Spin noise in a quantum dot ensemble: from a quantum mechanical to a semi-classical description
arXiv:1403.3550 · doi:10.1002/pssb.201451103
Abstract
Spin noise spectroscopy is a promising technique for revealing the microscopic nature of spin dephasing processes in quantum dots. We compare the spin-noise in an ensemble of singly charged quantum dots calculated by two complementary approaches. The Chebyshev polynomial expansion technique (CET) accounts for the full quantum mechanical fluctuation of the nuclear spin bath and a semi-classical approach (SCA) is based on the averaging the electron spin dynamics over all different static Overhauser field configurations. We observe a remarkable agreement between both methods in the high-frequency part of the spectra, while the low-frequency part is determined by the long time fluctuations of the Overhauser field. We find small differences in the spectra depending on the distribution of hyperfine couplings. The spin-noise spectra in strong enough magnetic fields where the nuclear dynamics is quenched calculated by two complimentary approaches are in perfect agreement.
6 pages, 3 figures
References in corpus (9)
- The density-matrix renormalization group in the age of matrix product states
- The Kernel Polynomial Method
- Hyperfine interaction in a quantum dot: Non-Markovian electron spin dynamics
- Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
- Spin noise spectroscopy in GaAs (110) quantum wells: Access to intrinsic spin lifetimes and equilibrium electron dynamics
- Exact dynamics in the inhomogeneous central-spin model
- Integrability-based analysis of the hyperfine-interaction -nduced decoherence in quantum dots
- Semiclassical dynamics and long time asymptotics of the central-spin problem in a quantum dot
- Spin noise in quantum dot ensembles