Ridge waveguide lasers with vertically stacked quantum wells and tunnel junctions

Narrow ridge waveguide high power single mode 1.3-μm InAs/InGaAs ten-layer quantum dot lasers

Ten-layer InAs/In0.15Ga0.85As quantum dot (QD) laser structures have been grown using molecular beam epitaxy (MBE) on GaAs (001) substrate. Using the pulsed anodic oxidation technique, narrow (2 lm) ridge waveguide (RWG) InAs QD lasers have been fabricated. Under continuous wave operation, the InAs QD laser (2 · 2,000 lm) delivered total output power of up to 272.6 mW at 10 C at 1.3 lm. Under p...

Modelling of fluxon dynamics in stacked Josephson tunnel junctions

Improved Temperature Performance of 1.31- m Quantum Dot Lasers by Optimized Ridge Waveguide Design

In this letter, we demonstrate the importance of the fabricated device structure for the external differential efficiency, threshold current density, and maximum operating temperature for ground state operation of a 1.31m quantum dot laser. The introduction of a shallow ridge etch design and selective electroplating of the gold bondpads is demonstrated to offer improved performance in compariso...

Spin interactions and switching in vertically tunnel-coupled quantum dots

We determine the spin-exchange coupling J between two electrons located in two vertically tunnel-coupled quantum dots, and its variation when magnetic ~B! and electric ~E! fields ~both in-plane and perpendicular! are applied. We predict a strong decrease of J as the in-plane B field is increased, mainly due to orbital compression. Combined with the Zeeman splitting, this leads to a singlet-trip...

Biexciton Resonances Reveal Exciton Localization in Stacked Perovskite Quantum Wells.

Quasi-two-dimensional lead halide perovskites, MAn-1PbnX3n+1, are quantum confined materials with an ever-developing range of optoelectronic device applications. Like other semiconductors, the correlated motion of electrons and holes dominates the material's response to optical excitation influencing its electrical and optical properties such as charge formation and mobility. However, the effec...