We observed the recently predicted quantum suppression of dynamical Coulomb blockade on short coherent conductors by measuring the conductance of a quantum point contact embedded in a tunable on-chip circuit. Taking advantage of the circuit modularity we measured most parameters used by the theory. This allowed us to perform a reliable and quantitative experimental test of the theory. Dynamical...

We study spin-dependent transport through ferromagnet/normal-metal/ferromagnet double tunnel junctions in the mesoscopic Coulomb-blockade regime. We calculate the conductance in the absence or presence of spin-orbit interaction and for arbitrary orientation of the lead magnetizations. The tunneling magnetoresistance ~TMR!, defined at the Coulomb-blockade conductance peaks, is calculated and its...

We present results on the dynamics of the charging of arrays of InAs self-assembled quantum dots ~SAQD’s!. An equivalent circuit used for metal-insulator-semiconductor–field-effect transistor structures is applied and successfully predicts the observed behavior of the capacitance and conductance dependence on the excitation frequency. The Coulomb blockade effect also plays a role in the frequen...

In the classical Josephson effect the phase difference across the junction is well defined, and the supercurrent is reduced only weakly by phase diffusion. For mesoscopic junctions with small capacitance the phase undergoes large quantum fluctuations, and the current is also decreased by Coulomb blockade effects. We discuss the behavior of the current-voltage characteristics in a large range of...

We propose an idea for probing spin states of two coupled quantum dots (CQD), by the dc Josephson current flowing through them. This theory requires weak coupling between CQD and electrodes, but allows arbitrary inter-dot tunnel coupling, intraand interdot Coulomb interactions. We find that the Coulomb blockade peaks exhibit a non-monotonous dependence on the Zeeman splitting of CQD, which can ...

The semiconductor integrated circuit technology has formed the basis of today’s information oriented society and supported its continuous progress. However, several problems such as high power density and quantum effects have been serious recently. On the other hand, recent development of nanotechnologies realizes the use of a nano-scale device for us. On such a tiny tunnel junction, electron t...

We study transport properties of a single electron transistor based on elastic nanotube. Assuming that an external compressive force is applied to the nanotube, we focus vicinity Euler buckling instability. demonstrate in this regime through extremely sensitive disorder. In particular, built-in curvature (random or regular) leads ``elastic blockade'': appearance threshold bias voltage $I$-$V$ c...

nano-crystalline Si dots of dimensions of 8nm have been incorporated into a variety of Coulomb blockade and floating gate memory devices. Structures include vertical transistor, planar electrode, nanoscale channel junction and 2-gate trench structure. Ballistic transport, Coulomb oscillation and memory effects are clearly demonstrated

We report the experimental evidence for the formation of multi-quantum dots in a hydrogenated single-layer graphene flake. The existence of multi-quantum dots is supported by the low-temperature measurements on a field effect transistor structure device. The resulting Coulomb blockade diamonds shown in the color scale plot together with the number of Coulomb peaks exhibit the characteristics of...

Semiconductor nanowires provide promising low-dimensional systems for the study of quantum transport phenomena in combination with superconductivity. Here we investigate the competition between the Coulomb blockade effect, Andreev reflection, and quantum interference, in InAs and InP nanowires connected to aluminum-based superconducting electrodes. We compare three limiting cases depending on t...