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Spin Properties (spin + property)

Distribution by Scientific Domains

Physics and Astronomy	60%

Selected Abstracts

Spin properties of trions in a dense 2DEG

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 6 2010
V. Kochereshko
Abstract Reflectivity and photoluminescence spectra from CdTe/CdMgTe modulation-doped quantum well structures were studied. We have found that in reflectivity spectra the value and the sign of the Zeeman splitting of the trion lines depend on the electron concentration in the quantum well, whereas, the value and sign of the exciton line splitting are constant for all studied electron concentrations. On the other hand, in the photoluminescence spectra the sign and value of the Zeeman splitting are the same for trion and exciton. Such "renormalization" of the trion g -factor is explained in the model of combined exciton,electron processes. [source]

Quantum beats between magnetic field split states in semiconductor microcavity

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 11 2005
M. N. Makhonin
Abstract Spin properties of quantum well excitons in the active layer of planar micricavity have been analyzed using pump-and-probe technique in magnetic fields normal to the cavity plane. When exciting the cavity polaritons with linearly polarized ps pulses the differential transmission (DT) spectra show a time oscillation both in the DT signal, IDT, and spectral position of ,+ and ,, polarized lower polariton (LP) states E+ and E,. The oscillation in IDT and E+ - E, is inverse in the magnetic field and shown to be controlled by rotating the LP polarization plane due to the difference in the ,+ and ,, LP energies. The period coincides for IDT and E+ - E, whereas the phase of their oscillation differs from each other by ,/4. The decay of quantum beats increases with excitation density due to an enhanced interparticle scattering. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

NMR nomenclature: Nuclear spin properties and conventions for chemical shifts (IUPAC recommendations 2001),

CONCEPTS IN MAGNETIC RESONANCE, Issue 5 2002
Robin K. Harris
Abstract A unified scale is recommended for reporting the NMR chemical shifts of all nuclei relative to the 1H resonance of tetramethylsilane. The unified scale is designed to provide a precise ratio, ,, of the resonance frequency of a given nuclide to that of the primary reference, the 1H resonance of tetramethylsilane (TMS) in dilute solution (volume fraction, , < 1%) in chloroform. Referencing procedures are discussed, including matters of practical application of the unified scale. Special attention is paid to recommended reference samples and values of , for secondary references on the unified scale are listed, many of which are the results of new measurements. Some earlier recommendations relating to the reporting of chemical shifts are endorsed. The chemical shift, ,, is redefined to avoid previous ambiguities but to leave practical usage unchanged. Relations between the unified scale and recently published recommendations for referencing in aqueous solutions (for specific use in biochemical work) are discussed, as well as the special effects of working in the solid state with magic-angle spinning. In all, nine new recommendations relating to chemical shifts are made. Standardized nuclear spin data are also presented in tabular form for the stable (and some unstable) isotopes of all elements with non-zero quantum numbers. The information given includes quantum numbers, isotopic abundances, magnetic moments, magnetogyric ratios and receptivities, together with quadrupole moments and linewidth factors (where appropriate). © 2001 IUPAC. Concepts Magn Reson 14:326,346, 2002 [source]

NMR nomenclature: nuclear spin properties and conventions for chemical shifts.

MAGNETIC RESONANCE IN CHEMISTRY, Issue 7 2002
Applied Chemistry., IUPAC Recommendations 2001., International Union of Pure
Abstract An Addendum has been published for this article in Magnetic Resonance in Chemistry 40(9) 2002, 622. A unified scale is recommended for reporting the NMR chemical shifts of all nuclei relative to the 1H resonance of tetramethylsilane. The unified scale is designed to provide a precise ratio, ,, of the resonance frequency of a given nuclide to that of the primary reference, the 1H resonance of tetramethylsilane (TMS) in dilute solution (volume fraction, , < 1%) in chloroform. Referencing procedures are discussed, including matters of practical application of the unified scale. Special attention is paid to recommended reference samples, and values of , for secondary references on the unified scale are listed, many of which are the results of new measurements. Some earlier recommendations relating to the reporting of chemical shifts are endorsed. The chemical shift, ,, is redefined to avoid previous ambiguities but to leave practical usage unchanged. Relations between the unified scale and recently published recommendations for referencing in aqueous solutions (for specific use in biochemical work) are discussed, as well as the special effects of working in the solid state with magic-angle spinning. In all, nine new recommendations relating to chemical shifts are made. Standardized nuclear spin data are also presented in tabular form for the stable (and some unstable) isotopes of all elements with non-zero quantum numbers. The information given includes quantum numbers, isotopic abundances, magnetic moments, magnetogyric ratios and receptivities, together with quadrupole moments and linewidth factors (where appropriate). Copyright 2001 IUPAC. Reprinted with permission from Pure Appl. Chem. 2001; 73: 1795. [source]

Spin polarization in a single InAs/InP quantum dot

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 11 2006
Weidong Sheng
Abstract We report on a theoretical study of the spin properties of electrons and holes in a single InAs/InP selfassembled quantum dot by means of an empirical tight-binding method. When the magnetic field is varied from the Faraday to Voigt configuration, electrons and holes are found to exhibit different spin polarization: the electron spin is found to follow the direction of the magnetic field while the hole spin is frozen along the growth direction of the dot. The frozen spin of holes is attributed to the dominant heavy-hole component in the hole states, which also leads to a zero in-plane g factor of holes. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]