Quantum Interference between the Third and Fourth Exciton States in Semiconducting Carbon Nanotubes Using Resonance Raman Spectroscopy

Juan G. Duque, Hagen Telg, Hang Chen, Anna K. Swan, Andrew P. Shreve, Xiaomin Tu, Ming Zheng, and Stephen K. Doorn
Phys. Rev. Lett. 108, 117404 – Published 16 March 2012
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Abstract

We exploit an energy level crossover effect [Haroz et al., Phys. Rev. B 77, 125405 (2008)] to probe quantum interference in the resonance Raman response from carbon nanotube samples highly enriched in the single semiconducting chiralities of (8,6), (9,4), and (10,5). UV Raman excitation profiles of G-band spectra reveal unambiguous signatures of interference between the third and fourth excitonic states (E33 and E44). Both constructive and destructive responses are observed and lead to anomalous intensity ratios in the LO and TO modes. Especially large anomalies for the (10,5) structure result from nearly identical energies found for the two Eii transitions. The interference patterns demonstrate that the sign of the exciton-phonon coupling matrix elements changes for the LO mode between the two electronic states, and remains the same for the TO mode. Significant non-Condon contributions to the Raman response are also found.

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  • Received 19 September 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.117404

© 2012 American Physical Society

Authors & Affiliations

Juan G. Duque1,2, Hagen Telg1, Hang Chen3, Anna K. Swan3, Andrew P. Shreve1,4, Xiaomin Tu5, Ming Zheng5, and Stephen K. Doorn1,*

  • 1Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 2Physical Chemistry and Applied Spectroscopy Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 3Department of Electrical and Computer Engineering, and Photonics Center, Boston University, Boston, Massachusetts 02215, USA
  • 4Center for Biomedical Engineering and Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA
  • 5Polymers Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899-8540, USA

  • *Author to whom all correspondence should be addressed. skdoorn@lanl.gov

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Issue

Vol. 108, Iss. 11 — 16 March 2012

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