Scrutinizing the Debye plasma model: Rydberg excitons unravel the properties of low-density plasmas in semiconductors
Scrutinizing the Debye plasma model: Rydberg excitons unravel the properties of low-density plasmas in semiconductors
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仔细研究德拜等离子体模型：里德伯激子揭示了半导体中低密度等离子体的特性
DOI：
10.1103/physrevb.105.075204
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发表时间：
2021
影响因子：
3.7
通讯作者：
M. Bayer
中科院分区：
文献类型：
--
作者：
H. Stolz;D. Semkat;R. Schwartz;J. Heckötter;M. Assmann;W. Kraeft;H. Fehske;M. Bayer
对于低密度等离子体，德拜-胡克尔理论所描述的经典极限仍然被认为是一个合适的描述，尽管由于在确定原子系统中等离子体诱导的单粒子能量移动方面的问题，这一模式缺乏明确的实验证明。我们发现，处于高主量子数态的里德堡激子是对周围环境高度敏感的探测器，这使得精确地揭示低密度非简并电子-空穴等离子体的基本性质成为可能。为此，我们精确地测量了光学产生电子-空穴等离子体的块状氧化亚铜晶体吸收光谱中里德堡激子的能量和线宽等参数。由于从吸收光谱可以直接得到激子能量，以及由能带边给出的单粒子能量的移动，测量允许我们独立地确定等离子体密度和温度，这一直是半导体物理中出了名的难题。我们的分析毫不含糊地表明，等离子体的影响不能用经典的德拜模型来描述，而需要一个量子多体理论，不仅是对这里研究的半导体等离子体，而且是一般的。此外，它揭示了一种新的激子散射机制，即使在很低的等离子体密度下，耦合的等离子体声子模也变得重要。
For low-density plasmas, the classical limit described by the Debye-Hückel theory is still considered as an appropriate description even though a clear experimental proof of this paradigm is lacking due to the problems in determining the plasma-induced shift of single-particle energies in atomic systems. We show that Rydberg excitons in states with a high principal quantum number are highly sensitive probes for their surrounding making it possible to unravel accurately the basic properties of low-density non-degenerate electron-hole plasmas. To this end, we accurately measure the parameters of Rydberg excitons such as energies and linewidths in absorption spectra of bulk cuprous oxide crystals in which a tailored electron-hole plasma has been generated optically. Since from the absorption spectra exciton energies, as well as the shift of the single-particle energies given by the band edge, can be directly derived, the measurements allow us to determine the plasma density and temperature independently, which has been a notoriously hard problem in semiconductor physics. Our analysis shows unambiguously that the impact of the plasma cannot be described by the classical Debye model, but requires a quantum many-body theory, not only for the semiconductor plasma investigated here, but in general. Furthermore, it reveals a new exciton scattering mechanism with coupled plasmon-phonon modes becoming important even at very low plasma densities.
影响因子：
2.4
作者：
Lin, Chengliang;Roepke, Gerd;Reinholz, Heidi
通讯作者：
Reinholz, Heidi
氧化亚铜中里德伯激子透射谱的相干传输矩阵分析
影响因子：
3.7
作者：
Heinrich Stolz;Rico Schwartz;Julian Heckötter;Marc Aßmann;Dirk Semkat;Sjard O. Krüger;Manfred Bayer
通讯作者：
Manfred Bayer
影响因子：
64.8
作者：
Kazimierczuk, T.;Froehlich, D.;Bayer, M.
通讯作者：
Bayer, M.