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M. Souza

Universidade Federal de Minas Gerais

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Featured researches published by M. Souza.

ELECTRONIC PROPERTIES OF NOVEL NANOSTRUCTURES: XIX International Winterschool/Euroconference on Electronic Properties of Novel Materials | 2005

Intermediate Frequency Raman Modes in Metallic and Semiconducting Carbon Nanotubes

C. Fantini; A. Jorio; M. Souza; Riichiro Saito; Ge. G. Samsonidze; M. S. Dresselhaus; M. A. Pimenta

Resonance Raman spectra of bundled and isolated single‐wall carbon nanotubes (SWNTs) have been investigated in the spectral range between 600 and 1100 cm−1, associated with intermediate frequency modes (IFM). The IFMs have been poorly studied before despite the rich set of spectral features and their relation to defects and finite size effects in SWNTs. Different kinds of samples and many laser excitation energies (Elaser) have been used in the experiments. The differences in the IFM spectra for different SWNT samples are discussed, and from a line‐shape analysis of the spectra we get an (n,m) assignment based on IFM features.

MOLECULAR NANOSTRUCTURES: XVII International Winterschool Euroconference on Electronic Properties of Novel Materials | 2003

Dispersive Bands in Graphite and Carbon Nanotubes

A. Jorio; M. A. Pimenta; M. Souza; C. Fantini; Ge. G. Samsonidze; G. Dresselhaus; M. S. Dresselhaus; A. G. Souza Filho; Riichiro Saito

Dispersive features observed in graphite, carbon nanotube bundles and isolated single‐wall carbon nanotubes are discussed. Special attention is given to the effects of the van Hove singularities in 1D nanotubes.

Physical Review B | 2005

Quantifying carbon-nanotube species with resonance Raman scattering

A. Jorio; A. P. Santos; H.B. Ribeiro; C. Fantini; M. Souza; J. P. M. Vieira; Clascídia A. Furtado; J. Jiang; Riichiro Saito; Leandro Balzano; Daniel E. Resasco; M. A. Pimenta

Carbon | 2005

Origin of the 2450 cm−1 Raman bands in HOPG, single-wall and double-wall carbon nanotubes

Takashi Shimada; Toshiki Sugai; C. Fantini; M. Souza; Luiz Gustavo Cançado; A. Jorio; M. A. Pimenta; Riichiro Saito; A. Grüneis; G. Dresselhaus; M. S. Dresselhaus; Yutaka Ohno; Takashi Mizutani; Hisanori Shinohara

Physical Review Letters | 2004

One-Dimensional Character of Combination Modes in the Resonance Raman Scattering of Carbon Nanotubes

C. Fantini; A. Jorio; M. Souza; Luiz O. Ladeira; A. G. Souza Filho; Riichiro Saito; Ge. G. Samsonidze; G. Dresselhaus; M. S. Dresselhaus; M. A. Pimenta

Physical Review B | 2005

Steplike dispersion of the intermediate-frequency Raman modes in semiconducting and metallic carbon nanotubes

C. Fantini; A. Jorio; M. Souza; Riichiro Saito; Ge. G. Samsonidze; M. S. Dresselhaus; M. A. Pimenta

Physical Review B | 2004

Single- and double-resonance Raman G -band processes in carbon nanotubes

M. Souza; A. Jorio; C. Fantini; B. R. A. Neves; M. A. Pimenta; Riichiro Saito; A. Ismach; Ernesto Joselevich; Victor W. Brar; Ge. G. Samsonidze; G. Dresselhaus; M. S. Dresselhaus

Carbon | 2004

Advances in single nanotube spectroscopy: Raman spectra from cross-polarized light and chirality dependence of Raman frequencies

A. Jorio; M. A. Pimenta; C. Fantini; M. Souza; A. G. Souza Filho; Ge. G. Samsonidze; G. Dresselhaus; M. S. Dresselhaus; Riichiro Saito

Bulletin of the American Physical Society | 2005

Microscopic and spectroscopic studies of the surfactant-assisted dispersion process of CoMoCAT carbon nanotubes in water

Adelina P. Santos; Douglas Alves; Valdirene Peressinotto; Clascídia A. Furtado; M. Souza; F. Plentz; Henrique B. Ribeiro; A. Jorio; M. A. Pimenta; Daniel Resasco

Bulletin of the American Physical Society | 2005