Document Detail

Quantum-coupled radial-breathing oscillations in double-walled carbon nanotubes.
MedLine Citation:
PMID:  23340415     Owner:  NLM     Status:  In-Data-Review    
Van der Waals-coupled materials, ranging from multilayers of graphene and MoS(2) to superlattices of nanoparticles, exhibit rich emerging behaviour owing to quantum coupling between individual nanoscale constituents. Double-walled carbon nanotubes provide a model system for studying such quantum coupling mediated by van der Waals interactions, because each constituent single-walled nanotube can have distinctly different physical structures and electronic properties. Here we systematically investigate quantum-coupled radial-breathing mode oscillations in chirality-defined double-walled nanotubes by combining simultaneous structural, electronic and vibrational characterizations on the same individual nanotubes. We show that these radial-breathing oscillations are collective modes characterized by concerted inner- and outer-wall motions, and determine quantitatively the tube-dependent van der Waals potential governing their vibration frequencies. We also observe strong quantum interference between Raman scattering from the inner- and outer-wall excitation pathways, the relative phase of which reveals chirality-dependent excited-state potential energy surface displacement in different nanotubes.
Kaihui Liu; Xiaoping Hong; Muhong Wu; Fajun Xiao; Wenlong Wang; Xuedong Bai; Joel W Ager; Shaul Aloni; Alex Zettl; Enge Wang; Feng Wang
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature communications     Volume:  4     ISSN:  2041-1723     ISO Abbreviation:  Nat Commun     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101528555     Medline TA:  Nat Commun     Country:  England    
Other Details:
Languages:  eng     Pagination:  1375     Citation Subset:  IM    
1] Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA [2] Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
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