强径向约束电子-空穴几体系统中粒子间相关性的 Floquet 工程。

IF 2.3 4区 物理与天体物理 Q3 PHYSICS, CONDENSED MATTER
G Dziembaj, T Chwiej
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引用次数: 0

摘要

我们研究了非共振太赫兹频率激光耦合到束缚少体电子-空穴系统(即限制在量子线中的激子和带负电的三电子)的效应。为了解决这个问题,我们首先对哈密尔顿进行了单元亨纳伯格-克拉默斯变换,并将其微扰近似对角化,从而得到了激子和三离子的弗洛克特态。在此框架内,光-物质耦合重规范化了吸引力$eh$相互作用,而排斥力$ee$则保持不变,从而改变了相应的双粒子相关能。一般来说,对于具有强局域重空穴的半导体材料,$eh$ 的相关能会超过$ee$ 的相关能。然而,随着激光强度的增加,前者的相关能会减弱,这种关系可能会逆转。因此,三元子可能会发生非正常解离,空穴会逐渐与仍有强相互作用的电子脱钩,而伴随这一过程的是适当的能量和光学光谱变化。激子和三元子 Floquet 状态的能级会升高,而它们的光学亮度在激光强度较强的情况下会平滑下降。我们还展示了用静态电场打破金属丝的镜面对称性可以进一步改变这一过程,然后三元子最低能级之间避免交叉的发生取决于激光强度。我们将在实验中观察到这些反交叉现象,从而证实弗洛凯工程对于在亚皮秒时间尺度上快速操纵电子-空穴系统中的少粒子状态非常有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Floquet engineering of interparticle correlations in electron-hole few-body system for strong radial confinement.

We investigate the effects of off-resonant THz-frequency laser light coupling to bound few-body electron-hole system, i.e. the exciton and negatively charged trion confined in quantum wire. To solve this problem, we first conduct a unitary Hennerberger-Kramers transformation of the Hamiltonian and diagonalize its perturbative approximation to obtain the exciton and trion Floquet states. Within this framework, the light-matter coupling renormalizes an attractiveehinteraction, leaving the repulsiveeeunchanged, thus modifying corresponding two-particle correlation energies. Generally, the correlation energy ofehwould exceed theeeone for a semiconductor material with strongly localized heavy holes. However, as the former is weakened by increasing laser intensity, this relation can be reversed. Consequently, the trion may dissociate unconventionally, the hole gradually decouples from still strongly interacting electrons, and adequate energy and optical spectra changes accompany this process. The energy levels of the exciton and trion Floquet states are raised, while their optical brightness smoothly decreases for stronger laser intensities. We also show this process can be further modified by breaking the mirror symmetry of wire with a static electric field, and then the occurrence of the avoided crossings between the lowest energy levels of the trion depends on the laser intensity. These anticrossings shall be observed experimentally, confirming thus the usefulness of Floquet engineering for fast manipulations of the few-particle states in electron-hole systems on a subpicosecond time scale.

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来源期刊
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter 物理-物理:凝聚态物理
CiteScore
5.30
自引率
7.40%
发文量
1288
审稿时长
2.1 months
期刊介绍: Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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