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Time-Dependent Transport in Aharonov-Bohm Interferometers | | V. Kotimaki
; E. Cicek
; A. Siddiki
; E. Rasanen
; | | Date: |
28 Oct 2010 | | Abstract: | A comprehensive numerical scheme is employed to explain transport
characteristics in realistic, quantum Hall based Aharonov-Bohm interferometers.
First, the spatial distribution of incompressible strips, and thus the current
channels, is obtained applying a self-consistent Thomas-Fermi method to a
realistic heterostructure under quantized Hall conditions. Second, the
time-dependent Schr"odinger equation is solved for electrons injected in the
current channels. Distinctive Aharonov-Bohm oscillations are found as a
function of the magnetic flux. The oscillation amplitude strongly depends on
the mutual distance between the transport channels and on their width. At an
optimal distance the amplitude and thus the interchannel transport is
maximized, which determines the maximum visibility condition. On the other
hand, the transport is fully suppressed at magnetic fields corresponding to
half-integer flux quanta. The results confirm the applicability of realistic
Aharonov-Bohm interferometers as controllable current switches. | | Source: | arXiv, 1010.5894 | | Services: | Forum | Review | PDF | Favorites | |
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