Disorder-mediated electron valley resonance in carbon nanotube quantum dots

Details Disorder-mediated electron valley resonance in carbon nanotube quantum dots Disorder-mediated electron valley resonance in carbon nanotube quantum dots

2010-10-20

arxiv.org/abs/1010.4338v1

Phys. Rev. Lett. 106, 086801 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.106.086801

We propose a scheme for coherent rotation of the valley isospin of a single electron confined in a carbon nanotube quantum dot. The scheme exploits the ubiquitous atomic disorder of the nanotube crystal lattice, which induces time-dependent valley mixing as the confined electron is pushed back and forth along the nanotube axis by an applied ac electric field. Using experimentally determined values for the disorder strength we estimate that valley Rabi oscillations with a period on the nanosecond timescale are feasible. The valley resonance effect can be detected in the electric current through a double quantum dot in the single-electron transport regime.

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