Nonmonotonic quantum phase gathering in curved spintronic circuits
Spin carriers propagating along quantum circuits gather quantum spin phases depending on the circuit’s size, shape, and spin-orbit coupling (SOC) strength. These phases typically grow monotonically with the SOC strength, as found in Rashba quantum wires and rings. In this work we show that the spin-...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/135648 |
| Acceso en línea: | https://hdl.handle.net/11441/135648 https://doi.org/10.1103/PhysRevB.104.195308 |
| Access Level: | acceso abierto |
| Palabra clave: | Quantum phase Curved spintronic circuits |
| Sumario: | Spin carriers propagating along quantum circuits gather quantum spin phases depending on the circuit’s size, shape, and spin-orbit coupling (SOC) strength. These phases typically grow monotonically with the SOC strength, as found in Rashba quantum wires and rings. In this work we show that the spin-phase gathering can be engineered by geometric means, viz., by the geometric curvature of the circuits, to be nonmonotonic. We demonstrate this peculiar property by using one-dimensional polygonal models where flat segments alternate with highly curved vertices. The complex interplay between dynamic and geometric spin-phase components— triggered by a series of emergent spin degeneracy points—leads to bounded, global spin phases. Moreover, we show that the particulars of the spin-phase gathering have observable consequences in the Aharonov-Casher conductance of Rashba loops, a connection that passed unnoticed in previous works. |
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