Chirality-dependent frequency shift of radial breathing mode in metallic carbon nanotubes
نویسندگان
چکیده
Ken-ichi Sasaki,1 Riichiro Saito,1 Gene Dresselhaus,2 Mildred S. Dresselhaus,3,4 Hootan Farhat,5 and Jing Kong4 1Department of Physics, Tohoku University and CREST-JST, Sendai, 980-8578, Japan 2Francis Bitter Magnet Laboratory, Cambridge, Massachusetts 02139-4307, USA 3Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA 4Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA 5Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA Received 16 September 2008; revised manuscript received 3 November 2008; published 2 December 2008
منابع مشابه
Radial Breathing Mode Frequency of Multi-Walled Carbon Nanotube Via Multiple-Elastic Thin Shell Theory
In this paper, the radial breathing mode (RBM) frequencies of multi-walled carbon nanotubes (MWCNTs) are obtained based on the multiple-elastic thin shell model. For this purpose, MWCNT is considered as a multiple concentric elastic thin cylindrical shells, which are coupled through van der Waals (vdW) forces between two adjacent tubes. Lennard-Jones potential is used to calculate the vdW ...
متن کاملCoupled Axial-Radial Vibration of Single-Walled Carbon Nanotubes Via Doublet Mechanics
This paper investigates the coupled axial-radial (CAR) vibration of single-walled carbon nanotubes (SWCNTs) based on doublet mechanics (DM) with a scale parameter. Two coupled forth order partial differential equations that govern the CAR vibration of SWCNTs are derived. It is the first time that DM is used to model the CAR vibration of SWCNTs. To obtain the natural frequency and dynamic respon...
متن کاملChirality distribution and transition energies of carbon nanotubes.
From resonant Raman scattering on isolated nanotubes we obtained the optical transition energies, the radial breathing mode frequency, and the Raman intensity of both metallic and semiconducting tubes. We unambiguously assigned the chiral index (n(1),n(2)) of approximately 50 nanotubes based solely on a third-neighbor tight-binding Kataura plot and find omega(RBM)=(214.4+/-2) cm(-1) nm/d+(18.7+...
متن کاملSoftening of the radial breathing mode in metallic carbon nanotubes.
The softening of the radial breathing mode (RBM) of metallic single walled carbon nanotubes (m-SWNTs) due to electron-phonon coupling has been studied by observing the Fermi level [see text] dependence of the RBM Raman peak. In situ Raman spectra were obtained from several individual m-SWNTs while varying [see text] electrochemically. The RBM frequency of an intrinsic m-SWNT is shown to be down...
متن کاملCoherent phonons in carbon nanotubes and graphene
We review recent studies of coherent phonons (CPs) corresponding to the radial breathing mode (RBM) and G-mode in single-wall carbon nanotubes (SWCNTs) and graphene. Because of the bandgap-diameter relationship, RBM-CPs cause bandgap oscillations in SWCNTs, modulating interband transitions at terahertz frequencies. Interband resonances enhance CP signals, allowing for chirality determination. U...
متن کامل