Transport through single-level systems: Spin dynamics in the nonadiabatic regime
arXiv:1208.4574 · doi:10.1103/PhysRevB.86.245317
Abstract
We investigate the Fano-Anderson model coupled to a large ensemble of spins under the influence of an external magnetic field. The interaction between the two spin systems is treated within a meanfield-approach and we assume an anisotropic coupling between these two systems. By using a nonadiabatic approach, we make no further approximations in the theoretical description of our system, apart from the semiclassical treatment. Therewith, we can include the short-time dynamics as well as the broadening of the energy levels arising due to the coupling to the external electronic reservoirs. We study the spin dynamics in the regime of low and high bias. For the infinite bias case, we compare our results to those obtained from a simpler rate equation approach, where higher-order transitions are neglected. We show, that these higher-order terms are important in the range of low magnetic field. Additionally, we analyze extensively the finite bias regime with methods from nonlinear dynamics, and we discuss the possibility of switching of the large spin.
16 pages, 16 figures
References in corpus (29)
- Spins in few-electron quantum dots
- Spin Transfer Torques
- Electron transport through single Mn12 molecular magnets
- Coherent and Collective Quantum Optical Effects in Mesoscopic Systems
- Keldysh technique and non-linear sigma-model: basic principles and applications
- Signatures of Molecular Magnetism in Single-Molecule Transport Spectroscopy
- Nuclear spin induced oscillatory current in spin-blocked quantum dots
- Exact spectrum of the Lipkin-Meshkov-Glick model in the thermodynamic limit and finite-size corrections
- Electric-field controlled spin reversal in a quantum dot with ferromagnetic contacts
- Recipes for spin-based quantum computing
- Dynamical quantum phase transitions in the dissipative Lipkin-Meshkov-Glick model and proposed realization in optical cavity QED
- Tunnel magnetoresistance of quantum dots coupled to ferromagnetic leads in the sequential and cotunneling regimes
- Nuclear Spins in Nanostructures
- Single-molecule Nanomagnets
- Hyperfine interaction and electron-spin decoherence in graphene and carbon nanotube quantum dots
- Large nuclear Overhauser fields detected in vertically-coupled double quantum dots
- Ferromagnetic proximity effect in F-QDot-S device
- Large anisotropy of spin-orbit interaction in a single InAs self-assembled quantum dot
- Spin effects in transport through single-molecule magnets in the sequential and cotunneling regimes
- Collective spin systems in dispersive optical cavity QED: Quantum phase transitions and entanglement
- Spin-orbit coupling and anisotropy of spin splitting in quantum dots
- Transport through quantum-dot spin valves containing magnetic impurities
- Semi-classical dynamics of nano-electromechanical systems
- Current-induced switching in transport through anisotropic magnetic molecules
- Phase Transitions in Dissipative Quantum Transport and Mesoscopic Nuclear Spin Pumping
- Adiabaticity in semiclassical nanoelectromechanical systems
- Superradiance-like Electron Transport through a Quantum Dot
- Limit-Cycles and Chaos in the Current Through a Quantum Dot
- Transport and semiclassical dynamics of coupled quantum dots interacting with a local magnetic moment