Stability of spintronic devices based on quantum ring networks

Abstract

Transport properties in mesoscopic networks are investigated, where the strength of the (Rashba-type) spin-orbit coupling is assumed to be tuned with external gate voltages. We analyze in detail to what extent the ideal behavior and functionality of some promising network-based devices are modified by random (spin-dependent) scattering events and by thermal fluctuations. It is found that although the functionality of these devices is obviously based on the quantum coherence of the transmitted electrons, there is a certain stability: moderate level of errors can be tolerated. For mesoscopic networks made of typical semiconductor materials, even cryogenic temperatures can smear out the desired transport properties. When the energy distribution of the input carriers is narrow enough, it turns out that the devices can operate close to their ideal limits even at relative high temperature. As an example, we present results for two different networks: one that realizes a Stern-Gerlach device and another that simulates a spin quantum walker. Finally we propose a simple network that can act as a narrow band energy filter even in the presence of random scatterers.

9 pages, 10 figures, submitted to PRB

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Cited by in corpus (9)

• Bound states and persistent currents in topological insulator rings
• Spin transport through a quantum network: Effects of Rashba spin orbit interaction and Aharonov-Bohm flux
• Logical XOR gate response in a quantum interferometer: A spin dependent transport
• Topological insulator ring with magnetic impurities
• High temperature conductance of a two-dimensional superlattice controlled by spin-orbit interaction
• Spin-orbit interaction controlled properties of two-dimensional superlattices: Spintronic crystals
• Möbius transformations and electronic transport properties of large disorderless networks
• Magnetic forces and stationary electron flow in three-terminal semiconductor quantum ring
• Oscillating spin-orbit interaction as a source of spin-polarized wave packets in two-terminal nanoscale devices