Confined carbyne for optoelectronics and optomechanics

用于光电子学和光机械学的受限碳炔

• 批准号: 433878606
• 负责人: Dr. Sebastian Heeg
• 金额: --
• 依托单位: Fakultät für Physik
• 依托单位国家: 德国
• 项目类别: Independent Junior Research Groups
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/433878606?language=en
• 关键词: Confined; carbyne; optoelectronics; optomechanics

This project will establish carbyne, a one-dimensional linear chain of carbon atoms inside a carbon nanotube, as a new material system to manipulate the molecular vibrations through optomechanical interaction, and to realize a transistor on the atomic scale. I will exploit two unique properties of carbyne that arise directly from its atomic structure. Carbyne is a Peierls material which exists in a metallic phase where the atoms are connected by double bonds, and in a semiconducting phase with alternating single and triple bonds. Carbyne can be switched between the two phases by doping, which will allow me to use carbyne as a transistor channel where the current flow is controlled by changing the structural phase of carbyne. This enables a nanoscale transistor at the absolute lower size limit with a channel cross section of one atom, and differs radically from conventional transistor architectures where the current flow is controlled by doping a semiconductor. Recent theoretical works suggest to manipulate molecular vibrations (phonons) through the optomechanical interaction of a molecule with the intense light fields of a plasmonic nanostructure. This transfers the concept of optomechanical interaction between a macroscopic resonator and an optical cavity to the molecular scale, and predicts million-fold stronger optomechanical coupling rates. Phonons can then act as information carriers and allow for the study of quantum-mechanical effects in optomechanics. Current experimental realizations, however, fail due to molecular disintegration driven by the strong light fields generated by the plasmonic structures. Here, I suggest to overcome this limitation by exploiting the exceptionally high Raman scattering cross section of carbyne, the rate at which molecular vibrations are scattering inelastically by light. This reduces the field intensities required to enter the regime of optomechanical interaction and will allow me to prepare non-thermal phonon populations in carbyne. Phonon lasing and the emission of correlated photons as two of the intriguing consequences of molecular optomechanical interaction will be demonstrated.The project initially aims at exploring the phonon and excitation dynamics of confined carbyne and how these properties are influenced by the host nanotubes. I will achieve this by combining tip-enhanced, temperature-, and wavelength dependent Raman spectroscopy. Confined carbyne will be brought into a device configuration and interfaced with plasmonic structures by dielectrophoretic deposition, where the nanotube acts as a carrier system. Electrical transport measurements will verify the functionality of the carbyne transistor. The proposed project establishes confined carbyne as a new material system to study molecular optomechanics and will allow me to explore new phenomena such as the frequency conversion of light on the molecular scale.

该项目将建立碳原子在碳纳米管内的一维线性碳链，作为一种新的材料系统，通过光机相互作用来操纵分子的振动，并实现原子尺度上的晶体管。我将利用卡宾的两个独特性质，这两个性质直接来自于它的原子结构。卡宾是一种Peierls材料，存在于原子通过双键连接的金属相中，以及以单键和三键交替存在的半导体相中。卡宾可以通过掺杂在两个相之间切换，这将允许我将卡宾用作晶体管通道，其中通过改变卡宾的结构相来控制电流流动。这使得纳米级晶体管能够以一个原子的沟道截面以绝对较低的尺寸限制，并且与通过掺杂半导体来控制电流的传统晶体管体系结构有根本的不同。最近的理论工作表明，通过分子与等离子体纳米结构的强光场的光机械相互作用来操纵分子振动(声子)。这将宏观谐振器和光学腔之间的光学机械相互作用的概念转移到分子尺度，并预测了更强的光学机械耦合率数百万倍。然后，声子可以作为信息载体，并允许研究光力学中的量子力学效应。然而，由于等离子体结构产生的强光场驱动的分子解体，目前的实验实现失败了。在这里，我建议通过利用卡宾的极高的拉曼散射截面来克服这一限制，卡宾的拉曼散射截面是分子振动被光非弹性散射的速率。这降低了进入光机械相互作用机制所需的场强，并将使我能够在卡宾中制备非热声子群。声子激光和关联光子的发射是分子光机相互作用的两个有趣的结果。该项目最初的目的是探索受限卡宾的声子和激发动力学，以及这些性质是如何受到宿主纳米管的影响的。我将通过结合尖端增强拉曼光谱、温度依赖拉曼光谱和波长依赖拉曼光谱来实现这一点。受限的卡宾将被带入器件配置中，并通过介电沉积与等离子体结构连接，其中纳米管充当载体系统。电气传输测量将验证卡宾晶体管的功能。拟议的项目建立了受限卡宾作为一种新的材料系统来研究分子光学机械，并将使我能够在分子尺度上探索新的现象，如光的频率转换。