Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 10: Focus Session: Single Particle Sources for Electronic Devices I
(Joint session of HL and TT organized by HL)

TT 10.1: Hauptvortrag

Montag, 7. März 2016, 11:30–12:00, H10

A clean single electron source using voltage pulses generating levitons. — •Christian Glattli — Nanoelectronics Group, Service de Physique de l'État Condensé CEA-Saclay, 91191 Gif-sur-Yvette, France

A simple approach to realize an on-demand electron soource is to apply a voltage pulse on a contact of the conductor such that the resulting current pulse injects a single charge in the conductor. At first sight, the idea seems too naive to produce something useful. However it appears that this procedure perfectly works [1]. More surprisingly it contains a rich physics: the generation of a new kind of excitation carrying a single particle: a leviton. The method was theoretically considered 20 years ago by L. Levitov and collaborators [2] who found that a voltage pulse with Lorentzian shape produces a minimal excitation, i.e. such that the number of excitations generated is not larger than the number of injected charges.

In this talk, I will present the recent experimental generation of levitons. I will also show electron quantum optics applications, reporting a two-leviton quantum interference experiment, the electrical analog of the Hong Ou Mandel experiment with photons which reveal perfect electron coherence. Finally using electron quantum tomography [3] an almost complete picture of the Leviton wave-function can be experimentally given.

[1] J. Dubois et al, Nature 502, 659-663 (2013).

[2] Levitov et al., J. Math. Phys. 37, 4845*4856 (1996).

[3] T. Jullien et al., Nature 514, 603*607 (2014)