Non-local Aharonov-Bohm conductance oscillations in an asymmetric quan-tum ring

Details Non-local Aharonov-Bohm conductance oscillations in an asymmetric quan-tum ring Non-local Aharonov-Bohm conductance oscillations in an asymmetric quan-tum ring

2008-11-19

arxiv.org/abs/0811.3150v1

Appl. Phys. Lett. 94, 022107 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 4 figures

Scientific paper

10.1063/1.3069281

We investigate ballistic transport and quantum interference in a nanoscale quantum wire loop fab-ricated as a GaAs/AlGaAs field-effect heterostructure. Four-terminal measurements of current and voltage characteristics as a function of top gate voltages show negative bend resistance as a clear signature of ballistic transport. In perpendicular magnetic fields phase-coherent transport leads to Aharonov-Bohm (AB) conductance oscillations which show equal amplitudes in the local and the non-local measurement at a temperature of 1.5 K and above. We attribute this novel observation to the symmetry of the orthogonal cross junctions connecting the four quantum wire leads with the asymmetric quantum wire ring.

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