Hüttel, Andreas K. and Witkamp, Benoit and Leijnse, Martin and Wegewijs, Maarten R. and van der Zant, Herre S. J. (2009) Pumping of Vibrational Excitations in the Coulomb-blockade Regime in a Suspended Carbon Nanotube. Physical Review Letters 102, p. 225501.
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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.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Christoph Strunk|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||No|
|Owner:||Dr. Andreas K. Hüttel|
|Deposited On:||15 Jun 2009 14:59|
|Last Modified:||05 Aug 2009 15:58|
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