Spin noise of itinerant fermions

Abstract

We develop a theory of spin noise spectroscopy of itinerant, noninteracting, spin-carrying fermions in different regimes of temperature and disorder. We use kinetic equations for the density matrix in spin variables. We find a general result with a clear physical interpretation, and discuss its dependence on temperature, the size of the system, and applied magnetic field. We consider two classes of experimental probes: 1. electron-spin-resonance (ESR)-type measurements, in which the probe response to a uniform magnetization increases linearly with the volume sampled, and 2. optical Kerr/Faraday rotation-type measurements, in which the probe response to a uniform magnetization increases linearly with the length of the light propagation in the sample, but is independent of the cross section of the light beam. Our theory provides a framework for interpreting recent experiments on atomic gases and conduction electrons in semiconductors and provides a baseline for identifying the effects of interactions on spin noise spectroscopy.

References in corpus (3)

• Spin noise of electrons and holes in self-assembled quantum dots
• Spin noise spectroscopy in GaAs (110) quantum wells: Access to intrinsic spin lifetimes and equilibrium electron dynamics
• "Listening" to the spin noise of conduction electrons in bulk n:GaAs

Cited by in corpus (7)

• Semiconductor Spin Noise Spectroscopy: Fundamentals, Accomplishments, and Challenges
• The Theory of Spin Noise Spectroscopy: A Review
• Spin noise in quantum dot ensembles
• Theory of spin noise in nanowires
• Nonequilibrium spin noise spectroscopy
• Higher Order Spin Noise Statistics
• Exciton spin noise in quantum wells