Breathing mode in open-orbit magnetotransport
A magnetic lens with a quantum mechanical focal length
D. O. Oriekhov (Universiteit Leiden)
T. T. Osterholt (Universiteit Leiden)
T. Vakhtel (Universiteit Leiden)
A. R. Akhmerov (Kavli institute of nanoscience Delft, TU Delft - QN/Akhmerov Group)
C. W.J. Beenakker (Universiteit Leiden)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
We consider the propagation of electrons in a lattice with an anisotropic dispersion in the x-y plane (lattice constant a), such that it supports open orbits along the x axis in an out-of-plane magnetic field B. We show that a point source excites a "breathing mode,"a state that periodically spreads out and refocuses after having propagated over a distance ?=(eaB/h)-1 in the x direction. Unlike known magnetic focusing effects, governed by the classical cyclotron radius, this is an intrinsically quantum mechanical effect with a focal length.