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|Type:||Artigo de periódico|
|Title:||Magnetization, Spin Current, And Spin-transfer Torque From Su (2) Local Gauge Invariance Of The Nonrelativistic Pauli-schrödinger Theory|
|Abstract:||In this Brief Report, we consider local gauge symmetries of the nonrelativistic Pauli-Schrödinger theory. From the simplest free Lagrangian density for Pauli two-component spinors, we obtain the spin interaction with a magnetic field and define the spin-current vector without invoking relativistic theory. Applying U (1) ×SU (2) local gauge symmetry, and proceeding via the Noether's theorem, we are able to construct a covariant conserved spin-current density in a natural way. Our approach allow us to understand the main features of spin transport properties and suggests that SU (2) is a fundamental symmetry of nonrelativistic quantum mechanics. © 2008 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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