Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Focus Session: Single Particle Sources for Electronic Devices II
(Joint session of HL and TT organized by HL)
TT 11.5: Hauptvortrag
Montag, 7. März 2016, 16:45–17:15, H10
Electronic states in a driven quantum contact — •Mihajlo Vanevic1, Julien Gabelli2, Wolfgang Belzig3, and Bertrand Reulet4 — 1Department of Physics, University of Belgrade, Serbia — 2Laboratoire de Physique des Solides, Univ. Paris-Sud, France — 3Fachbereich Physik, Universität Konstanz, Germany — 4Département de physique, Université de Sherbrooke, Canada
Minimal excitations in a voltage-driven quantum conductor are electrons excited above the Fermi level. Generation of these minimal excitation states requires carefully tailored Lorentzian voltage pulses carrying an integer number of charge quanta. However, a general time-dependent voltage excites both electrons and electron-hole pairs whose number and probability of creation depend on the shape and the amplitude of the drive. We have studied the many-body electronic state created by a general voltage drive and expressed it manifestly in terms of single-electron and electron-hole quasiparticle excitations. We have confirmed our theoretical predictions by probing the constituent quasiparticle states in a Hong-Ou-Mandel-type experiment on a tunnel junction. The knowledge of the many-body state opens a way of engineering the required time profile or energy distribution of single-electron and electron-hole excitations. Harmonic drive with ac amplitude smaller than dc voltage offset can be used to create single-electron states with a small admixture of electron-hole pairs.