Jeudi 20 novembre
Résumé :
Quantum dots, or artificial atoms, confine charge carriers in threedimensional
islands in a semiconductor environment. Detailed understanding
and exquisite control of the charge and spin state of the electrically tunable
charge occupancy have been demonstrated over the years. Quantum dots
with best quality for transport experiments are usually realized in n-type
AlGaAs/GaAs heterostructures. Novel material systems, such as graphene,
nanowires and p-type heterostructures offer unexplored parameter regimes in
view of spin-orbit interactions, carrier-carrier interactions and hyperfine coupling
between electron and nuclear spins, which might be relevant for future
spin qubits realized in quantum dots. With more sophisticated nanotechnology
it has become possible to fabricate coupled quantum systems where
classical and quantum mechanical coupling and back action is experimentally
investigated. Using coupled quantum systems it has become possible to study
time-dependent transport on the level of individual electrons which gives access
to the full statistics of current fluctuations becomes experimentally. Furthermore
ultra small currents (aA) can be measured. In addition we demonstrate
on-chip emission and detection of single microwave photons as well as singleelectron
interference.
RECRUTEMENT ACCES DIRECT
Le département de physique
Fête de la Science 2018 