Coherent Particle Transfer in an On-Demand Single-Electron Source

Details Coherent Particle Transfer in an On-Demand Single-Electron Source Coherent Particle Transfer in an On-Demand Single-Electron Source

2008-04-27

arxiv.org/abs/0804.4281v2

Phys. Rev. Lett. 101, 196404 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures. Updated introduction, Fig. 1, and references

Scientific paper

10.1103/PhysRevLett.101.196404

Coherent electron transfer from a localized state trapped in a quantum dot into a ballistic conductor, taking place in on-demand electron sources, in general may result in excitation of particle-hole pairs. We consider a simple model for these effects, involving a resonance level with time-dependent energy, and derive Floquet scattering matrix describing inelastic transitions of particles in the Fermi sea. We find that, as the resonance level is driven through the Fermi level, particle transfer may take place completely without particle-hole excitations for certain driving protocols. In particular, such noiseless transfer occurs when the level moves with constant rapidity, its energy changing linearly with time. A detection scheme for studying the coherence of particle transfer is proposed.

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