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Abstract
Resonant tunneling injection is a key ingredient in achieving population inversion in a putative quantum dot cascade laser. In a quantum dot based structure, such resonant current requires a matching of the wavefunction shape in k-space between the injector and the quantum dot. We show experimentally that the injection into an excited state of a dash structure can be enhanced tenfold by an in-plane magnetic field that shifts the injector distribution in k-space. These experiments, performed on resonant tunneling diode structures, show unambiguously resonant tunneling into an ensemble of InAs dashes grown between two AlInAs barrier layers. They also show that interface roughness scattering can enhance the tunneling current.
Highlights
Resonant tunneling injection is a key ingredient in achieving population inversion in a putative quantum dot cascade laser
The quantum dot cascade laser (QDCL) addresses the weaknesses of purely QW based cascade lasers (QCLs) by introducing quantum dots fully quantizing the electronic states into discrete atom-like energy levels
As discussed in [8], the quantum dashes have an extension of approximately 14 ± 5 nm along [110], 71 ± 37 nm along [1,2,3,4,5,6,7,8,9,10] and 2.4 ± 0.5 nm along the growth direction [001] measured with TEM (figure 1) and SEM [8]
Summary
We use quantum dash resonant tunneling diodes (RTDs) to study the injection and outcoupling mechanism in a proposed quantum dot cascade laser (QDCL) structure [1,2,3] for which various. The QDCL addresses the weaknesses of purely QW based cascade lasers (QCLs) by introducing quantum dots fully quantizing the electronic states into discrete atom-like energy levels These interrupt the numerous in-plane scattering paths—including optical phonon scattering—in QWs, thereby increasing the upper laser level lifetime. We discuss the transport properties of a double barrier RTD containing elongated quantum dots (called QDashes here) on InP substrate in strong in-plane magnetic fields. These QDashes exhibit TE polarized absorption and emission and are promising for the development of a QDCL with a 3D confined active region [8]. This is explained with an improved k-space overlap of the QW emitter state wavefunction and the dash excited state
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