Quantum interference of electrons in a ring: tuning of the geometrical phase
arXiv:cond-mat/0505273 · doi:10.1103/PhysRevLett.95.226803
Abstract
We calculate the oscillations of the DC conductance across a mesoscopic ring, simultaneously tuned by applied magnetic and electric fields orthogonal to the ring. The oscillations depend on the Aharonov-Bohm flux and of the spin-orbit coupling. They result from mixing of the dynamical phase, including the Zeeman spin splitting, and of geometric phases. By changing the applied fields, the geometric phase contribution to the conductance oscillations can be tuned from the adiabatic (Berry) to the nonadiabatic (Ahronov-Anandan) regime. To model a realistic device, we also include nonzero backscattering at the connection between ring and contacts, and a random phase for electron wavefunction, accounting for dephasing due to disorder.
arXiv comment4 pages, 3 figures, minor changes
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- Spin geometric-phases in hopping magnetoconductance
- Two impurity Kondo problem under Aharonov--Bohm and Aharonov--Casher Effects
- Effective tuning of electron charge and spin distribution in a dot-ring nanostructure at the ZnO interface
- Localized states in a semiconductor quantum ring with a tangent wire