Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Transport: Quantum Dots, Quantum Wires, Point Contacts II (TT jointly with O)
O 21.4: Vortrag
Montag, 31. März 2014, 17:00–17:15, HSZ 204
Entanglement detection in an interacting beam-splitter device — •Alexander Schroer1, Bernd Braunecker2, Alfredo Levy Yeyati3, and Patrik Recher1 — 1Institute for Mathematical Physics, TU Braunschweig, Germany — 2Department of Theoretical Condensed Matter Physics, Universidad Autónoma de Madrid, Spain — 3School of Physics & Astronomy, University of St Andrews, UK
We investigate a tunnel contact between two Luttinger liquids, e.g. realized as two crossed one-dimensional nanowires. When injecting one of two electrons with opposite spin in each wire, the current measured behind the crossing differs for singlet, triplet or product states. This is an apparent non-Fermi liquid feature because the current has been shown to be independent of spin-entanglement for Fermi liquid beam-splitters before. It can be understood in terms of collective excitations and by taking spin-charge separation into account. This behavior may offer an easier alternative to traditional entanglement detection schemes based on current noise, which turns out to be suppressed by the electron-electron interaction.