20 research outputs found
Transport Spectroscopy of a Spin-Coherent Dot-Cavity System
Quantum engineering requires controllable artificial systems with quantum
coherence exceeding the device size and operation time. This can be achieved
with geometrically confined low-dimensional electronic structures embedded
within ultraclean materials, with prominent examples being artificial atoms
(quantum dots) and quantum corrals (electronic cavities). Combining the two
structures, we implement a mesoscopic coupled dot-cavity system in a
high-mobility two-dimensional electron gas, and obtain an extended spin-singlet
state in the regime of strong dot-cavity coupling. Engineering such extended
quantum states presents a viable route for nonlocal spin coupling that is
applicable for quantum information processing
Electronic g-factor and Magneto-transport in InSb Quantum Wells
High mobility InSb quantum wells with tunable carrier densities are
investigated by transport experiments in magnetic fields tilted with respect to
the sample normal. We employ the coincidence method and the temperature
dependence of the Shubnikov-de Haas oscillations and find a value for the
effective g-factor of =354 and a value for the
effective mass of , where is the electron mass in
vacuum. Our measurements are performed in a magnetic field and a density range
where the enhancement mechanism of the effective g-factor can be neglected.
Accordingly, the obtained effective g-factor and the effective mass can be
quantitatively explained in a single particle picture. Additionally, we explore
the magneto-transport up to magnetic fields of 35 T and do not find features
related to the fractional quantum Hall effect.Comment: 18 Pages, 5 Figure