Nonlocal interference and Hong-Ou-Mandel collisions of single Bogoliubov quasiparticles

Abstract : We consider a device which allows one to create and probe single Majorana fermions, in the form of Bogoliubov quasiparticles. It is composed of two counterpropagating edge channels, each put in proximity with a superconducting region where Andreev reflection operates, and which thus converts electrons into Bogoliubov quasiparticles. The edge channels then meet at a quantum point contact where collisions can be achieved. A voltage-biased version of the setup was studied [C. W. J. Beenakker, Phys. Rev. Lett. 112, 070604 (2014)] and showed nonlocal interference phenomena and signatures of Bogoliubov quasiparticle collisions in the high-frequency noise characteristics at the output, constituting an evidence of the Majorana fermion nature of these excitations. Here, voltage-biased leads are replaced by single-electron sources in order to achieve collisions of single Bogoliubov quasiparticles, with the major advantage that zero-frequency noise measurements are sufficient to access the intimate nature of Bogoliubov wave packets. We compute the injection parameters of the source, and go on to investigate the Hanbury-Brown and Twiss and Hong-Ou-Mandel signal at the output, as a function of the mixing angle which controls the electron/hole component of the Bogoliubov wave packet. In particular, information on the internal structure of the Bogoliubov quasiparticle can be recovered when such a quasiparticle collides with a pure electron. Experimental feasibility with singlet or triplet superconductors is discussed.
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Contributor : Thibaut Jonckheere <>
Submitted on : Wednesday, November 25, 2015 - 4:34:51 PM
Last modification on : Sunday, December 23, 2018 - 11:42:01 AM

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Dario Ferraro, J. Rech, T. Jonckheere, T. Martin. Nonlocal interference and Hong-Ou-Mandel collisions of single Bogoliubov quasiparticles. Physical Review B : Condensed matter and materials physics, American Physical Society, 2015, 91, pp.075406. ⟨http://journals.aps.org/prb/pdf/10.1103/PhysRevB.91.075406⟩. ⟨10.1103/PhysRevB.91.075406⟩. ⟨hal-01233726⟩

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