Mihaly G. Benedict

Quantum rings as electron spin beam splitters

Quantum interference and spin-orbit interaction in a one-dimensional mesoscopic semiconductor ring with one input and two output leads can act as a spin beam splitter. Different polarization can be achieved in the two output channels from an originally totally unpolarized incoming spin state, very much like in a Stern-Gerlach apparatus. We determine the relevant parameters such that the device has unit efficiency.

Networks of quantum nanorings: programmable spintronic devices.

An array of quantum rings with local (ring by ring) modulation of the spin orbit interaction (SOI) can lead to novel effects in spin state transformation of electrons. It is shown that already small (3 x 3, 5 x 5) networks are remarkably versatile from this point of view: Working in a given network geometry, the input current can be directed to any of the output ports, simply by changing the SOI strengths by external gate voltages. Additionally, the same network with different SOI strengths can be completely analogous to the Stern-Gerlach device, exhibiting spatial-spin entanglement.

Aharonov-Bohm oscillations in a mesoscopic ring with asymmetric arm-dependent injection

Electron transport through mesoscopic, one-dimensional rings with asymmetric injection into the arms of the ring is studied, in the presence of a Aharonov-Bohm flux, by means of an appropriate

Spatial interference induced spin polarization in a three-terminal quantum ring

\mathbf{S}

The effect of dynamical Bloch oscillations on optical-field-induced current in a wide-gap dielectric

matrix. This matrix is expressed in terms of two parameters, one of which

Magnetoconductance of rectangular arrays of quantum rings

(\ensuremath{\lambda})

Time evolution in the Morse potential using supersymmetry: Dissociation of the NO molecule

accounts phenomenologically for this asymmetric injection into the arms of the ring. In addition, the effect of a scatterer placed in one arm of the ring is considered. Explicit expressions are obtained for the transmission as a function of the incident electron energy, the magnetic field, the asymmetry parameter

Coherent states and the role of the affine group in the quantum mechanics of the Morse potential

\ensuremath{\lambda}

Time dependence of quantum entanglement in the collision of two particles

, and the strength of the scatterer. Results of the literature for symmetric rings are described by

Coherent states and global entanglement in an N qubit system

\ensuremath{\lambda}=1