.str-el
keywords blockadecoulomblawsliquidsmultiwallmwntpowerpressure
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We report that the conductance of macroscopic multiwall nanotube (MWNT) bundles under pressure shows power laws in temperature and voltage, as corresponding to a network of bulk-bulk connected Tomonaga-Luttinger Liquids (LL). Contrary to individual MWNT, where the observed power laws are attributed to Coulomb blockade, the measured ratio for the end and bulk obtained exponents, ~2.4, can only be accounted for by LL theory. At temperatures characteristic of interband separation, it increases due to thermal population of the conducting sheets unoccupied bands.

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