Journal Article

PreJuSER-5815

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Pumping of vibrational excitations in a Coulomb blockaded suspended carbon nanotube

Huettel, A. K. ; Witkamp, B. ; Leijnse, M. ; Wegewijs, M. R.FZJ* ; van der Zant, H. S. J.

2009
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/7209  doi:10.1103/PhysRevLett.102.225501

Abstract: Low-temperature transport spectroscopy measurements on a suspended few-hole carbon nanotube quantum dot are presented, showing a gate-dependent harmonic excitation spectrum which, strikingly, occurs in the Coulomb-blockade regime. The quantized excitation energy corresponds to the scale expected for longitudinal vibrations of the nanotube. The electronic transport processes are identified as cotunnel-assisted sequential tunneling, resulting from nonequilibrium occupation of the mechanical mode. They appear only above a high-bias threshold at the scale of electronic nanotube excitations. We discuss models for the pumping process that explain the enhancement of the nonequilibrium occupation and show that it is connected to a subtle interplay between electronic and vibrational degrees of freedom.

Keyword(s): J

Note: The authors would like to thank Y. Blanter and M. Poot for insightful discussions, and B. Otte and H. Pathangi for experimental help. Financial support by the Dutch organization for Fundamental Research on Matter (FOM), the NWO VICI program, NanoNed, DFG SPP-1243, the Helmholtz Foundation, and the FZ-Julich (IFMIT) is acknowledged.

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Contributing Institute(s):

1. Theorie der Strukturbildung (IFF-3)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2009

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