Ultrafast lattice and electronic dynamics in single-walled carbon nanotubes

Abstract

Understanding the photoinduced ultrafast structural transitions and electronic dynamics in single-walled carbon nanotubes (SWCNTs) is important for the development of SWCNT-based optoelectronic devices.

Enhancement of lattice dynamics by an azimuthal surface plasmon on the femtosecond time scale in multi-walled carbon nanotubes

“…In our previous investigations, we have extensively studied the fundamental structural properties and dynamic evolution of CNTs with random tube orientation over a long-time scale, from nonthermal transitions on a fs time scale to phonondriven thermal expansion in a few picoseconds, to thermal diffusion on a microsecond time scale. [21][22][23] In this work, we obtained the temporal changes of the lattice structure of wellaligned CNTs under different optical polarizations by measuring ultrafast stroboscopic diffraction patterns. The temporal changes in the interlayer spacing (Δd/d 0 ), shown in Fig.…”

Accelerating Quantum Materials Development with Advances in Transmission Electron Microscopy

“…Time-resolved TEM can be considered as a direct extension of conventional TEM with expanded capabilities into the time domain, allowing for analysis of ultrafast structural dynamics and transformations with sub-nm spatial resolution and ps-fs time scale. − ,− Time-resolved TEM enables the identification of intermediate states that occur during complex transitions thereby providing the basis for a solid understanding of fast dynamics, e.g., the displacement of atoms and formation of individual structural point defects through irreversible atomic-bond breakages . “Exactly like someone would ask a magician to slow down his movements and break them into a sequence of elementary gestures to understand a card trick, electron microscopists have long dreamed of being able to excite samples and acquire images, diffraction patterns, or energy spectra after a controllable delay to elucidate their dynamics.”–Arnaud Arbouet, Giuseppe M. Caruso, Florent Houdellier .…”

Capturing the non-equilibrium state in light–matter–free-electron interactions through ultrafast transmission electron microscopy

“…Time-resolved lowloss EELS has been adopted to reveal the electronic dynamics in graphite, [81,82] layered manganite, [83] and single-wall carbon nanotubes. [84] Considering the picosecond time scale investigated in these studies, the dynamics of chemical bonding and orbital charge are closely related to the photon-induced 010701-5 transient structural transformations in the materials.…”

“…[82] The similar technique has been used to uncover the dynamics in one-dimensional materials, such as single-wall carbon nanotubes, in which electron-driven and phonondriven lattice expansions on different time scales are distinguished. [84] To clarify the origin of a 0.18% lattice expansion with a time constant of 1.4 ps and lattice expansion of 0.15% with a time constant of 17.4 ps measured from ultrafast electron diffraction, the dynamics of the π plasmon and π + σ plasmon were investigated by Zheng et al, as presented in Figs. 4(b)-4(e).…”