Factor Of Conduction Electrons Research Articles

In-plane electron g-factor anisotropy in nanowires due to the spin–orbit interaction

We present calculations of the effective g factor of conduction electrons in nanowires subjected to in-plane magnetic field in the presence of Rashba and Dresselhaus spin–orbit interactions. The intersubband coupling due to the spin–orbit interaction introduces anisotropy in the g factor. In the weak regime, our numerical and analytical results indicate that the degree of the anisotropy is quadratic in the Rashba and Dresselhaus parameters and linear in the subband index. In addition, the g factor shows enhanced dependence on the magnetic field which may lead to sign reversal, if the Zeeman splitting exceeds the energy scale characterizing the confinement potential.

Effect of the Rashba and Dresselhaus spin-splitting terms on the electron g factor in semiconductor quantum wells under applied magnetic fields

We use the Ogg–McCombe Hamiltonian together with the Dresselhaus and Rashba spin-splitting terms to find the g factor of conduction electrons in GaAs-(Ga,Al)As semiconductor quantum wells (QWS) (either symmetric or asymmetric) under a magnetic field applied along the growth direction. The combined effects of non-parabolicity, anisotropy and spin-splitting terms are taken into account. Theoretical results are given as functions of the QW width and compared with available experimental data and previous theoretical works.

Anisotropy of spingfactor inGaAs∕Ga1−xAlxAssymmetric quantum wells

Five-level $\mathbf{k}∙\mathbf{p}$ band model is used to describe the spin $g$ factor of conduction electrons in undoped $\mathrm{Ga}\mathrm{As}∕{\mathrm{Ga}}_{0.65}{\mathrm{Al}}_{0.35}\mathrm{As}$ quantum wells (QWs) with an external magnetic field parallel and transverse to the growth direction [001]. Far-band corrections to the model are also included in the theory. It is found that for QWs narrower than $10\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ the transverse ${g}_{\ensuremath{\perp}}$ factor is slightly higher than the parallel one ${g}_{\ensuremath{\Vert}}$. Our theory without any adjustable parameters describes very well the existing experimental data of various authors for both field configurations and well widths $3\phantom{\rule{0.3em}{0ex}}\mathrm{nm}\ensuremath{\leqslant}d\ensuremath{\leqslant}25\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. Comparison between the theory and experiment probes the validity of the $\mathbf{k}∙\mathbf{p}$ approach for lengths of few lattice periods.

Theory of spin splitting inGa1−xAlxAsparabolic quantum wells controlled by an electric field

The five-level $\mathbf{k}∙\mathbf{p}$ model for ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Al}}_{x}\mathrm{As}$ parabolic quantum wells, characterized by the continuously varying chemical composition $x$, is used to calculate the effective spin ${g}^{*}$ factor of conduction electrons. The theory with no adjustable parameters agrees well with the experimental data of Salis et al. [Nature 414, 619 (2001)].Both negative and positive spin ${g}^{*}$ values are described, as well as their dependence on an external electric field. The Bychkov-Rashba spin splitting due to inversion asymmetry of the structures caused by electric bias is calculated and shown to give negligible contribution to the ${g}^{*}$ values.

Improved measurement of the g factor of conduction electrons in Li particles embedded in LiF:Li

Based on a novel method to handle the space-mismatch problem, the g factor of conduction electrons in Li particles formed in LiF by neutron-irradiation has accurately been measured using the electron spin resonance )ESR)-to-proton (H 2O)-nuclear magnetic resonance (NMR) frequency-ratio method giving g LiF:Li=2.002293±0.000002. This value is in substantial disagreement with the bulk Li g value, which is ascribed to the added effects of Li self-demagnetization and LiF matrix demagnetization. High accuracy calibration of g LiF:Li is important on its own because of its frequent use as a g marker in ESR spectroscopy for which it is an almost ideal material.

The Gyromagnetic Factor of Conduction Electrons in Noble and Transition Metals

The Gyromagnetic Factor of Conduction Electrons in Noble and Transition Metals

The g factor of conduction electrons in aluminium: calculation and application to spin resonance

Calculates the g factor at every point of the Fermi surface of aluminium by using a classical 'four orthogonalised plane waves' scheme and by introducing the spin-orbit potential as a perturbation. An important difficulty remains, linked to the choice of the wavefunction phase. Moreover a phenomenological model is proposed based on the narrowing of the g distribution by two types of motion: a random one corresponding to the diffusion of electrons on the crystalline imperfections and a coherent one around the cyclotron orbits. A qualitative model accounts relatively well for the spin resonance experiment data.

Measurement of thegFactor of Conduction Electrons by Optical Detection of Spin Resonance inp-Type Semiconductors

A new optical method to detect conduction-electron spin resonance in semiconductors is described. Its main interest is its application to undoped samples in which the properties of free carriers are not perturbed by shallow donor impurities. The $g$ factor of ${10}^{8}$ photocreated electrons at the bottom of the conduction band in $p$-type GaSb was measured to be $|{g}^{*}|=9.3\ifmmode\pm\else\textpm\fi{}0.3$. It is different from most of the previous experimental determinations and from the theoretical prediction $g_{\mathrm{th}}^{}{}_{}{}^{*}=\ensuremath{-}6.66$.

Electron Spin Resonance in Antimony

Electron spin resonance of conduction electrons in antimony has been investigated at 34.3 kMc/sec and 1.5\ifmmode^\circ\else\textdegree\fi{}K. The results were consistent with the theory of Cohen and Blount for the $g$ factor of conduction electrons in Bi and Sb. The principal axes of the $g$ tensor coincided with those of the tilted-ellipsoidal Fermi surface. The parameters of the electron spin resonance were determined to be ${g}_{1}=3.4$, ${g}_{2}=29.5$, ${g}_{3}=3$. Resonance was also observed from transitions that involved both an orbital transition and a Zeeman transition.