284 research outputs found
Phase coherence in the inelastic cotunneling regime
Two quantum dots with tunable mutual tunnel coupling have been embedded in a
two-terminal Aharonov-Bohm geometry. Aharonov-Bohm oscillations are
investigated in the cotunneling regime. Visibilities of more than 0.8 are
measured indicating that phase-coherent processes are involved in the elastic
and inelastic cotunneling. An oscillation-phase change of pi is detected as a
function of bias voltage at the inelastic cotunneling onset.Comment: 4 pages, 4 figure
Aharonov-Bohm oscillations in the presence of strong spin-orbit interactions
We have measured highly visible Aharonov-Bohm (AB) oscillations in a ring
structure defined by local anodic oxidation on a p-type GaAs heterostructure
with strong spin-orbit interactions. Clear beating patterns observed in the raw
data can be interpreted in terms of a spin geometric phase. Besides h/e
oscillations, we resolve the contributions from the second harmonic of AB
oscillations and also find a beating in these h/2e oscillations. A resistance
minimum at B=0T, present in all gate configurations, is the signature of
destructive interference of the spins propagating along time-reversed paths.Comment: 4 pages, 3 figures, published versio
Electronic transport through a quantum dot network
The conductance through a finite quantum dot network is studied as a function
of inter-dot coupling. As the coupling is reduced, the system undergoes a
transition from the antidot regime to the tight binding limit, where Coulomb
resonances with on average increasing charging energies are observed.
Percolation models are used to describe the conduction in the open and closed
regime and contributions from different blockaded regions can be identified. A
strong negative average magnetoresistance in the Coulomb blockade regime is in
good quantitative agreement with theoretical predictions for magnetotunneling
between individual quantum dots.Comment: 5 pages, 5 figure
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