Ultrafast spectroscopy of 1D nanomaterials and their applications
Maria G. Burdanova 1,2,3;
1 - Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
2 - Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
3 - Institute of Solid State Physics of the Russian Academy of Sciences, Russia
Abstract
The existing and continuously growing THz technologies demand compact, fast, broadband high-performance devices. One-dimensional (1D) nanomaterials hold high potential for the implementation of efficient THz optoelectronics. By focusing on these applications, it is important to characterize the nature and dynamics of photoexcited states in these materials. By employing optical pump – Terahertz (THz) probe spectroscopy, ultrafast photocarrier dynamics can be accessed. Therefore, we systematically studied the range of 1D nanomaterials such as carbon nanotubes (CNT), boron nitrate nanotubes (BNNT), MoS2 nanotubes (MoS2 NT), WS2 nanotubes (WS2 NT) and their heterostructures. These materials have a unique terahertz photoconductivity that can be changed from anomalous (positive ΔT/T, negative photoconductivity) to natural (positive photoconductivity) due to mobile free charges with charge carrier mobility comparable to their 2D counterparts. In addition, the presence of excitons and their dynamics in a given rarity when measured by the pump-probe method. Thus, in our work, we show the coexistence of charge carriers and excitons in these structures. Such unique properties can be used in a wide range of applications.
Speaker
Maria Burdanova
MIPT, PGPIRAS, ISSPRAS
Russia
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