Journal
NATURE COMMUNICATIONS
Volume 4, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms2367
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Funding
- NSF [0846648, DMR10-1006184]
- NSF Centre for Integrated Nanomechanical Systems [EEC-0832819]
- DOE [DE-AC02-05CH11231]
- DOE Molecular Foundry [DE-AC02-05CH11231]
- MOST [2012CB933003]
- CAS [KJCX2-YW-M13, KJCX2-YW-W35]
- NSF of China [11027402, 91021007, 10974238, 20973195]
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Van der Waals-coupled materials, ranging from multilayers of graphene and MoS2 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 derWaals 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.
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