VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Tuesday 6
Quantum electronics, quantum information, electronic quantum optics, high frequency noise

› 15:00 - 15:30 (30min)
Fermi-Edge Singularity in Single Electron Generation
Takeo Kato  1@  , Eiki Iyoda  2@  
1 : ISSP, The University of Tokyo  -  Website
5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581 -  Japan
2 : Graduate School of Science, Tohoku University  -  Website
2-1-1 Katahira, Aoba-ku, Sendai, 980-8577 -  Japan

Realization of on-demand single electron source has enabled us to access a new type of experiments using a few coherent electrons. This novel type of experiments can be recognized as a fermionic counterpart of quantum optics, which is based on experiments useing a few bosonic particles, i.e., photons. A fermionic counterpart of the Hong-Ou-Mandel experiment has been considered theoretically in a setup of a two-electron collider. In these theoretical proposals, however, Coulomb interaction between electrons has completely been neglected. 

In this talk, we discuss decoherence of an injected electron induced by Coulomb interaction between an electron in a dot and electrons in a chiral edge channel. The model we consider is essentially the same as that for the Fermi- edge singularity problem in X-ray absorption experiments, where electron-hole excitations with infinitesimal energies play an essential role. We treat this many-body problem with a diagrammatic perturbation method in the framework of the Keldysh Green's function. We calculate a density matrix of an injected electron as a function of strength of Coulomb repulsion, and discuss excess noise in two-particle collision experiments, which characterize anti-bunching phenomenon inherent in fermions. 

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