Magnetic field induced polarization enhancement in the photoluminescence of MBE-grown WSe2 layers

IF 2.8 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications Pub Date : 2026-02-01 Epub Date: 2025-11-26 DOI:10.1016/j.ssc.2025.116263

Maksymilian Kuna , Mateusz Raczyński , Julia Kucharek , Takashi Taniguchi , Kenji Watanabe , Tomasz Kazimierczuk , Wojciech Pacuski , Piotr Kossacki

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引用次数: 0

Abstract

We report an experimental study of the magnetic-field dependence of the optically pumped valley polarization in an epitaxial tungsten diselenide (WSe₂) monolayer grown by molecular-beam epitaxy (MBE) on a hexagonal boron nitride (hBN) substrate. Circularly polarized photoluminescence (PL) measurements reveal that applying a weak out-of-plane magnetic field, on the order of 0.1 T, dramatically increases the effectiveness of the optical orientation of the emission associated with defect-bound localized excitons. We compare the obtained results with the earlier studies on the reference exfoliated monolayers, discussing both qualitative similarity as well as quantitative differences. Our observations are further supplemented by the results of time-resolved PL measurements, which confirm the pseudospin relaxation time of approximately 25 ps, a value significantly shorter than the

\approx

100 ps previously reported for mechanically exfoliated samples.

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mbe生长的WSe2层的光致发光磁场诱导极化增强

本文报道了在六方氮化硼（hBN）衬底上采用分子束外延（MBE）生长的二硒化钨（WSe2）单层外延层中光泵谷极化对磁场依赖性的实验研究。圆偏振光致发光（PL）测量表明，施加0.1 T量级的弱面外磁场，显著提高了与缺陷束缚局域激子相关的发射的光学取向的有效性。我们将得到的结果与早期对参考剥落单层的研究进行了比较，讨论了定性相似性和定量差异。我们的观察结果进一步得到了时间分辨PL测量结果的补充，该结果证实了伪自旋弛豫时间约为25 ps，明显短于先前报道的机械剥离样品的≈100 ps。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Solid State Communications 物理-物理：凝聚态物理

CiteScore

3.40

自引率

4.80%

发文量

287

审稿时长

51 days

期刊介绍： Solid State Communications is an international medium for the publication of short communications and original research articles on significant developments in condensed matter science, giving scientists immediate access to important, recently completed work. The journal publishes original experimental and theoretical research on the physical and chemical properties of solids and other condensed systems and also on their preparation. The submission of manuscripts reporting research on the basic physics of materials science and devices, as well as of state-of-the-art microstructures and nanostructures, is encouraged. A coherent quantitative treatment emphasizing new physics is expected rather than a simple accumulation of experimental data. Consistent with these aims, the short communications should be kept concise and short, usually not longer than six printed pages. The number of figures and tables should also be kept to a minimum. Solid State Communications now also welcomes original research articles without length restrictions. The Fast-Track section of Solid State Communications is the venue for very rapid publication of short communications on significant developments in condensed matter science. The goal is to offer the broad condensed matter community quick and immediate access to publish recently completed papers in research areas that are rapidly evolving and in which there are developments with great potential impact.