We report on a millijoule-level Yb-doped photonic crystal fiber (PCF) laser passively Q-switched with AlGaInAs quantum wells (QWs). Three types of AlGaInAs devices with different QW numbers are fabricated to investigate the performance. With 50 groups of three AlGaInAs QWs as a saturable absorber (SA), the PCF laser generates an average power of 7.1 W with a pulse repetition rate of 6.5 kHz at ...

Spin-sensitive saturation of absorption of infrared radiation has been investigated in p-type GaAs QWs. It is shown that the absorption saturation of circularly polarized radiation is mostly controlled by the spin relaxation time of the holes. The saturation behavior has been investigated for different QW widths and in dependence on the temperature with the result that the saturation intensity ...

The effect of well width on both the photoluminescence (PL) and phonon emission in optically excited InGaN multiple quantum well (MQW) samples has been investigated. For narrow MQW samples (w < 2.5 nm), the lowtemperature PL quantum efficiency is close to unity with the phonon emission being due mainly to carrier relaxation in the QWs. For wider MQWs samples the PL quantum efficiency is reduced...

Our recent study [Phys. Rev. B 103, 085309 (2021)] verified the existence of $\bf{k}$-linear Rashba spin-orbit coupling (SOC) two-dimensional hole gases in quantum wells (QWs) which originates from a combination heavy-hole-light-hole (HH-LH) mixing and direct dipolar to external electric field. However, SOC dependence on QW orientations remains unclear. Here, we explore this uncover an upper lo...

Recent experiments on quantum walks (QWs) of a single and two particles demonstrated subtle statistics-dependent in one-dimensional (1D) lattices. However the roles interaction statistics such kind are little known at many-body level. In this letter, using time-evolving block decimation algorithm perturbation theory we rigorously study QWs, Bloch oscillations Fisher informations (FIs) for three...

In general, control over the degree of spin orientation of photocreated charge carriers in semiconductor structures is achieved by polarized-light excitation of optical transitions in conformity with the angular momentum selection rules. In semiconductor quantum wells (QWs) the spin dynamics results from the individual dynamics of the electron spin (components 1/2, in units of ~) or heavy hole ...

We propose an efficient hyperentanglement source emitting photon pairs entangled in both energy and polarization. The compact electrically driven room-temperature source, based on intersubband two-photon emission from semiconductor quantum wells (QWs) exhibits pair generation rates several orders of magnitude higher than alternative conventional schemes. A theoretical formalism is derived for t...

It is shown that absorption of circularly polarized infrared radiation achieved by inter-subband and intra-subband (Drude-like) transitions results in a monopolar spin orientation of free carriers. The monopolar spin polarization in zinc-blende-based quantum wells (QWs) is demonstrated by the observation of the spin-galvanic and circular photogalvanic effects. It is shown that monopolar spin or...

A detailed study of the circular photogalvanic effect (CPGE) in SiGe structures is presented. It is shown that the CPGE becomes possible due to the built-in asymmetry of quantum wells (QWs) in compositionally stepped samples and in asymmetrically doped structures. The photocurrent arises due to optical spin orientation of free carriers in QWs with spin splitting in k-space. It is shown that the...

The photoluminescence (PL) and PL excitation (PLE) spectra of CdTe/ZnTe asymmetric double quantum well (QW) structures are studied on a series samples containing two CdTe layers with nominal thicknesses 2 4 monolayers (ML) in the ZnTe matrix. differ thickness spacer between QWs which is 45, 65 75 ML. It has been found that at above-barrier from shallow QW sufficiently weak intensities determine...