Competition between h/e and h/2e oscillations in a semiconductor Aharonov-Bohm interferometer


Mur, L.C. and Harmans, C.J.P.M. and Wiel, W.G. van der (2008) Competition between h/e and h/2e oscillations in a semiconductor Aharonov-Bohm interferometer. New Journal of Physics, 10 . 073031. ISSN 1367-2630

open access
[img] PDF
Abstract:The magnetoresistance of a quasi-ballistic Aharonov-Bohm (AB) ring defined in the two-dimensional electron gas (2DEG) of an InP/In0.8Ga0.2As quantum well is studied. The ring is connected to an Al contact on one side and to a 2DEG reservoir at the other side. Two distinct magnetic field regimes can be identified. At magnetic field values where time-reversal symmetry (TRS) is broken, AB oscillations are observed. Besides oscillations with h/e periodicity, we also observe higher harmonics with h/2e and h/3e periods. In the low-magnetic field range, where TRS is preserved, the AB oscillations are alternately dominated by the h/e or h/2e component, depending on the bias voltage. Although Al is superconducting at these low magnetic fields, no evidence is found that the observed AB oscillations are related to the proximity of the superconductor. The bias voltage dependence is qualitatively described in terms of a 1D scattering model.
Item Type:Article
Additional information:Open access article
Copyright:© 2008 IOP Publishing and Deutsche Physikalische Gesellschaft
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:
Official URL:
Export this item as:BibTeX
HTML Citation
Reference Manager


Repository Staff Only: item control page

Metis ID: 252066