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arXiv 2102.08989cond-mat.mes-hallcond-mat.quant-gas
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利用电场和激子-电荷相互作用实现中性激子的可调量子限制

Tunable quantum confinement of neutral excitons using electric fields and exciton-charge interactions

Deepankur Thureja, Atac Imamoglu, Tomasz Smolenski, Alexander Popert, Thibault Chervy, Xiaobo Lu, Song Liu, Katayun Barmak, Kenji Watanabe, Takashi Taniguchi, D… 展开作者

Deepankur Thureja, Atac Imamoglu, Tomasz Smolenski, Alexander Popert, Thibault Chervy, Xiaobo Lu, Song Liu, Katayun Barmak, Kenji Watanabe, Takashi Taniguchi, David J. Norris, Martin Kroner, Puneet A. Murthy

摘要:

量子限制是当粒子的运动被限制在小于它们的德布罗意波长的长度尺度时能量的离散化。这种效应的实验实现在物理学的各个领域产生了广泛的影响,并促进了新技术的发展。在半导体物理学中,光激发准粒子(如激子或三电子)的量子限制通常是通过调制材料特性来实现的,这种方法受到限制势的原位可调性和可扩展性的严重限制。因此,实现光激发的完全可调谐量子限制一直是量子光子学的突出目标。在这里,我们证明了电控制的量子限制的中性激子在栅极定义的单层p-i-n二极管。由大的面内场和以前未知的限制机制的基础上激子和自由电荷之间的排斥相互作用的直流斯塔克位移的组合,确保严格的激子限制在狭窄的中性区域。激子运动的量子化表现在自由激子共振以下出现的多个离散的、光谱窄的、依赖于电压的光学共振中。我们的测量结果揭示了这些量子限制激子的一些独特的物理特征,包括面内偶极特性,一维质心限制,以及在磁场存在下激子尺寸的显著增强。我们的方法提供了一个实验路线,创造可扩展的阵列相同的单光子源,这将构成强相关的光子系统的积木。

英文摘要:

Quantum confinement is the discretization of energy when motion of particles is restricted to length scales smaller than their de Broglie wavelength. The experimental realization of this effect has had wide ranging impact in diverse fields of physics and facilitated the development of new technologies. In semiconductor physics, quantum confinement of optically excited quasiparticles, such as excitons or trions, is typically achieved by modulation of material properties - an approach crucially limited by the lack of insitu tunability and scalability of confining potentials. Achieving fully tunable quantum confinement of optical excitations has therefore been an outstanding goal in quantum photonics. Here, we demonstrate electrically controlled quantum confinement of neutral excitons in a gate-defined monolayer p-i-n diode. A combination of dc Stark shift induced by large in-plane fields and a previously unknown confining mechanism based on repulsive interaction between excitons and free charges ensures tight exciton confinement in the narrow neutral region. Quantization of exciton motion manifests in multiple discrete, spectrally narrow, voltage-dependent optical resonances that emerge below the free exciton resonance. Our measurements reveal several unique physical features of these quantum confined excitons, including an in-plane dipolar character, one-dimensional center-of-mass confinement, and strikingly enhanced exciton size in the presence of magnetic fields. Our method provides an experimental route towards creating scalable arrays of identical single photon sources, which will constitute building blocks of strongly correlated photonic systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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