Hydrodynamic effects in interacting Fermi electron jets

Details Hydrodynamic effects in interacting Fermi electron jets Hydrodynamic effects in interacting Fermi electron jets

2003-12-08

arxiv.org/abs/cond-mat/0312187v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 4 figures; accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.92.026803

We theoretically study hydrodynamic phenomena originating from electron-electron collisions in a two-dimensional Fermi system. We demonstrate that an electron beam sweeping past an aperture creates a pumping effect, attracting carriers from this aperture. This pumping effect originates from the specific electric potential distribution induced by the injected electrons. In the regions nearby the main stream of injected electrons, a positive potential is induced by the injected electrons. Thus, the normally repulsive Coulomb interaction leads to an attractive force in the Fermi system. This quantum pumping mechanism in a Fermi system differs qualitatively from the Bernoulli pumping effect in classical liquids. We also discuss possible experimental realizations.

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