Volume 93, Number 6, March 2011
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 March 2011|
Focused crossed Andreev reflection
Department of Physics, Norwegian University of Science and Technology - N-7491 Trondheim, Norway
2 SPSMS-INAC-CEA - 17 rue des Martyrs, 38054 Grenoble CEDEX 9, France, EU
3 Kavli Institute of NanoScience, Delft University of Technology - 2628 CJ Delft, The Netherlands, EU
4 Institute for Materials Research, Tohoku University - Sendai 980-8577, Japan
Accepted: 21 February 2011
We consider non-local transport mediated by Andreev reflection in a two-dimensional electron gas (2DEG) connected to one superconducting and two normal metal terminals. A robust scheme is presented for observing crossed Andreev reflection (CAR) between the normal metal terminals based on electron focusing by weak perpendicular magnetic fields. At slightly elevated temperatures the CAR signature can be easily distinguished from a background of quantum interference fluctuations. The CAR-induced entanglement between electrons can be switched on and off over large distances by the magnetic field.
PACS: 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 73.23.-b – Electronic transport in mesoscopic systems
© EPLA, 2011
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