Spin-orbit interactions in inversion-asymmetric two-dimensional hole systems: A variational analysis

Plasmons in spin-orbit coupled two-dimensional hole gas systems

We study the dynamical dielectric function of a two-dimensional hole gas, exemplified on [001] GaAs and InAs quantum wells, within the Luttinger model extended to the two lowest subbands including bulk and structure inversion asymmetric terms. The plasmon dispersion shows a pronounced anisotropy for GaAsand InAs-based systems. In GaAs this leads to a suppression of plasmons due to Landau dampin...

Spin precession in inversion-asymmetric two-dimensional systems

We present a theoretical method to calculate the expectation value of spin in an inversion-asymmetric twodimensional (2D) system with respect to an arbitrarily spin-polarized electron state, injected via an ideal point contact. The 2D system is confined in a [001]-grown quantum well, where both the Rashba and the Dresselhaus spin-orbit couplings are taken into account. The obtained analytical r...

Quantum nanostructures in strongly spin-orbit coupled two- dimensional systems

Acoustic interactions between inversion symmetric and asymmetric two-level systems.

Amorphous solids, as well as many disordered lattices, display remarkable universality in their low temperature acoustic properties. This universality is attributed to the attenuation of phonons by tunneling two-level systems (TLSs), facilitated by the interaction of the TLSs with the phonon field. TLS-phonon interaction also mediates effective TLS-TLS interactions, which dictates the existence...

Hole spin dynamics and valence-band spin excitations in two-dimensional hole systems

In recent years, the spin dynamics and spin–orbit interaction in GaAs-based two-dimensional hole systems (2DHS) have created a lot of attention. This is due to the complex structure of the valence band, with its p-like character, which leads to strong spin–orbit coupling. In this paper, we review our recent studies on hole spin dynamics and valence-band spin excitations in GaAs-based, p-modulat...