Michael Lorke, Igor Khanonkin, Stephan Michael, Johann Peter Reithmaier, Gadi Eisenstein, Frank Jahnke
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引用次数: 0
Abstract
In quantum-dot tunnel-injection lasers, the excited charge carriers are efficiently captured from the bulk states via an injector quantum well and then transferred into the quantum dots via a tunnel barrier. The alignment of the electronic levels is crucial for the high efficiency of these processes and especially for the fast modulation dynamics of these lasers. In particular, the quantum mechanical nature of the tunneling process must be taken into account in the transition from two-dimensional quantum well states to zero-dimensional quantum-dot states. This results in hybrid states, from which the scattering into the quantum-dot ground states takes place. We combine electronic state calculations of the tunnel-injection structures with many-body calculations of the scattering processes and insert this into a complete laser simulator. This allows us to study the influence of the structural design and the resulting electronic states as well as limitations due to inhomogeneous quantum-dot distributions. We find that the optimal electronic state alignment deviates from a simple picture in which the quantum-dot ground state energies are one LO-phonon energy below the injector quantum well ground state.
在量子点隧道注入激光器中,激发的电荷载流子通过注入器量子阱从体态中有效捕获,然后通过隧道势垒转移到量子点中。电子水平的对准对这些过程的高效率,尤其是对这些激光器的快速调制动力学至关重要。从二维量子阱态过渡到零维量子点态时,必须特别考虑隧道过程的量子力学性质。这就产生了混合态,从混合态散射到量子点基态。我们将隧道注入结构的电子状态计算与散射过程的多体计算相结合,并将其插入到一个完整的激光模拟器中。这样,我们就可以研究结构设计和由此产生的电子状态的影响,以及不均匀量子点分布造成的限制。我们发现,最佳电子态排列偏离了量子点基态能量比注入器量子阱基态低一个 LO 光子能量的简单图景。
期刊介绍:
Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology.
In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics.
APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field.
Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.