Spin Transistor Action from Hidden Onsager Reciprocity
| Autor: | Ph. Jacquod, Klaus Richter, Matthias Scheid, İnanç Adagideli, Vitalij Lutsker |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Physics
72.25.Dc Mesoscopic physics 85.75.-d ddc:530 General Physics and Astronomy 02 engineering and technology Electron Fermion 530 Physik 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field QC Physics Quantum mechanics Reciprocity (electromagnetism) 0103 physical sciences Spin transistor QC176-176.9 Solids. Solid state physics Gauge theory Onsager reciprocal relations 010306 general physics 0210 nano-technology 73.23.-b |
| Zdroj: | Physical Review Letters. 108 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.108.236601 |
| Popis: | We investigate generic Hamiltonians for confined electrons with weak inhomogeneous spin-orbit coupling. Using a local gauge transformation we show how the SU(2) Hamiltonian structure reduces to a U(1) X U(1) structure for spinless fermions in a fictitious orbital magnetic field, to leading order in the spin-orbit strength. Using an Onsager relation, we further show how the resulting spin conductance vanishes in a two-terminal setup, and how it is turned on by either weakly breaking time-reversal symmetry or opening additional transport terminals, thus allowing one to switch the generated spin current on or off. We numerically check our theory for mesoscopic cavities as well as Aharonov-Bohm rings. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|