Hot phonon effect in mid-infrared HgTe/CdHgTe quantum wells evaluated by quasi-steady-state photoluminescence

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2024-11-26 DOI:10.1063/5.0239225

K. E. Kudryavtsev, V. V. Rumyantsev, A. A. Dubinov, V. Y. Aleshkin, M. S. Zholudev, N. N. Mikhailov, S. A. Dvoretsky, V. I. Gavrilenko, S. V. Morozov

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Abstract

Room-temperature photoluminescence (PL) spectra of intensely pumped HgTe/CdHgTe quantum well (QW) heterostructures emitting at around 5 μm wavelength have been investigated. Based on the model description of the PL spectra using a free-electron recombination band approach, effective electronic temperatures were determined depending on the excitation density. Within the quasi-steady-state approximation, we establish the balance between pump-induced heating of the electron gas in the QWs and phonon-mediated dissipation of this excess energy and deduce hot-phonon lifetime of ∼0.47 ps. Maximum operating temperatures for optically pumped HgTe/CdHgTe QW laser heterostructures emitting at around 5 μm are estimated depending on the excitation wavelength, and lasing at Peltier temperatures appears feasible for the pump wavelength of about 3 μm. Thus, the entire 3∼5 μm atmospheric transparency window can be potentially covered by thermoelectrically cooled HgCdTe-based laser sources.

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研究了波长在 5 μm 左右的强泵浦 HgTe/CdHgTe 量子阱（QW）异质结构的室温光致发光（PL）光谱。根据使用自由电子重组带方法对聚光光谱进行的模型描述，确定了取决于激发密度的有效电子温度。在准稳态近似条件下，我们确定了 QW 中电子气体的泵诱导加热与声子介导的过剩能量耗散之间的平衡，并推导出热声子寿命为 ∼0.47 ps。根据激发波长的不同，可估算出在 5 μm 左右发射的光泵浦 HgTe/CdHgTe QW 激光异质结构的最高工作温度，而在 3 μm 左右的泵浦波长下，珀尔帖温度下的激光似乎是可行的。因此，基于热电冷却碲铜汞的激光源有可能覆盖整个 3～5 μm 的大气透明度窗口。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

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.