yenero.blogg.se - Qutim mechanics

The SHE has traditionally been thought of as a consequence of spin-dependent chirality in impurity scattering that occurs in systems with spin-orbit (SO) coupling. Recently there has been considerable interest in an alternate strategy in which edge spin densities are generated electrically via the spin Hall effect (SHE), i.e., in a planar device by the current of spins oriented perpendicular to the plane that is generated by and flows perpendicular to an electric field. Finite spin densities in semiconductors have traditionally been generated by external magnetic fields, by circularly polarized light sources, or by spin injection from spin-aligning materials, such as ferromagnets. Semiconductor spintronics is based on the controlled generation of localized spin densities. In an AB ring system, the Fano-Kondo effect has been also observed and the parameter of interference is tuned by the AB flux.

We have observed the combined effect of the Fano effect and the Kondo effect – the Fano-Kondo effect in a side-coupled quantum dot system, which manifests the quantum coherence of the Kondo singlet state and at the same time the phase shift locking to π/2. Around a resonance peak of the dot, the interference effect appears as the Fano effect, which also gives information on the phase shift through the dot. We present evidence of quantum decoherence due to the spin-flip scattering in a dot through the Aharonov-Bohm (AB) amplitude when the Kondo effect does not emerge. Here we focus on the role of spin scattering in a quantum dot to the coherent transport through it. The interference picks up coherent transport through the dots, which provides information on electronic states including many body effects in them. We report experiments on the transport through interference circuits, in which semiconductor quantum dots are embedded. Readership: Scientists and researchers in academia and industry interested in quantum physics. Self-Trapping of Bose–Einstein Condensates by Oscillating Interactions (H Saito & M Ueda).Quantum Phenomena Visualized Using Electron Waves (A Tonomura).Transport Properties in Low Dimensional Artificial Lattice of Gold Nano-Particles (S Saito et al.).Carbon Nanotubes and Unique Transport Properties: Importance of Symmetry and Channel Number (T Ando).Nonlinear Quantum Effects in Nanosuperconductors (C Carballeira et al.).

Theory of Spin Transfer Phenomena in Magnetic Metals and Semiconductors (A S Núñez & A H MacDonald).

Geometry and the Anomalous Hall Effect in Ferromagnets (N P Ong & W-L Lee).

Tunable Tunnel and Exchange Couplings in Double Quantum Dots (S Tarucha et al.).

Decoherence of a Josephson Junction Flux Qubit (Y Nakamura et al.).

Quantum Optics with Single Atoms and Photons (H J Kimble).

The volume serves both as an excellent reference for experts and a useful introduction for newcomers to the field of quantum coherence and decoherence.Ĭhapter 1: Albert Einstein: Opportunity and Perception (526 KB) The papers collected in this volume cover a wide range of quantum physics, including quantum information and entanglement, quantum computing, quantum-dot systems, the anomalous Hall effect and the spin-Hall effect, spin related phenomena, superconductivity in nano-systems, precise measurements, and fundamental problems. The goal of the 8th International Symposium on Foundations of Quantum Mechanics in the Light of New Technology was to link recent advances in technology with fundamental problems and issues in quantum mechanics with an emphasis on quantum coherence, decoherence, and geometrical phase.