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Thursday, August 14 • 08:30 - 10:30
Transport in Heterostructures IV

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8:30-9:00

Invited: Vincent Freulon
Decoherence in an Electronic Hong-Ou-Mandel Interferometer
Co-authors: Arthur Marguerite, Bernard Plaçais, Jean-Marc Berroir, Gwendal Fève, Yong Jin, Antonella Cavana

Electron-photon analogies in quantum conductors enable to investigate the coherence of single electronic excitations in electron quantum optic systems. I will present experiments performed on the electronic analog of the Hong-Ou-Mandel interferometer [1]. Two independent sources are used to inject single electrons in the outer edge channel of a two dimensional electron gas in the integer quantum Hall regime. Using an electronic beam splitter, we observe two-particle interferences resulting from quantum exchange statistics.

When both particles are emitted in indistinguishable wavepackets with synchronized arrival time on the splitter, they exit in different outputs. Experimentally, this effect is revealed by a reduction (dip) of the low frequency noise of the output current. Remarquably, dip depth depends on the temporal width of the emitted wavepackets and almost vanishes at long widths. This is a signature of decoherence along the propagation length between source and splitter, involving the coupling between the outer edge channel and the inner ones. We observe that this coupling is modified by changing the filling factor. Our results are compared with a theoretical model of decoherence induced by interchannel interactions [2].

[1] Coherence and Indistinguishability of Single Electrons Emitted by Independent Sources, Bocquillon et al., Science 339,1054 (2013).
[2] Interactions and charge fractionalization in an electronic Hong-Ou-Mandel interferometer, Wahl et al., arXiv:1307.5257 (2014).

9:00-9:15
Oral: Niels Ubbelohde
On-Demand Generation & Separation of Electron Pairs in a Beam Splitter Device
Co-authors: Frank Hohls, Vyacheslavs Kashcheyevs, Timo Wagner, Lukas Fricke, Bernd Kaestner, Klaus Pierz, Hans W. Schumacher, Rolf J. Haug

9:15-9:30
Oral: Richard Steinacher
Guiding Branched Electron Flow & Interference Effects in a Cavity of Variable Size
Co-authors: Aleksey Kozikov, Clemens Roessler, Christian Reichl, Werner Wegscheider, Thomas Ihn, Klaus Ensslin

9:30-9:45
Oral: Clemens Roessler
Sub-Thermal Electron Transfer in Semiconductor Quantum Structures
Co-authors: Christian Reichl, Werner Wegscheider, Thomas Ihn, Klaus Ensslin

9:45-10:00
Oral: Ramesh Mani
Oscillatory Magnetotransport in the High Mobility GaAs/AlGaAs System under Microwave Irradiation: Role of Microwave Polarization
Co-authors: Aruna Ramanayaka, Werner Wegscheider

10:00-10:15
Oral: Vincent Sacksteder
Spin Dynamics of Cavity Polaritons Diffusing in a Magnetic Field
Co-authors: Anastasia Pervishko, Ivan Shelykh

10:15-10:30
Oral: Yasufumi Araki
Weak Anti-Localization Behavior Beyond Band-Unresolved Regime by Tuning Rashba Spin-Orbit Coupling 
Co-authors: Guru Khalsa, Allan H. MacDonald 

Session Chairs
AC

Andrés Cantarero

University of Valencia

Speakers
VF

Vincent Freulon

Laboratoire Pierre Aigrain


Thursday August 14, 2014 08:30 - 10:30
Room 17A

Attendees (9)