Huettel, A. K. and Witkamp, B. and Leijnse, M. and Wegewijs, M. R. and van der Zant, H. S. J. (2009) Pumping of Vibrational Excitations in the Coulomb-Blockade Regime in a Suspended Carbon Nanotube. PHYSICAL REVIEW LETTERS, 102 (22): 225501. ISSN 0031-9007,
Full text not available from this repository. (Request a copy)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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM-DOT; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Andreas K. Hüttel |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Sep 2020 08:26 |
| Last Modified: | 14 Sep 2020 08:26 |
| URI: | https://pred.uni-regensburg.de/id/eprint/28828 |
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