Giant quantum oscillations of nuclear spin relaxation rate in QHE systems with magnetic impurities
| Autor: | P. Dahan, I. D. Vagner |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Physics
Condensed matter physics Phonon Relaxation (NMR) Resonance Quantum oscillations Quantum Hall effect Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Electronic Optical and Magnetic Materials Magnetic field Impurity Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons Electrical and Electronic Engineering Atomic physics Magnetic impurity |
| Zdroj: | Physica B: Condensed Matter. :465-469 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2004.01.128 |
| Popis: | We study the phonon-assisted mechanism for nuclear spin relaxation (NSR) of magnetic impurity in two-dimensional electron gas system under quantum-Hall effect conditions. The nuclear spin impurity interacts mainly with discrete bound Landau state caused by resonance scattering with the impurity. The lattice distortion around the defect creates localized phonons which take part in the spin-flip transition. It is found that in the field dependence of the NSR rate T 1 −1 only the equidistant resonance transitions depending on the frequency of the localized phonon are allowed. This spectral structure may be used as a probe for studying the localized vibrational modes frequency and the electron–phonon coupling for various magnetic impurities. The obtained NSR rate, T 1 −1 , oscillates periodically in the inverse magnetic field. Estimation for Fe impurity in GaAs quantum well is given. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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