Towards quantum plasmonics: excitation of 2D plasmons via coupling with quantum dots and 2D materials

迈向量子等离子体：通过量子点和二维材料耦合激发二维等离子体

• 批准号: 509747664
• 负责人: Professor Dr. Christoph Tegenkamp
• 金额: --
• 依托单位: Professur Analytik an Festkörperoberflächen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/509747664?language=en
• 关键词: Towards; quantum; plasmonics; excitation; 2D

Towards quantum plasmonics: excitation of 2D plasmons via coupling with quantum dots and 2D materialsThe mutual interplay between photons and plasmon quasiparticles is used in the field of plasmonics to propagate information across surfaces, confine and guide light and use surface plasmon polaritons (SPP) for quantum computing. Collective excitations in low dimensional electron gases, so-called sheet plasmons, provide tunable energies and wavelengths from the THz to the optical regime on a truly nanometer scale, respectively, and are therefore promising. However, compared to the well-established field of SPPs, new concepts are mandatory in order to couple light and to excite sheet-plasmon-polariton quasiparticles.In this proposal, we will study the interaction of sheet plasmons of low dimensional electron gases coupled to other oscillators. Among others, metallic and semiconducting quantum dots (QDs), as well as 2D materials (TMDCs, molecular layers) are used to study plasmon-plasmon and plasmon-exciton excitations on a true nanometer scale. By means of epitaxial graphene, providing a quasi-perfect 2D electron gas system (2DEG), the different interaction schemes are studied in detail by both electron- and photon-assisted excitations. Moreover, the chemical flexibility of epitaxial graphene enable us to use various functionalization schemes, e.g., adsorption of QDs from the liquid phase, adsorption of molecules in vacuum, growth of 2D materials and intercalation of metals. Using high resolution electron energy loss spectroscopy and scanning near-field optical microscopy the coupling and amplification of plasmons is studied in reciprocal and real space. The experiments are supplemented by (multi-tip) scanning tunneling microscopy to control the atomic scale, charge transfer and perform opto-electronic energy conversion experiments on the nanoscale.

迈向量子等离子体激元：通过与量子点和 2D 材料耦合激发 2D 等离子体激元光子和等离子体激元准粒子之间的相互作用在等离子体激元领域中用于跨表面传播信息、限制和引导光以及使用表面等离子体激元 (SPP) 进行量子计算。低维电子气中的集体激发，即所谓的片状等离子体，分别提供从太赫兹到真正纳米尺度的光学范围的可调谐能量和波长，因此很有前景。然而，与成熟的SPP领域相比，为了耦合光和激发片状等离子体激元准粒子，新的概念是强制性的。在本提案中，我们将研究低维电子气的片状等离子体激元与其他振荡器耦合的相互作用。其中，金属和半导体量子点 (QD) 以及 2D 材料（TMDC、分子层）用于研究真正纳米尺度的等离激元-等离激元和等离激元-激子激发。通过外延石墨烯提供准完美的二维电子气系统（2DEG），通过电子和光子辅助激发详细研究了不同的相互作用方案。此外，外延石墨烯的化学灵活性使我们能够使用各种功能化方案，例如从液相中吸附量子点、在真空中吸附分子、二维材料的生长和金属插层。使用高分辨率电子能量损失光谱和扫描近场光学显微镜，研究了倒易空间和实空间中的等离子体激元的耦合和放大。这些实验辅以（多尖端）扫描隧道显微镜来控制原子尺度、电荷转移并在纳米尺度上进行光电能量转换实验。