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Lecture Patrik Recher


13 February 2008 FWN-Building 5116.0116, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Patrik Recher
Affiliation: University of Leiden
Title: Correspondence between Andreev reflection and Klein tunneling in bipolar graphene
Date: Wed Feb 13, 2008
Start: 15.00
Location: FWN-Building 5116.0116
Host: Bart van Wees
Telephone: +31 50 363 4933


Andreev reflection at a superconductor and Klein tunneling through an n-p junction in graphene are two processes that couple electrons to holes -- the former through the superconducting pair potential Delta and the latter through the electrostatic potential U. We derive that the energy spectra in the two systems are identical, at low energies E<<Delta and for an antisymmetric potential profile U(-x,y)=-U(x,y). This correspondence implies that bipolar junctions in graphene may have zero density of states at the Fermi level and carry a current in equilibrium, nalogously to superconducting Josephson junctions.

Last modified:22 October 2012 2.31 p.m.